51
|
The ansa peduncularis in the human brain: A tractography and fiber dissection study. Brain Res 2020; 1746:146978. [PMID: 32535175 DOI: 10.1016/j.brainres.2020.146978] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Revised: 06/08/2020] [Accepted: 06/09/2020] [Indexed: 11/21/2022]
Abstract
INTRODUCTION The ansa peduncularis is a composite of white matter fiber bundles closely packed together that sweeps around the cerebral peduncle. The exact components of the ansa peduncularis and their anatomical trajectories are still not established firmly in the literature. OBJECTIVE The aim of this study was to examine the topographical anatomy of the ansa peduncularis and its subcomponents using the fiber dissection and tractography techniques. METHODS Ten formalin-fixed brains were prepared according to Klingler's method and dissected by the fiber dissection technique from the lateral, medial and inferior surfaces. The ansa peduncularis was also traced using high definition fiber tracking (HDFT) from the MRI data of twenty healthy adults and a 1021-subject template from the Human Connectome Project. RESULTS The ventral amygdalofugal pathway system includes white matter fiber bundles with a topographically close relation as they sweep around the cerebral peduncle and contribute to form the ansa peduncularis: amygdaloseptal fibers connect the amygdala and anterior temporal cortex to the septal region and amygdalohypothalamic fibers project from the amygdala to the hypothalamus. Additionally, from the amygdala and anterior temporal cortex, amygdalothalamic fibers project to the medial thalamic region. The ansa lenticularis, which connects the globus pallidus to the thalamus, was not shown in our study. CONCLUSION The study demonstrated the trajectory of the ansa peduncularis and its subcomponents, based on fiber dissection and tractography, improving our understanding of human brain anatomical connectivity.
Collapse
|
52
|
Jordan KM, Keshavan A, Caverzasi E, Osorio J, Papinutto N, Amirbekian B, Berger MS, Henry RG. Longitudinal Disconnection Tractograms to Investigate the Functional Consequences of White Matter Damage: An Automated Pipeline. J Neuroimaging 2020; 30:443-457. [PMID: 32436352 DOI: 10.1111/jon.12713] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Accepted: 03/27/2020] [Indexed: 11/28/2022] Open
Abstract
BACKGROUND AND PURPOSE Neurosurgical resection is one of the few opportunities researchers have to image the human brain pre- and postfocal damage. A major challenge associated with brains undergoing surgical resection is that they often do not fit brain templates most image-processing methodologies are based on. Manual intervention is required to reconcile the pathology, requiring time investment and introducing reproducibility concerns, and extreme cases must be excluded. METHODS We propose an automatic longitudinal pipeline based on High Angular Resolution Diffusion Imaging acquisitions to facilitate a Pathway Lesion Symptom Mapping analysis relating focal white matter injury to functional deficits. This two-part approach includes (i) automatic segmentation of focal white matter injury from anisotropic power differences, and (ii) modeling disconnection using tractography on the single-subject level, which specifically identifies the disconnections associated with focal white matter damage. RESULTS The advantages of this approach stem from (1) objective and automatic lesion segmentation and tractogram generation, (2) objective and precise segmentation of affected tissue likely to be associated with damage to long-range white matter pathways (defined by anisotropic power), (3) good performance even in the cases of anatomical distortions by use of nonlinear tensor-based registration, which aligns images using an approach sensitive to white matter microstructure. CONCLUSIONS Mapping a system as variable and complex as the human brain requires sample sizes much larger than the current technology can support. This pipeline can be used to execute large-scale, sufficiently powered analyses by meeting the need for an automatic approach to objectively quantify white matter disconnection.
Collapse
Affiliation(s)
- Kesshi M Jordan
- UCSF-UC Berkeley Graduate Group in Bioengineering, San Francisco, CA.,Department of Neurology, University of California, San Francisco, CA
| | - Anisha Keshavan
- UCSF-UC Berkeley Graduate Group in Bioengineering, San Francisco, CA.,Department of Neurology, University of California, San Francisco, CA
| | - Eduardo Caverzasi
- Department of Neurology, University of California, San Francisco, CA
| | - Joseph Osorio
- Division of Neurosurgery, Department of Surgery, University of California, San Diego, CA
| | - Nico Papinutto
- Department of Neurology, University of California, San Francisco, CA
| | - Bagrat Amirbekian
- UCSF-UC Berkeley Graduate Group in Bioengineering, San Francisco, CA.,Department of Neurology, University of California, San Francisco, CA
| | - Mitchel S Berger
- Department of Neurosurgery, University of California, San Francisco, CA
| | - Roland G Henry
- UCSF-UC Berkeley Graduate Group in Bioengineering, San Francisco, CA.,Department of Neurology, University of California, San Francisco, CA.,Department of Radiology and Biomedical Imaging, University of California, San Francisco, CA
| |
Collapse
|
53
|
Vanderweyen DC, Theaud G, Sidhu J, Rheault F, Sarubbo S, Descoteaux M, Fortin D. The role of diffusion tractography in refining glial tumor resection. Brain Struct Funct 2020; 225:1413-1436. [PMID: 32180019 DOI: 10.1007/s00429-020-02056-z] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2019] [Accepted: 02/28/2020] [Indexed: 12/14/2022]
Abstract
Primary brain tumors are notoriously hard to resect surgically. Due to their infiltrative nature, finding the optimal resection boundary without damaging healthy tissue can be challenging. One potential tool to help make this decision is diffusion-weighted magnetic resonance imaging (dMRI) tractography. dMRI exploits the diffusion of water molecule along axons to generate a 3D modelization of the white matter bundles in the brain. This feature is particularly useful to visualize how a tumor affects its surrounding white matter and plan a surgical path. This paper reviews the different ways in which dMRI can be used to improve brain tumor resection, its benefits and also its limitations. We expose surgical tools that can be paired with dMRI to improve its impact on surgical outcome, such as loading the 3D tractography in the neuronavigation system and direct electrical stimulation to validate the position of the white matter bundles of interest. We also review articles validating dMRI findings using other anatomical investigation techniques, such as postmortem dissections, manganese-enhanced MRI, electrophysiological stimulations, and phantom studies with known ground truth. We will be discussing the areas of the brain where dMRI performs well and where the future challenges are. We will conclude this review with suggestions and take home messages for neurosurgeons, tractographers, and vendors for advancing the field and on how to benefit from tractography's use in clinical practice.
Collapse
Affiliation(s)
- Davy Charles Vanderweyen
- Department of Surgery, Division of Neurosurgery, Faculty of Medicine, University of Sherbrooke, 3001 12 Ave N, Sherbrooke, QC, J1H 5H3, Canada.
| | - Guillaume Theaud
- Sherbrooke Connectivity Imaging Lab (SCIL), Computer Science Department, University of Sherbrooke, 2500 Boulevard Université, Sherbrooke, QC, J1K2R1, Canada
| | - Jasmeen Sidhu
- Sherbrooke Connectivity Imaging Lab (SCIL), Computer Science Department, University of Sherbrooke, 2500 Boulevard Université, Sherbrooke, QC, J1K2R1, Canada
| | - François Rheault
- Sherbrooke Connectivity Imaging Lab (SCIL), Computer Science Department, University of Sherbrooke, 2500 Boulevard Université, Sherbrooke, QC, J1K2R1, Canada
| | - Silvio Sarubbo
- Division of Neurosurgery, Emergency Area, Structural and Functional Connectivity Lab Project, "S. Chiara" Hospital, Azienda Provinciale Per I Servizi Sanitari (APSS), Trento, Italy
| | - Maxime Descoteaux
- Sherbrooke Connectivity Imaging Lab (SCIL), Computer Science Department, University of Sherbrooke, 2500 Boulevard Université, Sherbrooke, QC, J1K2R1, Canada
| | - David Fortin
- Department of Surgery, Division of Neurosurgery, Faculty of Medicine, University of Sherbrooke, 3001 12 Ave N, Sherbrooke, QC, J1H 5H3, Canada
| |
Collapse
|
54
|
Chernoff BL, Teghipco A, Garcea FE, Belkhir R, Sims MH, Paul DA, Tivarus ME, Smith SO, Hintz E, Pilcher WH, Mahon BZ. Reorganized language network connectivity after left arcuate fasciculus resection: A case study. Cortex 2020; 123:173-184. [PMID: 31812105 DOI: 10.1016/j.cortex.2019.07.022] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Revised: 02/18/2019] [Accepted: 07/02/2019] [Indexed: 01/07/2023]
Abstract
Understanding the neural mechanisms that support spontaneous recovery of cognitive abilities can place important constraints on mechanistic theories of brain organization and function, and holds potential to inform clinical interventions. Connectivity-based MRI measures have emerged as a way to study how recovery from brain injury is modulated by changes in intra- and inter-hemispheric connectivity. Here we report a detailed and multi-modal case study of a 26 year-old male who presented with a left inferior parietal glioma infiltrating the left arcuate fasciculus. The patient underwent pre- and post-operative functional MRI and Diffusion Tensor Imaging, as well as behavioral assessments of language, motor, vision and praxis. The surgery for removal of the tumor was carried out with the patient awake, and direct electrical stimulation mapping was used to evaluate cortical language centers. The patient developed a specific difficulty with repeating sentences toward the end of the surgery, after resection of the tumor and partial transection of the arcuate fasciculus. The patient recovered from the sentence repetition impairments over several months after the operation. Coincident with the patient's cognitive recovery, we document a pattern whereby intra-hemispheric functional connectivity was reduced in the left hemisphere, while inter-hemispheric connectivity increased between classic left hemisphere language regions and their right hemisphere homologues. These findings suggest that increased synchrony between the two hemispheres, in the setting of focal transection of the left arcuate fasciculus, can facilitate functional recovery.
Collapse
Affiliation(s)
| | - Alex Teghipco
- Department of Cognitive Sciences, University of California Irvine, USA
| | | | - Raouf Belkhir
- Department of Psychology, Carnegie Mellon University, USA
| | - Max H Sims
- Department of Neurology, University of Rochester, USA
| | - David A Paul
- Department of Neurosurgery, University of Rochester Medical Center, USA
| | - Madalina E Tivarus
- Department of Imaging Sciences, University of Rochester Medical Center, USA; Department of Neuroscience, University of Rochester Medical Center, USA
| | - Susan O Smith
- Department of Neurosurgery, University of Rochester Medical Center, USA
| | - Eric Hintz
- Department of Neurosurgery, University of Rochester Medical Center, USA
| | - Webster H Pilcher
- Department of Neurosurgery, University of Rochester Medical Center, USA
| | - Bradford Z Mahon
- Department of Psychology, Carnegie Mellon University, USA; Department of Neurology, University of Rochester, USA; Department of Neurosurgery, University of Rochester Medical Center, USA.
| |
Collapse
|
55
|
Liu X, Kinoshita M, Shinohara H, Hori O, Ozaki N, Nakada M. Does the superior fronto-occipital fascicle exist in the human brain? Fiber dissection and brain functional mapping in 90 patients with gliomas. NEUROIMAGE-CLINICAL 2020; 25:102192. [PMID: 32014826 PMCID: PMC6997620 DOI: 10.1016/j.nicl.2020.102192] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Revised: 12/19/2019] [Accepted: 01/20/2020] [Indexed: 01/04/2023]
Abstract
Existence of superior fronto-occipital fascicle (SFOF) in humans is controversial. Fiber dissection in vitro revealed Muratoff and Probst bundles but not SFOF. Direct functional mappings for SFOF were performed in 90 awake craniotomies. Eight of total 453 positive sites were located in the region believed to be SFOF. The anatomo-functional features suggest that SFOF might not exist in human brain.
The presence of the superior fronto-occipital fascicle (SFOF) has been reported in the Rhesus monkey; however, it is a subject of controversy in humans. The aim of this study is to identify the SFOF using both in vitro and in vivo anatomo-functional analyses. This study consisted of two approaches. First, one acallosal brain and 12 normal postmortem hemispheres (five left and seven right sides) were dissected under a microscope using Klingler's fiber dissection technique. We focused on the medial subcallosal area superior to the Muratoff bundle, which has been indicated as a principal target area of the SFOF in previous studies. Second, 90 patients underwent awake craniotomy for gliomas with direct electrical stimulations. Functional examinations for visual, ataxic, and cognitive tasks were performed and 453 positive mapping sites were investigated by voxel-based morphometry analysis to establish the functions of the SFOF. The corticostriatal fibers, or the Muratoff bundle, and thalamic peduncle fibers joined in the area of the caudate nucleus, making thalamic peduncle/ corticostriatal bundles, which ran antero-posteriorly in the anterior subcallosal area and radiated from the caudate superior margin in the posterior subcallosal area. However, no SFOF fiber bundle crossed perpendicular to the thalamic peduncle/ corticostriatal bundles in the posterior subcallosal area. In the acallosal hemispheres, Probst bundles were confirmed and the subcallosal areas did not show a specific organization different from the normal brain. Hence, we could not detect a long and continuous association fascicle connecting the frontal lobe and occipital or parietal lobe in the target areas. Furthermore, in the in vivo functional mappings of awake surgery and voxel-based morphometry analysis, eight positive points on the SFOF were selected from the total 453 positive points, but their functions were not related with visual processing and spatial awareness, as has been reported in previous studies. In conclusion, in the present study we attempted to investigate the existence of the SFOF using an anatomical and functional approach. According to our results, the SFOF may not exist in the human brain.
Collapse
Affiliation(s)
- Xiaoliang Liu
- Department of Neurosurgery, Kanazawa University,13-1 Takara-machi, Kanazawa, 920-8641 Japan; Department of Neurosurgery, The First Hospital of Jilin University, China
| | - Masashi Kinoshita
- Department of Neurosurgery, Kanazawa University,13-1 Takara-machi, Kanazawa, 920-8641 Japan.
| | | | - Osamu Hori
- Department of Neuroanatomy, Kanazawa University, Japan
| | - Noriyuki Ozaki
- Department of Functional anatomy, Kanazawa University, Japan
| | - Mitsutoshi Nakada
- Department of Neurosurgery, Kanazawa University,13-1 Takara-machi, Kanazawa, 920-8641 Japan
| |
Collapse
|
56
|
Dooley N, O'Hanlon E, Healy C, Adair A, McCandless C, Coppinger D, Kelleher I, Clarke M, Leemans A, Frodl T, Cannon M. Psychotic experiences in childhood are associated with increased structural integrity of the left arcuate fasciculus - A population-based case-control study. Schizophr Res 2020; 215:378-384. [PMID: 31495700 DOI: 10.1016/j.schres.2019.08.022] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Revised: 06/26/2019] [Accepted: 08/19/2019] [Indexed: 01/03/2023]
Abstract
Around 1 in 5 children under 13 years old experience sub-clinical psychotic experiences (PEs) like hallucinations and delusions. While PEs in childhood are a significant risk factor for adult psychotic disorders, the majority of those experiencing childhood PEs do not develop a psychotic disorder. Individual differences in regional brain maturation rates may be responsible for this age-related and often transient emergence of PEs. Fronto-temporal association tracts undergo extensive maturation and myelination throughout childhood and adolescence, thus we focus on individual differences in one such tract, the arcuate fasciculus. A normative population-based sample of children (aged 11-13) attended a clinical interview and MRI (n = 100), 25 of whom were identified as reporting strong PEs. This group had reduced mean and radial diffusivity in the arcuate fasciculus compared with a group of matched controls (n = 25) who reported no PEs. The group difference was greater in the left hemisphere than the right. Mediation analyses showed that this group difference was driven predominantly by perceptual disturbances and an along-tract analysis showed that the group difference was greatest approximately halfway between the frontal and temporal termination points of the tract (adjacent to the left lateral ventricle). This study is the first to investigate links between arcuate fasciculus diffusivity and psychotic experiences in a population sample of children.
Collapse
Affiliation(s)
- Niamh Dooley
- Department of Psychiatry, Royal College of Surgeons in Ireland, Dublin, Ireland; Trinity College Institute of Neuroscience, Trinity College Dublin, Dublin, Ireland.
| | - Erik O'Hanlon
- Department of Psychiatry, Royal College of Surgeons in Ireland, Dublin, Ireland; Trinity College Institute of Neuroscience, Trinity College Dublin, Dublin, Ireland.
| | - Colm Healy
- Department of Psychiatry, Royal College of Surgeons in Ireland, Dublin, Ireland.
| | - Amy Adair
- Department of Psychiatry, Royal College of Surgeons in Ireland, Dublin, Ireland; Trinity College Institute of Neuroscience, Trinity College Dublin, Dublin, Ireland.
| | - Conor McCandless
- Department of Psychiatry, Royal College of Surgeons in Ireland, Dublin, Ireland.
| | - David Coppinger
- Department of Psychiatry, Royal College of Surgeons in Ireland, Dublin, Ireland.
| | - Ian Kelleher
- Department of Psychiatry, Royal College of Surgeons in Ireland, Dublin, Ireland.
| | - Mary Clarke
- Department of Psychiatry, Royal College of Surgeons in Ireland, Dublin, Ireland.
| | - Alexander Leemans
- Image Sciences Institute, University Medical Center Utrecht, the Netherlands.
| | - Thomas Frodl
- Otto-von-Guericke University Magdeburg, Department of Psychiatry and Psychotherapy, Magdeburg, Germany.
| | - Mary Cannon
- Department of Psychiatry, Royal College of Surgeons in Ireland, Dublin, Ireland; Trinity College Institute of Neuroscience, Trinity College Dublin, Dublin, Ireland.
| |
Collapse
|
57
|
Mandonnet E, Sarubbo S, Petit L. Response: Commentary: The Nomenclature of Human White Matter Association Pathways: Proposal for a Systematic Taxonomic Anatomical Classification. Front Neuroanat 2019; 13:91. [PMID: 31680882 PMCID: PMC6811495 DOI: 10.3389/fnana.2019.00091] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Accepted: 10/03/2019] [Indexed: 11/30/2022] Open
Affiliation(s)
| | - Silvio Sarubbo
- Division of Neurosurgery, Structural and Functional Connectivity Lab, Azienda Provinciale per i Servizi Sanitari, Trento, Italy
| | - Laurent Petit
- Groupe d'Imagerie Neurofonctionnelle, Institut des Maladies Neurodégénératives-UMR 5293, CNRS, CEA University of Bordeaux, Bordeaux, France
| |
Collapse
|
58
|
Sarubbo S, Tate M, De Benedictis A, Merler S, Moritz-Gasser S, Herbet G, Duffau H. Mapping critical cortical hubs and white matter pathways by direct electrical stimulation: an original functional atlas of the human brain. Neuroimage 2019; 205:116237. [PMID: 31626897 DOI: 10.1016/j.neuroimage.2019.116237] [Citation(s) in RCA: 114] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Revised: 09/25/2019] [Accepted: 09/30/2019] [Indexed: 01/19/2023] Open
Abstract
OBJECTIVE The structural and functional organization of brain networks subserving basic daily activities (i.e. language, visuo-spatial cognition, movement, semantics, etc.) are not completely understood to date. Here, we report the first probabilistic cortical and subcortical atlas of critical structures mediating human brain functions based on direct electrical stimulation (DES), a well-validated tool for the exploration of cerebral processing and for performing safe surgical interventions in eloquent areas. METHODS We collected 1162 cortical and 659 subcortical DES responses during testing of 16 functional domains in 256 patients undergoing awake surgery. Spatial coordinates for each functional response were calculated, and probability distributions for the entire patient cohort were mapped onto a standardized three-dimensional brain template using a multinomial statistical analysis. In addition, matching analyses were performed against prior established anatomy-based cortical and white matter (WM) atlases. RESULTS The probabilistic maps for each functional domain were provided. The topographical analysis demonstrated a wide spatial distribution of cortical functional responses, while subcortical responses were more restricted, localizing to known WM pathways. These DES-derived data showed reliable matching with existing cortical and WM atlases as well as recent neuroimaging and neurophysiological data. CONCLUSIONS We present the first integrated and comprehensive cortical-subcortical atlas of structures essential for humans' neural functions based on highly-specific DES mapping during real-time neuropsychological testing. This novel atlas can serve as a complementary tool for neuroscientists, along with data obtained from other modalities, to improve and refine our understanding of the functional anatomy of critical brain networks.
Collapse
Affiliation(s)
- Silvio Sarubbo
- Division of Neurosurgery, Structural and Functional Connectivity Lab Project, Azienda Provinciale per i Servizi Sanitari (APSS), 9 Largo Medaglie d'Oro, 38122, Trento, Italy.
| | - Matthew Tate
- Departments of Neurosurgery and Neurology, Northwestern University, Feinberg School of Medicine, 420 E Superior St, 60611, Chicago, IL, USA
| | - Alessandro De Benedictis
- Neurosurgery Unit, Department of Neuroscience and Neurorehabilitation, Bambino Gesù Children's Hospital IRCCS, 4 Piazza Sant'Onofrio, 00165, Rome, Italy
| | | | - Sylvie Moritz-Gasser
- Department of Neurosurgery, Gui de Chauliac Hospital, Montpellier University Medical Center, 80 Avenue Augustin Fliche, Montpellier, France; National Institute for Health and Medical Research (INSERM), U1051, Team ''Plasticity of the Central Nervous System, Human Stem Cells and Glial Tumors'', Institute for Neurosciences of Montpellier, Montpellier University Medical Center, 80 Av Augustin Fliche, Montpellier, France
| | - Guillaume Herbet
- Department of Neurosurgery, Gui de Chauliac Hospital, Montpellier University Medical Center, 80 Avenue Augustin Fliche, Montpellier, France; National Institute for Health and Medical Research (INSERM), U1051, Team ''Plasticity of the Central Nervous System, Human Stem Cells and Glial Tumors'', Institute for Neurosciences of Montpellier, Montpellier University Medical Center, 80 Av Augustin Fliche, Montpellier, France
| | - Hugues Duffau
- Department of Neurosurgery, Gui de Chauliac Hospital, Montpellier University Medical Center, 80 Avenue Augustin Fliche, Montpellier, France; National Institute for Health and Medical Research (INSERM), U1051, Team ''Plasticity of the Central Nervous System, Human Stem Cells and Glial Tumors'', Institute for Neurosciences of Montpellier, Montpellier University Medical Center, 80 Av Augustin Fliche, Montpellier, France
| |
Collapse
|
59
|
Sarubbo S, Petit L. Editorial: Organization of the White Matter Anatomy in the Human Brain. Front Neuroanat 2019; 13:85. [PMID: 31619972 PMCID: PMC6759501 DOI: 10.3389/fnana.2019.00085] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Accepted: 09/04/2019] [Indexed: 01/16/2023] Open
Affiliation(s)
- Silvio Sarubbo
- Division of Neurosurgery, Structural and Functional Connectivity Lab Project, Azienda Provinciale per i Servizi Sanitari, Trento, Italy
| | - Laurent Petit
- Groupe d'Imagerie Neurofonctionnelle, Institut des Maladies Neurodégératives (IMN)-UMR5293-CNRS, CEA, Université de Bordeaux, Bordeaux, France
| |
Collapse
|
60
|
Lee MH, O'Hara NB, Motoi H, Luat AF, Juhász C, Sood S, Asano E, Jeong JW. Novel diffusion tractography methodology using Kalman filter prediction to improve preoperative benefit-risk analysis in pediatric epilepsy surgery. J Neurosurg Pediatr 2019; 24:293-305. [PMID: 31277057 PMCID: PMC9080971 DOI: 10.3171/2019.4.peds1994] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Accepted: 04/24/2019] [Indexed: 11/06/2022]
Abstract
OBJECTIVE In this study the authors investigated the clinical reliability of diffusion weighted imaging maximum a posteriori probability (DWI-MAP) analysis with Kalman filter prediction in pediatric epilepsy surgery. This approach can yield a suggested resection margin as a dynamic variable based on preoperative DWI-MAP pathways. The authors sought to determine how well the suggested margin would have maximized occurrence of postoperative seizure freedom (benefit) and minimized occurrence of postoperative neurological deficits (risk). METHODS The study included 77 pediatric patients with drug-resistant focal epilepsy (age 10.0 ± 4.9 years) who underwent resection of their presumed epileptogenic zone. In preoperative DWI tractography from the resected hemisphere, 9 axonal pathways, Ci=1-9, were identified using DWI-MAP as follows: C1-3 supporting face, hand, and leg motor areas; C4 connecting Broca's and Wernicke's areas; C5-8 connecting Broca's, Wernicke's, parietal, and premotor areas; and C9 connecting the occipital lobe and lateral geniculate nucleus. For each Ci, the resection margin, di, was measured by the minimal Euclidean distance between the voxels of Ci and the resection boundary determined by spatially coregistered postoperative MRI. If Ci was resected, di was assumed to be negative (calculated as -1 × average Euclidean distance between every voxel inside the resected Ci volume, ri). Kalman filter prediction was then used to estimate an optimal resection margin, d*i, to balance benefit and risk by approximating the relationship between di and ri. Finally, the authors defined the preservation zone of Ci that can balance the probability of benefit and risk by expanding the cortical area of Ci up to d*i on the 3D cortical surface. RESULTS In the whole group (n = 77), nonresection of the preoperative preservation zone (i.e., actual resection margin d*i greater than the Kalman filter-defined d*i) accurately predicted the absence of postoperative motor (d*1-3: 0.93 at seizure-free probability of 0.80), language (d*4-8: 0.91 at seizure-free probability of 0.81), and visual deficits (d*9: 0.90 at seizure-free probability of 0.75), suggesting that the preservation of preoperative Ci within d*i supports a balance between postoperative functional deficit and seizure freedom. The subsequent subgroup analyses found that preservation of preoperative Ci =1-4,9 within d*i =1-4,9 may provide accurate deficit predictions independent of age and seizure frequency, suggesting that the DWI-based surgical margin can be effective for surgical planning even in young children and across a range of epilepsy severity. CONCLUSIONS Integrating DWI-MAP analysis with Kalman filter prediction may help guide epilepsy surgery by visualizing the margins of the eloquent white matter pathways to be preserved.
Collapse
Affiliation(s)
- Min-Hee Lee
- Departments of1Pediatrics
- 5Translational Imaging Laboratory, Children's Hospital of Michigan, Detroit, Michigan
| | - Nolan B O'Hara
- 4Translational Neuroscience Program, Wayne State University School of Medicine, Detroit; and
- 5Translational Imaging Laboratory, Children's Hospital of Michigan, Detroit, Michigan
| | | | | | - Csaba Juhász
- Departments of1Pediatrics
- 2Neurology, and
- 3Neurosurgery, and
- 4Translational Neuroscience Program, Wayne State University School of Medicine, Detroit; and
- 5Translational Imaging Laboratory, Children's Hospital of Michigan, Detroit, Michigan
| | | | - Eishi Asano
- Departments of1Pediatrics
- 2Neurology, and
- 4Translational Neuroscience Program, Wayne State University School of Medicine, Detroit; and
| | - Jeong-Won Jeong
- Departments of1Pediatrics
- 2Neurology, and
- 4Translational Neuroscience Program, Wayne State University School of Medicine, Detroit; and
- 5Translational Imaging Laboratory, Children's Hospital of Michigan, Detroit, Michigan
| |
Collapse
|
61
|
Capilla-Guasch P, Quilis-Quesada V, Regin-Neto M, Holanda VM, González-Darder JM, de Oliveira E. White Matter Relationships Examined by Transillumination Technique Using a Lateral Transcortical Parietal Approach to the Atrium: Three-Dimensional Images and Surgical Considerations. World Neurosurg 2019; 132:e783-e794. [PMID: 31415888 DOI: 10.1016/j.wneu.2019.08.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Revised: 08/02/2019] [Accepted: 08/03/2019] [Indexed: 11/28/2022]
Abstract
BACKGROUND Numerous lesions are found in the ventricular atrium (VA). Access is gained through many white matter tracts with great relevance and specific neurologic functions. It is important to understand the configuration of the most relevant structures surrounding this zone and, thus, select the safest entry zone on the lateral cerebral surface. OBJECTIVE We studied the white matter layers traversed in the lateral transcortical parietal approach through the intraparietal sulcus (IPS), adding a transillumination technique. With this knowledge, we selected the safest highway to improve this particular approach. METHODS An in-depth study of the white matter tracts was performed on 24 cerebral hemispheres (12 human whole brains). The Klingler technique and microsurgical dissection techniques were used under ×6 to ×40 magnification. The transillumination technique (torch illuminating the ventricular cavity) was used to expose the layers surrounding the VA and, thus, guide the dissection. RESULTS Taking the IPS on the cerebral surface as a reference, we identified the following white matter layers ordered from the surface to the ependyma: U fibers, superior longitudinal fascicle, arcuate fascicle, vertical occipital fascicle, sagittal stratum with the optic radiations, and tapetum fibers. The transillumination technique allowed for the easier identification of the white matter deep periventricular layers. CONCLUSIONS Knowledge of the main fascicles in the path and neighborhood of the VA allowed us to understand how certain neurologic functions can be affected by lesions at this level and to select the most appropriate way to avoid damaging relevant fascicles.
Collapse
Affiliation(s)
- Pau Capilla-Guasch
- Department of Neurosurgery, Hospital Clínico Universitario de Valencia, Valencia, Spain; Department of Anatomy and Human Embriology, Microneurosurgery Laboratory, University of Valencia, Valencia, Spain.
| | - Vicent Quilis-Quesada
- Department of Neurosurgery, Hospital Clínico Universitario de Valencia, Valencia, Spain; Department of Anatomy and Human Embriology, Microneurosurgery Laboratory, University of Valencia, Valencia, Spain; Mayo Clinic College of Medicine and Science, Jacksonville, Florida, USA
| | - Mateus Regin-Neto
- Institute of Neurological Sciences (ICNE), São Paulo, Brazil; Microneurosurgery Laboratory, Hospital Beneficieência Portuguesa, São Paulo, Brazil
| | - Vanessa M Holanda
- Institute of Neurological Sciences (ICNE), São Paulo, Brazil; Microneurosurgery Laboratory, Hospital Beneficieência Portuguesa, São Paulo, Brazil
| | - José M González-Darder
- Department of Neurosurgery, Hospital Clínico Universitario de Valencia, Valencia, Spain; Department of Anatomy and Human Embriology, Microneurosurgery Laboratory, University of Valencia, Valencia, Spain
| | - Evandro de Oliveira
- Institute of Neurological Sciences (ICNE), São Paulo, Brazil; Microneurosurgery Laboratory, Hospital Beneficieência Portuguesa, São Paulo, Brazil
| |
Collapse
|
62
|
Baran O, Baydin S, Gungor A, Balak N, Middlebrooks E, Saygi T, Aydin I, Tanriover N. Surgical Approaches to the Thalamus in Relation to the White Matter Tracts of the Cerebrum. World Neurosurg 2019; 128:e1048-e1086. [DOI: 10.1016/j.wneu.2019.05.068] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Accepted: 05/08/2019] [Indexed: 12/20/2022]
|
63
|
Panesar SS, Fernandez-Miranda J. Commentary: The Nomenclature of Human White Matter Association Pathways: Proposal for a Systematic Taxonomic Anatomical Classification. Front Neuroanat 2019; 13:61. [PMID: 31244620 PMCID: PMC6580230 DOI: 10.3389/fnana.2019.00061] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Accepted: 05/24/2019] [Indexed: 12/29/2022] Open
Affiliation(s)
- Sandip S Panesar
- Department of Neurosurgery, Stanford University, Stanford, CA, United States
| | | |
Collapse
|
64
|
Bain JS, Yeatman JD, Schurr R, Rokem A, Mezer AA. Evaluating arcuate fasciculus laterality measurements across dataset and tractography pipelines. Hum Brain Mapp 2019; 40:3695-3711. [PMID: 31106944 DOI: 10.1002/hbm.24626] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2019] [Revised: 04/18/2019] [Accepted: 05/01/2019] [Indexed: 11/11/2022] Open
Abstract
The arcuate fasciculi are white-matter pathways that connect frontal and temporal lobes in each hemisphere. The arcuate plays a key role in the language network and is believed to be left-lateralized, in line with left hemisphere dominance for language. Measuring the arcuate in vivo requires diffusion magnetic resonance imaging-based tractography, but asymmetry of the in vivo arcuate is not always reliably detected in previous studies. It is unknown how the choice of tractography algorithm, with each method's freedoms, constraints, and vulnerabilities to false-positive and -negative errors, impacts findings of arcuate asymmetry. Here, we identify the arcuate in two independent datasets using a number of tractography strategies and methodological constraints, and assess their impact on estimates of arcuate laterality. We test three tractography methods: a deterministic, a probabilistic, and a tractography-evaluation (LiFE) algorithm. We extract the arcuate from the whole-brain tractogram, and compare it to an arcuate bundle constrained even further by selecting only those streamlines that connect to anatomically relevant cortical regions. We test arcuate macrostructure laterality, and also evaluate microstructure profiles for properties such as fractional anisotropy and quantitative R1. We find that both tractography choice and implementing the cortical constraints substantially impact estimates of all indices of arcuate laterality. Together, these results emphasize the effect of the tractography pipeline on estimates of arcuate laterality in both macrostructure and microstructure.
Collapse
Affiliation(s)
- Jonathan S Bain
- The Edmond & Lily Safra Center for Brain Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Jason D Yeatman
- Institute for Learning & Brain Sciences and Department of Speech and Hearing Science, The University of Washington, Seattle, Washington, USA
| | - Roey Schurr
- The Edmond & Lily Safra Center for Brain Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Ariel Rokem
- The University of Washington eScience Institute, The University of Washington, Seattle, Washington, USA
| | - Aviv A Mezer
- The Edmond & Lily Safra Center for Brain Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel
| |
Collapse
|
65
|
Lee MH, O'Hara NB, Nakai Y, Luat AF, Juhasz C, Sood S, Asano E, Jeong JW. Prediction of postoperative deficits using an improved diffusion-weighted imaging maximum a posteriori probability analysis in pediatric epilepsy surgery. J Neurosurg Pediatr 2019; 23:648-659. [PMID: 30797207 PMCID: PMC9019725 DOI: 10.3171/2018.11.peds18601] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Accepted: 11/28/2018] [Indexed: 11/06/2022]
Abstract
OBJECTIVE This study is aimed at improving the clinical utility of diffusion-weighted imaging maximum a posteriori probability (DWI-MAP) analysis, which has been reported to be useful for predicting postoperative motor, language, and visual field deficits in pediatric epilepsy surgery. The authors determined the additive value of a new clustering mapping method in which average direct-flip distance (ADFD) reclassifies the outliers of original DWI-MAP streamlines by referring to their minimum distances to the exemplar streamlines (i.e., medoids). METHODS The authors studied 40 children with drug-resistant focal epilepsy (mean age 8.7 ± 4.8 years) who had undergone resection of the presumed epileptogenic zone and had five categories of postoperative deficits (i.e., hemiparesis involving the face, hand, and/or leg; dysphasia requiring speech therapy; and/or visual field cut). In pre- and postoperative images of the resected hemisphere, DWI-MAP identified a total of nine streamline pathways: C1 = face motor area, C2 = hand motor area, C3 = leg motor area, C4 = Broca's area-Wernicke's area, C5 = premotor area-Broca's area, C6 = premotor area-Wernicke's area, C7 = parietal area-Wernicke's area, C8 = premotor area-parietal area, and C9 = occipital lobe-lateral geniculate nucleus. For each streamline of the identified pathway, the minimal ADFD to the nine exemplars corrected the pathway membership. Binary logistic regression analysis was employed to determine how accurately two fractional predictors, Δ1-9 (postoperative volume change of C1-9) and γ1-9 (preoperatively planned volume of C1-9 resected), predicted postoperative motor, language, and visual deficits. RESULTS The addition of ADFD to DWI-MAP analysis improved the sensitivity and specificity of regression models for predicting postoperative motor, language, and visual deficits by 28% for Δ1-3 (from 0.62 to 0.79), 13% for Δ4-8 (from 0.69 to 0.78), 13% for Δ9 (from 0.77 to 0.87), 7% for γ1-3 (from 0.81 to 0.87), 1% for γ4-8 (from 0.86 to 0.87), and 24% for γ9 (from 0.75 to 0.93). Preservation of the eloquent pathways defined by preoperative DWI-MAP analysis with ADFD (up to 97% of C1-4,9) prevented postoperative motor, language, and visual deficits with sensitivity and specificity ranging from 88% to 100%. CONCLUSIONS The present study suggests that postoperative functional outcome substantially differs according to the extent of resected white matter encompassing eloquent cortex as determined by preoperative DWI-MAP analysis. The preservation of preoperative DWI-MAP-defined pathways may be crucial to prevent postoperative deficits. The improved DWI-MAP analysis may provide a complementary noninvasive tool capable of guiding the surgical margin to minimize the risk of postoperative deficits for children.
Collapse
Affiliation(s)
- Min-Hee Lee
- Departments of1Pediatrics
- 5Translational Imaging Laboratory, Children's Hospital of Michigan, Detroit, Michigan
| | - Nolan B O'Hara
- 4Translational Neuroscience Program, Wayne State University School of Medicine; and
- 5Translational Imaging Laboratory, Children's Hospital of Michigan, Detroit, Michigan
| | | | | | - Csaba Juhasz
- Departments of1Pediatrics
- 2Neurology, and
- 3Neurosurgery
- 4Translational Neuroscience Program, Wayne State University School of Medicine; and
- 5Translational Imaging Laboratory, Children's Hospital of Michigan, Detroit, Michigan
| | | | - Eishi Asano
- Departments of1Pediatrics
- 2Neurology, and
- 4Translational Neuroscience Program, Wayne State University School of Medicine; and
| | - Jeong-Won Jeong
- Departments of1Pediatrics
- 2Neurology, and
- 4Translational Neuroscience Program, Wayne State University School of Medicine; and
- 5Translational Imaging Laboratory, Children's Hospital of Michigan, Detroit, Michigan
| |
Collapse
|
66
|
Bernard F, Zemmoura I, Ter Minassian A, Lemée JM, Menei P. Anatomical variability of the arcuate fasciculus: a systematical review. Surg Radiol Anat 2019; 41:889-900. [PMID: 31028450 DOI: 10.1007/s00276-019-02244-5] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2018] [Accepted: 04/17/2019] [Indexed: 11/30/2022]
Abstract
PURPOSE The arcuate fasciculus (AF) is a white matter fibers tract that links the lateral temporal with the frontal cortex. The AF can be divided into three components: two superficial indirect short tracts (anterior and posterior) and one deep direct long tract. Both DTI and white matter dissections studies find differences regarding the anatomy of the AF, especially its cortical connections. This paper aims at providing a comprehensive anatomical classification of the AF, using the terminologia anatomica. METHODS Articles (n = 478) were obtained from a systematical PRISMA review. Studies which focused on primates, unhealthy subjects, as well as studies without cortical termination description and review articles were excluded from the analysis. One hundred and ten articles were retained for full-text examination, of which 19 finally fulfilled our criteria to be included in this review. RESULTS We classified main descriptions and variations of each segment of the AF according to fiber orientation and cortical connections. Three types of connections were depicted for each segment of the AF. Concerning the anterior segment, most of the frontal fibers (59.35%) ran from the ventral portion of the precentral gyrus and the posterior part of the pars opercularis, to the supramarginal gyrus (85.0%). Main fibers of the posterior segment of the AF ran from the posterior portion of the middle temporal gyrus (100%) to the angular gyrus (92.0%). In main descriptions of the long segment of the AF, fibers ran from both the ventral portion of the precentral gyrus and posterior part of the pars opercularis (63.9%) to the middle and inferior temporal gyrus (60.3%). Minor subtypes were described in detail in the article. CONCLUSION We provide a comprehensive classification of the anatomy of the AF, regarding the orientation and cortical connections of its fibers. Although fiber orientation is very consistent, cortical endings of the AF may be different from one study to another, or from one individual to another which is a key element to understand the anatomical basis of current models of language or to guide intraoperative stimulation during awake surgery.
Collapse
Affiliation(s)
- Florian Bernard
- , Department of Neurosurgery, Teaching Hospital, 49100, Angers, France. .,Laboratory of Anatomy, Medical Faculty, 28 rue Roger Amsler, 49100, Angers, France.
| | - Ilyess Zemmoura
- Department of Neurosurgery, CHRU de Tours, Tours, France.,UMR1253, iBrain, Université de Tours, Inserm, Tours, France
| | - Aram Ter Minassian
- Department of Reanimation, Teaching Hospital, 49100, Angers, France.,INSERM, 1066 Department and EA7315 Team, Angers, France
| | - Jean-Michel Lemée
- , Department of Neurosurgery, Teaching Hospital, 49100, Angers, France.,CRCINA, UMR 1232 INSERM/CNRS and EA7315 Team, Angers, France
| | - Philippe Menei
- , Department of Neurosurgery, Teaching Hospital, 49100, Angers, France.,CRCINA, UMR 1232 INSERM/CNRS and EA7315 Team, Angers, France
| |
Collapse
|
67
|
Braun Janzen T, Haase M, Thaut MH. Rhythmic priming across effector systems: A randomized controlled trial with Parkinson’s disease patients. Hum Mov Sci 2019; 64:355-365. [DOI: 10.1016/j.humov.2019.03.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2018] [Revised: 02/21/2019] [Accepted: 03/01/2019] [Indexed: 01/23/2023]
|
68
|
Maffei C, Sarubbo S, Jovicich J. A Missing Connection: A Review of the Macrostructural Anatomy and Tractography of the Acoustic Radiation. Front Neuroanat 2019; 13:27. [PMID: 30899216 PMCID: PMC6416820 DOI: 10.3389/fnana.2019.00027] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Accepted: 02/15/2019] [Indexed: 12/13/2022] Open
Abstract
The auditory system of mammals is dedicated to encoding, elaborating and transporting acoustic information from the auditory nerve to the auditory cortex. The acoustic radiation (AR) constitutes the thalamo-cortical projection of this system, conveying the auditory signals from the medial geniculate nucleus (MGN) of the thalamus to the transverse temporal gyrus on the superior temporal lobe. While representing one of the major sensory pathways of the primate brain, the currently available anatomical information of this white matter bundle is quite limited in humans, thus constituting a notable omission in clinical and general studies on auditory processing and language perception. Tracing procedures in humans have restricted applications, and the in vivo reconstruction of this bundle using diffusion tractography techniques remains challenging. Hence, a more accurate and reliable reconstruction of the AR is necessary for understanding the neurobiological substrates supporting audition and language processing mechanisms in both health and disease. This review aims to unite available information on the macroscopic anatomy and topography of the AR in humans and non-human primates. Particular attention is brought to the anatomical characteristics that make this bundle difficult to reconstruct using non-invasive techniques, such as diffusion-based tractography. Open questions in the field and possible future research directions are discussed.
Collapse
Affiliation(s)
- Chiara Maffei
- Harvard Medical School, Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, United States.,Center for Mind/Brain Sciences - CIMeC, University of Trento, Trento, Italy
| | - Silvio Sarubbo
- Division of Neurosurgery, Structural and Functional Connectivity Lab Project, S. Chiara Hospital, Trento Azienda Provinciale per i Servizi Sanitari (APSS), Trento, Italy
| | - Jorge Jovicich
- Center for Mind/Brain Sciences - CIMeC, University of Trento, Trento, Italy.,Department of Psychology and Cognitive Sciences, University of Trento, Trento, Italy
| |
Collapse
|
69
|
David S, Heemskerk AM, Corrivetti F, Thiebaut de Schotten M, Sarubbo S, Corsini F, De Benedictis A, Petit L, Viergever MA, Jones DK, Mandonnet E, Axer H, Evans J, Paus T, Leemans A. The Superoanterior Fasciculus (SAF): A Novel White Matter Pathway in the Human Brain? Front Neuroanat 2019; 13:24. [PMID: 30890921 PMCID: PMC6412356 DOI: 10.3389/fnana.2019.00024] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2018] [Accepted: 02/07/2019] [Indexed: 01/01/2023] Open
Abstract
Fiber tractography (FT) using diffusion magnetic resonance imaging (dMRI) is widely used for investigating microstructural properties of white matter (WM) fiber-bundles and for mapping structural connections of the human brain. While studying the architectural configuration of the brain's circuitry with FT is not without controversy, recent progress in acquisition, processing, modeling, analysis, and visualization of dMRI data pushes forward the reliability in reconstructing WM pathways. Despite being aware of the well-known pitfalls in analyzing dMRI data and several other limitations of FT discussed in recent literature, we present the superoanterior fasciculus (SAF), a novel bilateral fiber tract in the frontal region of the human brain that-to the best of our knowledge-has not been documented. The SAF has a similar shape to the anterior part of the cingulum bundle, but it is located more frontally. To minimize the possibility that these FT findings are based on acquisition or processing artifacts, different dMRI data sets and processing pipelines have been used to describe the SAF. Furthermore, we evaluated the configuration of the SAF with complementary methods, such as polarized light imaging (PLI) and human brain dissections. The FT results of the SAF demonstrate a long pathway, consistent across individuals, while the human dissections indicate fiber pathways connecting the postero-dorsal with the antero-dorsal cortices of the frontal lobe.
Collapse
Affiliation(s)
- Szabolcs David
- Image Sciences Institute, University Medical Center Utrecht and Utrecht University, Utrecht, Netherlands
| | - Anneriet M. Heemskerk
- Image Sciences Institute, University Medical Center Utrecht and Utrecht University, Utrecht, Netherlands
| | | | | | - Silvio Sarubbo
- Structural and Functional Connectivity Lab Project, Department of Emergency, Division of Neurosurgery, “S. Chiara” Hospital, Azienda Provinciale per i Servizi Sanitari (APSS), Trento, Italy
| | - Francesco Corsini
- Structural and Functional Connectivity Lab Project, Department of Emergency, Division of Neurosurgery, “S. Chiara” Hospital, Azienda Provinciale per i Servizi Sanitari (APSS), Trento, Italy
| | - Alessandro De Benedictis
- Department of Neurosciences, Division of Neurosurgery, “Bambino Gesù” Children Hospital, IRCCS, Rome, Italy
| | - Laurent Petit
- Groupe d’Imagerie Neurofonctionnelle (GIN), Institut des Maladies Neurodégératives (IMN)-UMR5293-CNRS, CEA, Université de Bordeaux, Bordeaux, France
| | - Max A. Viergever
- Image Sciences Institute, University Medical Center Utrecht and Utrecht University, Utrecht, Netherlands
| | - Derek K. Jones
- Cardiff University Brain Research Imaging Centre, School of Psychology, Cardiff, United Kingdom
| | | | - Hubertus Axer
- Hans Berger Department of Neurology, Jena University Hospital, Friedrich-Schiller University Jena, Jena, Germany
| | - John Evans
- Cardiff University Brain Research Imaging Centre, School of Psychology, Cardiff, United Kingdom
| | - Tomáš Paus
- Bloorview Research Institute, Holland Bloorview Kids Rehabilitation Hospital, Toronto, ON, Canada
- Departments of Psychology and Psychiatry, University of Toronto, Toronto, ON, Canada
| | - Alexander Leemans
- Image Sciences Institute, University Medical Center Utrecht and Utrecht University, Utrecht, Netherlands
| |
Collapse
|
70
|
Schaffert N, Janzen TB, Mattes K, Thaut MH. A Review on the Relationship Between Sound and Movement in Sports and Rehabilitation. Front Psychol 2019; 10:244. [PMID: 30809175 PMCID: PMC6379478 DOI: 10.3389/fpsyg.2019.00244] [Citation(s) in RCA: 79] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2018] [Accepted: 01/24/2019] [Indexed: 12/19/2022] Open
Abstract
The role of auditory information on perceptual-motor processes has gained increased interest in sports and psychology research in recent years. Numerous neurobiological and behavioral studies have demonstrated the close interaction between auditory and motor areas of the brain, and the importance of auditory information for movement execution, control, and learning. In applied research, artificially produced acoustic information and real-time auditory information have been implemented in sports and rehabilitation to improve motor performance in athletes, healthy individuals, and patients affected by neurological or movement disorders. However, this research is scattered both across time and scientific disciplines. The aim of this paper is to provide an overview about the interaction between movement and sound and review the current literature regarding the effect of natural movement sounds, movement sonification, and rhythmic auditory information in sports and motor rehabilitation. The focus here is threefold: firstly, we provide an overview of empirical studies using natural movement sounds and movement sonification in sports. Secondly, we review recent clinical and applied studies using rhythmic auditory information and sonification in rehabilitation, addressing in particular studies on Parkinson's disease and stroke. Thirdly, we summarize current evidence regarding the cognitive mechanisms and neural correlates underlying the processing of auditory information during movement execution and its mental representation. The current state of knowledge here reviewed provides evidence of the feasibility and effectiveness of the application of auditory information to improve movement execution, control, and (re)learning in sports and motor rehabilitation. Findings also corroborate the critical role of auditory information in auditory-motor coupling during motor (re)learning and performance, suggesting that this area of clinical and applied research has a large potential that is yet to be fully explored.
Collapse
Affiliation(s)
- Nina Schaffert
- Department of Movement and Training Science, Institute for Human Movement Science, University of Hamburg, Hamburg, Germany
| | - Thenille Braun Janzen
- Music and Health Science Research Collaboratory, Faculty of Music, University of Toronto, Toronto, ON, Canada
| | - Klaus Mattes
- Department of Movement and Training Science, Institute for Human Movement Science, University of Hamburg, Hamburg, Germany
| | - Michael H. Thaut
- Music and Health Science Research Collaboratory, Faculty of Music, University of Toronto, Toronto, ON, Canada
| |
Collapse
|
71
|
Corrivetti F, de Schotten MT, Poisson I, Froelich S, Descoteaux M, Rheault F, Mandonnet E. Dissociating motor–speech from lexico-semantic systems in the left frontal lobe: insight from a series of 17 awake intraoperative mappings in glioma patients. Brain Struct Funct 2019; 224:1151-1165. [DOI: 10.1007/s00429-019-01827-7] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2018] [Accepted: 01/05/2019] [Indexed: 10/27/2022]
|
72
|
Panesar SS, Abhinav K, Yeh FC, Jacquesson T, Collins M, Fernandez-Miranda J. Tractography for Surgical Neuro-Oncology Planning: Towards a Gold Standard. Neurotherapeutics 2019; 16:36-51. [PMID: 30542904 PMCID: PMC6361069 DOI: 10.1007/s13311-018-00697-x] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Magnetic resonance imaging tractography permits in vivo visualization of white matter structures. Aside from its academic value, tractography has been proven particularly useful to neurosurgeons for preoperative planning. Preoperative tractography permits both qualitative and quantitative analyses of tumor effects upon surrounding white matter, allowing the surgeon to specifically tailor their operative approach. Despite its benefits, there is controversy pertaining to methodology, implementation, and interpretation of results in this context. High-definition fiber tractography (HDFT) is one of several non-tensor tractography approaches permitting visualization of crossing white matter trajectories at high resolutions, dispensing with the well-known shortcomings of diffusion tensor imaging (DTI) tractography. In this article, we provide an overview of the advantages of HDFT in a neurosurgical context, derived from our considerable experience implementing the technique for academic and clinical purposes. We highlight nuances of qualitative and quantitative approaches to using HDFT for brain tumor surgery planning, and integration of tractography with complementary operative adjuncts, and consider areas requiring further research.
Collapse
Affiliation(s)
- Sandip S Panesar
- Department of Neurosurgery, Stanford University, 300 Pasteur Drive, Palo Alto, CA, 94304, USA
| | - Kumar Abhinav
- Department of Neurosurgery, Stanford University, 300 Pasteur Drive, Palo Alto, CA, 94304, USA
| | - Fang-Cheng Yeh
- Department of Neurological Surgery, University of Pittsburgh, Pittsburgh, PA, USA
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA
| | - Timothée Jacquesson
- CHU de Lyon - Hôpital Neurologique et Neurochirurgical Pierre Wertheimer, Lyon, France
| | - Malie Collins
- Department of Neurosurgery, Stanford University, 300 Pasteur Drive, Palo Alto, CA, 94304, USA
| | - Juan Fernandez-Miranda
- Department of Neurosurgery, Stanford University, 300 Pasteur Drive, Palo Alto, CA, 94304, USA.
| |
Collapse
|
73
|
Structure, asymmetry, and connectivity of the human temporo-parietal aslant and vertical occipital fasciculi. Brain Struct Funct 2018; 224:907-923. [PMID: 30542766 DOI: 10.1007/s00429-018-1812-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Accepted: 12/04/2018] [Indexed: 10/27/2022]
Abstract
We previously proposed a bipartite 'dorsal-ventral' model of human arcuate fasciculus (AF) morphology. This model does not, however, account for the 'vertical,' temporo-parietal subdivision of the AF described in earlier dissection and tractographic studies. In an effort to address the absence of the vertical AF (VAF) within 'dorsal-ventral' nomenclature, we conducted a dedicated tractographic and white-matter dissection study of this tract and another short, vertical, posterior-hemispheric fascicle: the vertical occipital fasciculus (VOF). We conducted atlas-based, non-tensor, deterministic tractography in 30 single subjects from the Human Connectome Project database and verified our results using an average diffusion atlas compiled from 842 separate normal subjects. We also performed white-matter dissection in four post-mortem specimens. Our tractography results demonstrate that the VAF is, in fact, a bipartite system connecting the ventral parietal and temporal regions, with variable connective, and no volumetric lateralization. The VOF is a non-lateralized, non-segmented system connecting lateral occipital areas with basal-temporal regions. Importantly, the VOF was spatially dissociated from the VAF. As the VAF demonstrates no overall connective or volumetric lateralization, we postulate its distinction from the AF system and propose its re-naming to the 'temporo-parietal aslant tract,' (TPAT), with unique dorsal and ventral subdivisions. Our tractography results were supported by diffusion atlas and white-matter dissection findings.
Collapse
|
74
|
Rheault F, St-Onge E, Sidhu J, Maier-Hein K, Tzourio-Mazoyer N, Petit L, Descoteaux M. Bundle-specific tractography with incorporated anatomical and orientational priors. Neuroimage 2018; 186:382-398. [PMID: 30453031 DOI: 10.1016/j.neuroimage.2018.11.018] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Revised: 10/20/2018] [Accepted: 11/13/2018] [Indexed: 11/19/2022] Open
Abstract
Anatomical white matter bundles vary in shape, size, length, and complexity, making diffusion MRI tractography reconstruction of some bundles more difficult than others. As a result, bundles reconstruction often suffers from a poor spatial extent recovery. To fill-up the white matter volume as much and as best as possible, millions of streamlines can be generated and filtering techniques applied to address this issue. However, well-known problems and biases are introduced such as the creation of a large number of false positives and over-representation of easy-to-track parts of bundles and under-representation of hard-to-track. To address these challenges, we developed a Bundle-Specific Tractography (BST) algorithm. It incorporates anatomical and orientational prior knowledge during the process of streamline tracing to increase reproducibility, sensitivity, specificity and efficiency when reconstructing certain bundles of interest. BST outperforms classical deterministic, probabilistic, and global tractography methods. The increase in anatomically plausible streamlines, with larger spatial coverage, helps to accurately represent the full shape of bundles, which could greatly enhance and robustify tract-based and connectivity-based neuroimaging studies.
Collapse
Affiliation(s)
- Francois Rheault
- Sherbrooke Connectivity Imaging Laboratory (SCIL), Université de Sherbrooke, Canada.
| | - Etienne St-Onge
- Sherbrooke Connectivity Imaging Laboratory (SCIL), Université de Sherbrooke, Canada
| | - Jasmeen Sidhu
- Sherbrooke Connectivity Imaging Laboratory (SCIL), Université de Sherbrooke, Canada
| | - Klaus Maier-Hein
- Division of Medical Image Computing, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | | | - Laurent Petit
- Groupe d'Imagerie Neurofonctionnelle, IMN, UMR5293, CNRS, CEA, Université de Bordeaux, France
| | - Maxime Descoteaux
- Sherbrooke Connectivity Imaging Laboratory (SCIL), Université de Sherbrooke, Canada
| |
Collapse
|
75
|
Mandonnet E, Sarubbo S, Petit L. The Nomenclature of Human White Matter Association Pathways: Proposal for a Systematic Taxonomic Anatomical Classification. Front Neuroanat 2018; 12:94. [PMID: 30459566 PMCID: PMC6232419 DOI: 10.3389/fnana.2018.00094] [Citation(s) in RCA: 68] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Accepted: 10/17/2018] [Indexed: 12/27/2022] Open
Abstract
The heterogeneity and complexity of white matter (WM) pathways of the human brain were discretely described by pioneers such as Willis, Stenon, Malpighi, Vieussens and Vicq d'Azyr up to the beginning of the 19th century. Subsequently, novel approaches to the gross dissection of brain internal structures have led to a new understanding of WM organization, notably due to the works of Reil, Gall and Burdach highlighting the fascicular organization of WM. Meynert then proposed a definitive tripartite organization in association, commissural and projection WM pathways. The enduring anatomical work of Dejerine at the turn of the 20th century describing WM pathways in detail has been the paramount authority on this topic (including its terminology) for over a century, enriched sporadically by studies based on blunt Klingler dissection. Currently, diffusion-weighted magnetic resonance imaging (DWI) is used to reveal the WM fiber tracts of the human brain in vivo by measuring the diffusion of water molecules, especially along axons. It is then possible by tractography to reconstitute the WM pathways of the human brain step by step at an unprecedented level of precision in large cohorts. However, tractography algorithms, although powerful, still face the complexity of the organization of WM pathways, and there is a crucial need to benefit from the exact definitions of the trajectories and endings of all WM fascicles. Beyond such definitions, the emergence of DWI-based tractography has mostly revealed strong heterogeneity in naming the different bundles, especially the long-range association pathways. This review addresses the various terminologies known for the WM association bundles, aiming to describe the rules of arrangements followed by these bundles and to propose a new nomenclature based on the structural wiring diagram of the human brain.
Collapse
Affiliation(s)
| | - Silvio Sarubbo
- Division of Neurosurgery, Structural and Functional Connectivity Lab, Azienda Provinciale per i Servizi Sanitari (APSS), Trento, Italy
| | - Laurent Petit
- Groupe d’Imagerie Neurofonctionnelle, Institut des Maladies Neurodégénératives—UMR 5293, CNRS, CEA University of Bordeaux, Bordeaux, France
| |
Collapse
|
76
|
Vaquero L, Ramos-Escobar N, François C, Penhune V, Rodríguez-Fornells A. White-matter structural connectivity predicts short-term melody and rhythm learning in non-musicians. Neuroimage 2018; 181:252-262. [DOI: 10.1016/j.neuroimage.2018.06.054] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Revised: 05/28/2018] [Accepted: 06/18/2018] [Indexed: 12/20/2022] Open
|
77
|
Kambara T, Brown EC, Silverstein BH, Nakai Y, Asano E. Neural dynamics of verbal working memory in auditory description naming. Sci Rep 2018; 8:15868. [PMID: 30367077 PMCID: PMC6203730 DOI: 10.1038/s41598-018-33776-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Accepted: 10/06/2018] [Indexed: 11/24/2022] Open
Abstract
Auditory naming is suggested to require verbal working memory (WM) operations in addition to speech sound perception during the sentence listening period and semantic/syntactic processing during the subsequent judgement period. We attempted to dissect cortical activations attributable to verbal WM from those otherwise involved in answering auditory sentence questions. We studied 19 patients who underwent electrocorticography recordings and measured high-gamma activity during auditory naming and WM tasks. In the auditory naming task, inferior-precentral high-gamma activity was augmented during sentence listening, and the magnitude of augmentation was independently correlated to that during the WM task maintenance period as well as patient age. High-gamma augmentation during the WM task scanning period accounted for high-gamma variance during the naming task judgement period in some of the left frontal association neocortex regions (most significantly in the middle-frontal, less in the inferior-frontal, and least in the orbitofrontal gyrus). Inferior-frontal high-gamma augmentation was left-hemispheric dominant during naming task judgement but rather symmetric during WM scanning. Left orbitofrontal high-gamma augmentation was evident only during the naming task judgement period but minimal during the WM task scanning period. The inferior-precentral regions may exert WM maintenance during sentence listening, and such maintenance function may be gradually strengthened as the brain matures. The left frontal association neocortex may have a dorsal-to-ventral gradient in functional roles during naming task judgement. Namely, left middle-frontal activation may be well-attributable to WM scanning function, whereas left orbitofrontal activation may be attributable less to WM scanning but more largely to syntactic/semantic processing.
Collapse
Affiliation(s)
- Toshimune Kambara
- Department of Pediatrics, Children's Hospital of Michigan, Wayne State University, Detroit, MI, 48201, USA
- Postdoctoral Fellowship for Research Abroad, Japan Society for the Promotion of Science (JSPS), Chiyoda-ku, Tokyo, 1020083, Japan
- Department of Psychology, Hiroshima University, Hiroshima, 7398524, Japan
| | - Erik C Brown
- Department of Neurological Surgery, Oregon Health and Science University, Portland, OR, 97239, USA
| | - Brian H Silverstein
- Translational Neuroscience Program, Wayne State University, Detroit, MI, USA
| | - Yasuo Nakai
- Department of Pediatrics, Children's Hospital of Michigan, Wayne State University, Detroit, MI, 48201, USA
| | - Eishi Asano
- Department of Pediatrics, Children's Hospital of Michigan, Wayne State University, Detroit, MI, 48201, USA.
- Department of Neurology, Children's Hospital of Michigan, Wayne State University, Detroit, MI, 48201, USA.
| |
Collapse
|
78
|
Zacà D, Corsini F, Rozzanigo U, Dallabona M, Avesani P, Annicchiarico L, Zigiotto L, Faraca G, Chioffi F, Jovicich J, Sarubbo S. Whole-Brain Network Connectivity Underlying the Human Speech Articulation as Emerged Integrating Direct Electric Stimulation, Resting State fMRI and Tractography. Front Hum Neurosci 2018; 12:405. [PMID: 30364298 PMCID: PMC6193478 DOI: 10.3389/fnhum.2018.00405] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2018] [Accepted: 09/20/2018] [Indexed: 11/16/2022] Open
Abstract
Production of fluent speech in humans is based on a precise and coordinated articulation of sounds. A speech articulation network (SAN) has been observed in multiple brain studies typically using either neuroimaging or direct electrical stimulation (DES), thus giving limited knowledge about the whole brain structural and functional organization of this network. In this study, seven right-handed patients underwent awake surgery resection of low-grade gliomas (4) and cavernous angiomas. We combined pre-surgical resting state fMRI (rs-fMRI) and diffusion MRI together with speech arrest sites obtained intra-operatively with DES to address the following goals: (i) determine the cortical areas contributing to the intrinsic functional SAN using the speech arrest sites as functional seeds for rs-fMRI; (ii) evaluate the relative contribution of gray matter terminations from the two major language dorsal stream bundles, the superior longitudinal fasciculus (SLF III) and the arcuate fasciculus (AF); and (iii) evaluate the possible pre-surgical prediction of SAN with rs-fMRI. In all these right-handed patients the intrinsic functional SAN included frontal, inferior parietal, temporal, and insular regions symmetrically and bilaterally distributed across the two hemispheres regardless of the side (four right) of speech arrest evocation. The SLF III provided a much higher density of terminations in the cortical regions of SAN in respect to AF. Pre-surgical rs-fMRI data demonstrated moderate ability to predict the SAN. The set of functional and structural data provided in this multimodal study characterized, at a whole-brain level, a distributed and bi-hemispherical network subserving speech articulation.
Collapse
Affiliation(s)
- Domenico Zacà
- Center for Mind/Brain Sciences (CIMeC), University of Trento, Trento, Italy
| | - Francesco Corsini
- Division of Neurosurgery, "S. Chiara" Hospital, Azienda Provinciale per i Servizi Sanitari, Trento, Italy.,Structural and Functional Connectivity Lab (SFC-Lab) Project, Division of Neurosurgery, "S. Chiara" Hospital, Azienda Provinciale per i Servizi Sanitari, Trento, Italy
| | - Umberto Rozzanigo
- Department of Radiology, Neuroradiology Unit, "S. Chiara" Hospital, Azienda Provinciale per i Servizi Sanitari, Trento, Italy
| | - Monica Dallabona
- Division of Neurosurgery, "S. Chiara" Hospital, Azienda Provinciale per i Servizi Sanitari, Trento, Italy
| | - Paolo Avesani
- NiLab, Bruno Kessler Foundation - FBK, Trento, Italy
| | - Luciano Annicchiarico
- Division of Neurosurgery, "S. Chiara" Hospital, Azienda Provinciale per i Servizi Sanitari, Trento, Italy.,Department of Neurosciences, Biomedicine and Movement Sciences, Section of Neurosurgery, University of Verona, Verona, Italy
| | - Luca Zigiotto
- Division of Neurosurgery, "S. Chiara" Hospital, Azienda Provinciale per i Servizi Sanitari, Trento, Italy
| | - Giovanna Faraca
- Division of Neurosurgery, "S. Chiara" Hospital, Azienda Provinciale per i Servizi Sanitari, Trento, Italy
| | - Franco Chioffi
- Division of Neurosurgery, "S. Chiara" Hospital, Azienda Provinciale per i Servizi Sanitari, Trento, Italy.,Structural and Functional Connectivity Lab (SFC-Lab) Project, Division of Neurosurgery, "S. Chiara" Hospital, Azienda Provinciale per i Servizi Sanitari, Trento, Italy
| | - Jorge Jovicich
- Center for Mind/Brain Sciences (CIMeC), University of Trento, Trento, Italy
| | - Silvio Sarubbo
- Division of Neurosurgery, "S. Chiara" Hospital, Azienda Provinciale per i Servizi Sanitari, Trento, Italy.,Structural and Functional Connectivity Lab (SFC-Lab) Project, Division of Neurosurgery, "S. Chiara" Hospital, Azienda Provinciale per i Servizi Sanitari, Trento, Italy
| |
Collapse
|
79
|
Sammler D, Cunitz K, Gierhan SME, Anwander A, Adermann J, Meixensberger J, Friederici AD. White matter pathways for prosodic structure building: A case study. BRAIN AND LANGUAGE 2018; 183:1-10. [PMID: 29758365 DOI: 10.1016/j.bandl.2018.05.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2017] [Revised: 03/14/2018] [Accepted: 05/03/2018] [Indexed: 06/08/2023]
Abstract
The relevance of left dorsal and ventral fiber pathways for syntactic and semantic comprehension is well established, while pathways for prosody are little explored. The present study examined linguistic prosodic structure building in a patient whose right arcuate/superior longitudinal fascicles and posterior corpus callosum were transiently compromised by a vasogenic peritumoral edema. Compared to ten matched healthy controls, the patient's ability to detect irregular prosodic structure significantly improved between pre- and post-surgical assessment. This recovery was accompanied by an increase in average fractional anisotropy (FA) in right dorsal and posterior transcallosal fiber tracts. Neither general cognitive abilities nor (non-prosodic) syntactic comprehension nor FA in right ventral and left dorsal fiber tracts showed a similar pre-post increase. Together, these findings suggest a contribution of right dorsal and inter-hemispheric pathways to prosody perception, including the right-dorsal tracking and structuring of prosodic pitch contours that is transcallosally informed by concurrent syntactic information.
Collapse
Affiliation(s)
- Daniela Sammler
- Otto Hahn Group "Neural Bases of Intonation in Speech and Music", Max Planck Institute for Human Cognitive and Brain Sciences, Stephanstraße 1a, 04103 Leipzig, Germany; Department of Neuropsychology, Max Planck Institute for Human Cognitive and Brain Sciences, Stephanstraße 1a, 04103 Leipzig, Germany.
| | - Katrin Cunitz
- Department of Neuropsychology, Max Planck Institute for Human Cognitive and Brain Sciences, Stephanstraße 1a, 04103 Leipzig, Germany; Department of Child and Adolescent Psychiatry and Psychotherapy, University Hospital Ulm, Steinhövelstraße 5, 89075 Ulm, Germany
| | - Sarah M E Gierhan
- Department of Neuropsychology, Max Planck Institute for Human Cognitive and Brain Sciences, Stephanstraße 1a, 04103 Leipzig, Germany; Berlin School of Mind and Brain, Humboldt University Berlin, Unter den Linden 6, 10099 Berlin, Germany
| | - Alfred Anwander
- Department of Neuropsychology, Max Planck Institute for Human Cognitive and Brain Sciences, Stephanstraße 1a, 04103 Leipzig, Germany
| | - Jens Adermann
- University Hospital Leipzig, Clinic and Policlinic for Neurosurgery, Liebigstraße 20, 04103 Leipzig, Germany
| | - Jürgen Meixensberger
- University Hospital Leipzig, Clinic and Policlinic for Neurosurgery, Liebigstraße 20, 04103 Leipzig, Germany
| | - Angela D Friederici
- Department of Neuropsychology, Max Planck Institute for Human Cognitive and Brain Sciences, Stephanstraße 1a, 04103 Leipzig, Germany; Berlin School of Mind and Brain, Humboldt University Berlin, Unter den Linden 6, 10099 Berlin, Germany
| |
Collapse
|
80
|
Thaut MH, Rice RR, Braun Janzen T, Hurt-Thaut CP, McIntosh GC. Rhythmic auditory stimulation for reduction of falls in Parkinson's disease: a randomized controlled study. Clin Rehabil 2018; 33:34-43. [PMID: 30033755 DOI: 10.1177/0269215518788615] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
OBJECTIVE: To test whether rhythmic auditory stimulation (RAS) training reduces the number of falls in Parkinson's disease patients with a history of frequent falls. DESIGN: Randomized withdrawal study design. SUBJECTS: A total of 60 participants (aged 62-82 years) diagnosed with idiopathic Parkinson's disease (Hoehn and Yahr stages III or IV) with at least two falls in the past 12 months. INTERVENTION: Participants were randomly allocated to two groups and completed 30 minutes of daily home-based gait training with metronome click-embedded music. The experimental group completed 24 weeks of RAS training, whereas the control group discontinued RAS training between weeks 8 and 16. MAIN MEASURES: Changes in clinical and kinematic parameters were assessed at baseline, weeks 8, 16, and 24. RESULTS: Both groups improved significantly at week 8. At week 16-after the control group had discontinued training-significant differences between groups emerged including a rise in the fall index for the control group ( M = 10, SD = 6). Resumption of training reduced the number of falls so that group differences were no longer significant at week 24 ( Mexperimental = 3, SD = 2.6; Mcontrol = 5, SD = 4.4; P > 0.05). Bilateral ankle dorsiflexion was significantly correlated with changes in gait, fear of falling, and the fall index, indicating ankle flexion as a potential kinematic mechanism RAS addresses to reduce falls. CONCLUSION: RAS training significantly reduced the number of falls in Parkinson's disease and modified key gait parameters, such as velocity and stride length.
Collapse
Affiliation(s)
- Michael H Thaut
- 1 Music and Health Science Research Collaboratory, Faculty of Music, University of Toronto, Toronto, ON, Canada
| | - Ruth R Rice
- 2 Center for Research in Neurorehabilitation, Poudre Valley Hospital, University of Colorado Health, Fort Collins, CO, USA
| | - Thenille Braun Janzen
- 1 Music and Health Science Research Collaboratory, Faculty of Music, University of Toronto, Toronto, ON, Canada
| | - Corene P Hurt-Thaut
- 1 Music and Health Science Research Collaboratory, Faculty of Music, University of Toronto, Toronto, ON, Canada
| | - Gerald C McIntosh
- 2 Center for Research in Neurorehabilitation, Poudre Valley Hospital, University of Colorado Health, Fort Collins, CO, USA
| |
Collapse
|
81
|
Panesar SS, Yeh FC, Jacquesson T, Hula W, Fernandez-Miranda JC. A Quantitative Tractography Study Into the Connectivity, Segmentation and Laterality of the Human Inferior Longitudinal Fasciculus. Front Neuroanat 2018; 12:47. [PMID: 29922132 PMCID: PMC5996125 DOI: 10.3389/fnana.2018.00047] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2018] [Accepted: 05/18/2018] [Indexed: 11/13/2022] Open
Abstract
The human inferior longitudinal fasciculus (ILF) is a ventral, temporo-occipital association tract. Though described in early neuroanatomical works, its existence was later questioned. Application of in vivo tractography to the neuroanatomical study of the ILF has generally confirmed its existence, however, consensus is lacking regarding its subdivision, laterality and connectivity. Further, there is a paucity of detailed neuroanatomic data pertaining to the exact anatomy of the ILF. Generalized Q-Sampling imaging (GQI) is a non-tensor tractographic modality permitting high resolution imaging of white-matter structures. As it is a non-tensor modality, it permits visualization of crossing fibers and accurate delineation of close-proximity fiber-systems. We applied deterministic GQI tractography to data from 30 healthy subjects and a large-volume, averaged diffusion atlas, to delineate ILF anatomy. Post-mortem white matter dissection was also carried out in three cadaveric specimens for further validation. The ILF was found in all 60 hemispheres. At its occipital extremity, ILF fascicles demonstrated a bifurcated, ventral-dorsal morphological termination pattern, which we used to further subdivide the bundle for detailed analysis. These divisions were consistent across the subject set and within the atlas. We applied quantitative techniques to study connectivity strength of the ILF at its anterior and posterior extremities. Overall, both morphological divisions, and the un-separated ILF, demonstrated strong leftward-lateralized connectivity patterns. Leftward-lateralization was also found for ILF volumes across the subject set. Due to connective and volumetric leftward-dominance and ventral location, we postulate the ILFs role in the semantic system. Further, our results are in agreement with functional and lesion-based postulations pertaining to the ILFs role in facial recognition.
Collapse
Affiliation(s)
- Sandip S Panesar
- Department of Neurological Surgery, University of Pittsburgh, Pittsburgh, PA, United States
| | - Fang-Cheng Yeh
- Department of Neurological Surgery, University of Pittsburgh, Pittsburgh, PA, United States.,Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, United States
| | - Timothée Jacquesson
- Department of Neurological Surgery, University of Pittsburgh, Pittsburgh, PA, United States
| | - William Hula
- Veterans Affairs Pittsburgh Healthcare System, Pittsburgh, PA, United States
| | | |
Collapse
|
82
|
Yeh FC, Panesar S, Fernandes D, Meola A, Yoshino M, Fernandez-Miranda JC, Vettel JM, Verstynen T. Population-averaged atlas of the macroscale human structural connectome and its network topology. Neuroimage 2018; 178:57-68. [PMID: 29758339 DOI: 10.1016/j.neuroimage.2018.05.027] [Citation(s) in RCA: 342] [Impact Index Per Article: 57.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Revised: 04/03/2018] [Accepted: 05/09/2018] [Indexed: 11/27/2022] Open
Abstract
A comprehensive map of the structural connectome in the human brain has been a coveted resource for understanding macroscopic brain networks. Here we report an expert-vetted, population-averaged atlas of the structural connectome derived from diffusion MRI data (N = 842). This was achieved by creating a high-resolution template of diffusion patterns averaged across individual subjects and using tractography to generate 550,000 trajectories of representative white matter fascicles annotated by 80 anatomical labels. The trajectories were subsequently clustered and labeled by a team of experienced neuroanatomists in order to conform to prior neuroanatomical knowledge. A multi-level network topology was then described using whole-brain connectograms, with subdivisions of the association pathways showing small-worldness in intra-hemisphere connections, projection pathways showing hub structures at thalamus, putamen, and brainstem, and commissural pathways showing bridges connecting cerebral hemispheres to provide global efficiency. This atlas of the structural connectome provides representative organization of human brain white matter, complementary to traditional histologically-derived and voxel-based white matter atlases, allowing for better modeling and simulation of brain connectivity for future connectome studies.
Collapse
Affiliation(s)
- Fang-Cheng Yeh
- Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA, USA; Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA.
| | - Sandip Panesar
- Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA, USA
| | - David Fernandes
- Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA, USA
| | - Antonio Meola
- Department of Neurosurgery, Stanford University, Stanford, CA, USA
| | | | - Juan C Fernandez-Miranda
- Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA, USA
| | - Jean M Vettel
- U.S. Army Research Laboratory, Aberdeen Proving Ground, Aberdeen, MD, USA; Department of Psychological and Brain Sciences, University of California, Santa Barbara, Santa Barbara, CA, USA; Department of Bioengineering, University of Pennsylvania, Philadelphia, PA, USA
| | - Timothy Verstynen
- Department of Psychology and Center for the Neural Basis of Cognition, Carnegie Mellon University, Pennsylvania, USA.
| |
Collapse
|
83
|
Sun C, Wang Y, Cui R, Wu C, Li X, Bao Y, Wang Y. Human Thalamic-Prefrontal Peduncle Connectivity Revealed by Diffusion Spectrum Imaging Fiber Tracking. Front Neuroanat 2018; 12:24. [PMID: 29719502 PMCID: PMC5913328 DOI: 10.3389/fnana.2018.00024] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Accepted: 03/15/2018] [Indexed: 12/16/2022] Open
Abstract
The thalamic-prefrontal peduncle (TPP) is a large bundle connecting the thalamus and prefrontal cortex. The definitive structure and function of the TPP are still controversial. To investigate the connectivity and segmentation patterns of the TPP, we employed diffusion spectrum imaging with generalized q-sampling reconstruction to perform both subject-specific and template-based analyses. Our results confirmed the trajectory and spatial relationship of the TPP in the human brain and identified the connection areas in the prefrontal cortex. The TPP-connecting areas identified based on Brodmann areas (BAs) were BAs 8–11 and 45–47. Based on the automated anatomical atlas, these areas were the medial superior frontal gyrus, superior frontal gyrus, middle frontal gyrus, pars triangularis, pars orbitalis, anterior orbital gyrus, and lateral orbital gyrus. In addition, we identified the TPP connection areas in the thalamus, including the anterior and medial nuclei, and the lateral dorsal/lateral posterior nuclei. TPP fibers connected the thalamus with the ipsilateral prefrontal BAs 11, 47, 10, 46, 45, 9, and 8 seriatim from medial to lateral, layer by layer. Our results provide further details of the thalamic-prefrontal peduncle structure, and may aid future studies and a better understanding of the functional roles of the TPP in the human brain.
Collapse
Affiliation(s)
- Chuanqi Sun
- Department of Innovative Medical Photonics, Preeminent Medical Photonics Education & Research Center, Institute for Photonics Research, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Yibao Wang
- Department of Neurosurgery, First Affiliated Hospital of China Medical University, Shenyang, China
| | - Run Cui
- Department of Neurosurgery, First Affiliated Hospital of China Medical University, Shenyang, China
| | - Chong Wu
- Department of Neurosurgery, Anshan Central Hospital, Anshan, China
| | - Xinguo Li
- Department of Neurosurgery, First Affiliated Hospital of China Medical University, Shenyang, China
| | - Yue Bao
- Department of Neurosurgery, First Affiliated Hospital of China Medical University, Shenyang, China
| | - Yong Wang
- Department of Neurosurgery, First Affiliated Hospital of China Medical University, Shenyang, China
| |
Collapse
|
84
|
De Benedictis A, Nocerino E, Menna F, Remondino F, Barbareschi M, Rozzanigo U, Corsini F, Olivetti E, Marras CE, Chioffi F, Avesani P, Sarubbo S. Photogrammetry of the Human Brain: A Novel Method for Three-Dimensional Quantitative Exploration of the Structural Connectivity in Neurosurgery and Neurosciences. World Neurosurg 2018; 115:e279-e291. [PMID: 29660551 DOI: 10.1016/j.wneu.2018.04.036] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Accepted: 04/05/2018] [Indexed: 01/23/2023]
Abstract
BACKGROUND Anatomic awareness of the structural connectivity of the brain is mandatory for neurosurgeons, to select the most effective approaches for brain resections. Although standard microdissection is a validated technique to investigate the different white matter (WM) pathways and to verify the results of tractography, the possibility of interactive exploration of the specimens and reliable acquisition of quantitative information has not been described. Photogrammetry is a well-established technique allowing an accurate metrology on highly defined three-dimensional (3D) models. The aim of this work is to propose the application of the photogrammetric technique for supporting the 3D exploration and the quantitative analysis on the cerebral WM connectivity. METHODS The main perisylvian pathways, including the superior longitudinal fascicle and the arcuate fascicle were exposed using the Klingler technique. The photogrammetric acquisition followed each dissection step. The point clouds were registered to a reference magnetic resonance image of the specimen. All the acquisitions were coregistered into an open-source model. RESULTS We analyzed 5 steps, including the cortical surface, the short intergyral fibers, the indirect posterior and anterior superior longitudinal fascicle, and the arcuate fascicle. The coregistration between the magnetic resonance imaging mesh and the point clouds models was highly accurate. Multiple measures of distances between specific cortical landmarks and WM tracts were collected on the photogrammetric model. CONCLUSIONS Photogrammetry allows an accurate 3D reproduction of WM anatomy and the acquisition of unlimited quantitative data directly on the real specimen during the postdissection analysis. These results open many new promising neuroscientific and educational perspectives and also optimize the quality of neurosurgical treatments.
Collapse
Affiliation(s)
- Alessandro De Benedictis
- Neurosurgery Unit, Department of Neuroscience and Neurorehabilitation, Bambino Gesù Children's Hospital, IRCCS, Roma, Italy.
| | - Erica Nocerino
- Theoretical Physics ETH Zürich, Zurich, Switzerland; LSIS Laboratory-Laboratoire des Sciences de l'Information et des Systèmes, I&M Team, Images & Models AMU, Aix-Marseille Université POLYTECH, Marseille, France
| | - Fabio Menna
- 3D Optical Metrology (3DOM) Unit, Bruno Kessler Foundation (FBK), Trento, Italy
| | - Fabio Remondino
- 3D Optical Metrology (3DOM) Unit, Bruno Kessler Foundation (FBK), Trento, Italy
| | | | - Umberto Rozzanigo
- Department of Radiology, Neuroradiology Unit, "S. Chiara" Hospital, Trento APSS, Italy
| | - Francesco Corsini
- Division of Neurosurgery, Structural and Functional Connectivity (SFC) Lab Project, "S. Chiara" Hospital, Trento APSS, Italy
| | - Emanuele Olivetti
- Neuroinformatics Laboratory (NILab), Bruno Kessler Foundation, Trento, Italy; Center for Mind/Brain Science (CIMeC), University of Trento, Mattarello (TN), Italy
| | - Carlo Efisio Marras
- Neurosurgery Unit, Department of Neuroscience and Neurorehabilitation, Bambino Gesù Children's Hospital, IRCCS, Roma, Italy
| | - Franco Chioffi
- Division of Neurosurgery, Structural and Functional Connectivity (SFC) Lab Project, "S. Chiara" Hospital, Trento APSS, Italy
| | - Paolo Avesani
- Neuroinformatics Laboratory (NILab), Bruno Kessler Foundation, Trento, Italy; Center for Mind/Brain Science (CIMeC), University of Trento, Mattarello (TN), Italy
| | - Silvio Sarubbo
- Division of Neurosurgery, Structural and Functional Connectivity (SFC) Lab Project, "S. Chiara" Hospital, Trento APSS, Italy
| |
Collapse
|
85
|
Fernandes Cabral DT, Zenonos GA, Nuñez M, Celtikci P, Snyderman C, Wang E, Gardner PA, Fernandez-Miranda JC. Endoscopic Endonasal Transclival Approach for Resection of a Pontine Glioma: Surgical Planning, Surgical Anatomy, and Technique. Oper Neurosurg (Hagerstown) 2018. [DOI: 10.1093/ons/opy005] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
BACKGROUND
The endoscopic endonasal approach (EEA) has been proposed as a potential alternative for ventral brainstem lesions. The surgical anatomy, feasibility, and limitations of the EEA for intrinsic brainstem lesions are still poorly understood.
OBJECTIVE
To describe the surgical planning, anatomy, and technique of an intrinsic pontine glioma operated via EEA.
METHODS
Six-human brainstems were prepared for white matter microdissection. Ten healthy subjects were studied with high-definition fiber tractography (HDFT). A 56-yr-old female with right-hemiparesis underwent EEA for an exophytic pontine glioma. Pre- and postoperative HDFTs were implemented.
RESULTS
The corticospinal tracts (CSTs) are the most eloquent fibers in the ventral brainstem. At the pons, CSTs run between the pontine nuclei and the middle cerebellar peduncle (MCP). At the lower medulla, the pyramidal decussation leaves no room for safe ventral access. In our illustrative case, preoperative HDFT showed left-CST displaced posteromedially and partially disrupted, right-CST posteriorly displaced, and MCP severely disrupted. A transclival exposure was performed achieving a complete resection of the exophytic component with residual intra-axial tumor. Immediately postop, patient developed new left-side abducens nerve palsy and worse right-hemiparesis. Ten days postop, her strength returned to baseline. HDFT showed preservation and trajectory restoration of the CSTs.
CONCLUSION
The EEA provides direct access to the ventral brainstem, overcoming the limitations of lateral approaches. For intrinsic pathology, HDFT helps choosing the most appropriate surgical route/boundaries for safer resection. Further experience is needed to determine the indications and limitations of this approach that should be performed by neurosurgeons with high-level expertise in EEA.
Collapse
Affiliation(s)
- David T Fernandes Cabral
- Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
| | - Georgios A Zenonos
- Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
| | - Maximiliano Nuñez
- Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
| | - Pinar Celtikci
- Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
| | - Carl Snyderman
- Department of Otolaryngology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
| | - Eric Wang
- Department of Otolaryngology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
| | - Paul A Gardner
- Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
| | - Juan C Fernandez-Miranda
- Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
| |
Collapse
|
86
|
Bauer CM, Cattaneo Z, Merabet LB. Early blindness is associated with increased volume of the uncinate fasciculus. Eur J Neurosci 2018; 47:427-432. [PMID: 29380459 DOI: 10.1111/ejn.13848] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2017] [Revised: 01/08/2018] [Accepted: 01/15/2018] [Indexed: 12/13/2022]
Abstract
Growing evidence demonstrates dramatic structural and functional neuroplastic changes in individuals born with early-onset blindness. For example, cross-modal sensory processing at the level of the occipital cortex appears to be associated with adaptive behaviors in the blind. However, detailed studies examining the structural properties of key white matter pathways in other regions of the brain remain limited. Given that blind individuals rely heavily on their sense of hearing, we examined the structural properties of two important pathways involved with auditory processing, namely the uncinate and arcuate fasciculi. High angular resolution diffusion imaging (HARDI) tractography was used to examine structural parameters (i.e., tract volume and quantitative anisotropy, or QA) of these two fasciculi in a sample of 13 early blind individuals and 14 normally sighted controls. Compared to controls, early blind individuals showed a significant increase in the volume of the left uncinate fasciculus. A small area of increased QA was also observed halfway along the right arcuate fasciculus in the blind group. These findings contribute to our knowledge regarding the broad neuroplastic changes associated with profound early blindness.
Collapse
Affiliation(s)
- Corinna M Bauer
- Laboratory for Visual Neuroplasticity, Department of Ophthalmology, Massachusetts Eye and Ear Infirmary, Harvard Medical School, 20 Staniford Street, Boston, MA, 02114, USA
| | - Zaira Cattaneo
- Department of Psychology, University of Milano-Biococca, Milan, Italy.,Brain Connectivity Center, IRCCS Mondino Foundation, Pavia, Italy
| | - Lotfi B Merabet
- Laboratory for Visual Neuroplasticity, Department of Ophthalmology, Massachusetts Eye and Ear Infirmary, Harvard Medical School, 20 Staniford Street, Boston, MA, 02114, USA
| |
Collapse
|
87
|
Vassal F, Pommier B, Sontheimer A, Lemaire JJ. Inter-individual variations and hemispheric asymmetries in structural connectivity patterns of the inferior fronto-occipital fascicle: a diffusion tensor imaging tractography study. Surg Radiol Anat 2017; 40:129-137. [PMID: 29285657 DOI: 10.1007/s00276-017-1966-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Accepted: 12/20/2017] [Indexed: 10/18/2022]
Abstract
PURPOSE Precise knowledge of the structural connectivity of white matter fascicles could yield new insights into function and is important for neurosurgical planning. Therefore, we aimed to provide a detailed map of the cortical terminations of the inferior fronto-occipital fascicle (IFOF), with special emphasis on putative inter-individual variations and hemispheric asymmetries. METHODS Deterministic diffusion tensor imaging-based tractography was used to perform virtual dissection of the IFOF in 20 healthy subjects. The IFOF was probed from a single seed region of interest placed within the external/extreme capsule, i.e. the white matter region of "obligatory passage" along the known path of the IFOF. This enabled to reconstruct all the fibers belonging to the IFOF and to provide the complete map of their cortical terminations. RESULTS We observed widespread projections over a total of 11 cortical territories within the occipital, parietal, temporal and frontal lobes. Importantly, compared to previous studies we consistently found some inter-individual variability with several distinct patterns connecting subsets of the 11 cortical territories, and tangible differences between the two hemispheres. IFOF terminations within the superior parietal lobule were rightward lateralized, whereas terminations within the inferior frontal gyrus were leftward lateralized. CONCLUSIONS Our results provide a clinically relevant map of IFOF's cortical terminations, including intra- and inter-individual variations. Right-left differences in connectivity patterns might be related to known functional asymmetries in the human brain, and reinforce the general evidence that the IFOF likely supports distinct clinical features and functional roles according to the (affected) hemisphere, such as language and spatial attention.
Collapse
Affiliation(s)
- François Vassal
- IGCNC (Image-Guided Clinical Neuroscience and Connectomics), CNRS, Sigma, Institut Pascal, UMR 6602, Université d'Auvergne, Clermont-Ferrand, France. .,Service de Neurochirurgie, Hôpital Nord, Centre Hospitalier Universitaire, Saint-Etienne, France. .,Department of Neurosurgery, University Hospital of Saint-Etienne, Saint-Etienne, France.
| | - Benjamin Pommier
- Service de Neurochirurgie, Hôpital Nord, Centre Hospitalier Universitaire, Saint-Etienne, France
| | - Anna Sontheimer
- IGCNC (Image-Guided Clinical Neuroscience and Connectomics), CNRS, Sigma, Institut Pascal, UMR 6602, Université d'Auvergne, Clermont-Ferrand, France.,Service de Neurochirurgie, Hôpital Gabriel Montpied, Centre Hospitalier Universitaire, Clermont-Ferrand, France
| | - Jean-Jacques Lemaire
- IGCNC (Image-Guided Clinical Neuroscience and Connectomics), CNRS, Sigma, Institut Pascal, UMR 6602, Université d'Auvergne, Clermont-Ferrand, France.,Service de Neurochirurgie, Hôpital Gabriel Montpied, Centre Hospitalier Universitaire, Clermont-Ferrand, France
| |
Collapse
|
88
|
Bao Y, Wang Y, Wang W, Wang Y. The Superior Fronto-Occipital Fasciculus in the Human Brain Revealed by Diffusion Spectrum Imaging Tractography: An Anatomical Reality or a Methodological Artifact? Front Neuroanat 2017; 11:119. [PMID: 29321729 PMCID: PMC5733543 DOI: 10.3389/fnana.2017.00119] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2017] [Accepted: 11/27/2017] [Indexed: 12/23/2022] Open
Abstract
The existence of the superior fronto-occipital fasciculus (SFOF) in the human brain remains controversial. The aim of the present study was to clarify the existence, course, and terminations of the SFOF. High angular diffusion spectrum imaging (DSI) analysis was performed on six healthy adults and on a template of 842 subjects from the Human Connectome Project. To verify tractography results, we performed fiber microdissections of four post-mortem human brains. Based on DSI tractography, we reconstructed the SFOF in the subjects and the template from the Human Connectome Project that originated from the rostral and medial parts of the superior and middle frontal gyri. By tractography, we found that the fibers formed a compact fascicle at the level of the anterior horn of the lateral ventricle coursing above the head of caudate nucleus, medial to the corona radiate and under the corpus callosum (CC), and terminated at the parietal region via the lower part of the caudate nucleus. We consider that this fiber bundle observed by tractography is the SFOF, although it terminates mainly at the parietal region, rather than occipital lobe. By contrast, we were unable to identify a fiber bundle corresponding to the SFOF in our fiber dissection study. Although we did not provide definite evidence of the SFOF in the human brain, these findings may be useful for future studies in this field.
Collapse
Affiliation(s)
- Yue Bao
- Department of Neurosurgery, The First Affiliated Hospital of China Medical University, Shenyang, China
| | - Yong Wang
- Department of Neurosurgery, The First Affiliated Hospital of China Medical University, Shenyang, China
| | - Wei Wang
- Department of Neurosurgery, The First Affiliated Hospital of China Medical University, Shenyang, China
| | - Yibao Wang
- Department of Neurosurgery, The First Affiliated Hospital of China Medical University, Shenyang, China
| |
Collapse
|
89
|
Wei K, Cieslak M, Greene C, Grafton ST, Carlson JM. Sensitivity analysis of human brain structural network construction. Netw Neurosci 2017; 1:446-467. [PMID: 30090874 PMCID: PMC6063716 DOI: 10.1162/netn_a_00025] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2017] [Accepted: 09/04/2017] [Indexed: 12/03/2022] Open
Abstract
Network neuroscience leverages diffusion-weighted magnetic resonance imaging and tractography to quantify structural connectivity of the human brain. However, scientists and practitioners lack a clear understanding of the effects of varying tractography parameters on the constructed structural networks. With diffusion images from the Human Connectome Project (HCP), we characterize how structural networks are impacted by the spatial resolution of brain atlases, total number of tractography streamlines, and grey matter dilation with various graph metrics. We demonstrate how injudicious combinations of highly refined brain parcellations and low numbers of streamlines may inadvertently lead to disconnected network models with isolated nodes. Furthermore, we provide solutions to significantly reduce the likelihood of generating disconnected networks. In addition, for different tractography parameters, we investigate the distributions of values taken by various graph metrics across the population of HCP subjects. Analyzing the ranks of individual subjects within the graph metric distributions, we find that the ranks of individuals are affected differently by atlas scale changes. Our work serves as a guideline for researchers to optimize the selection of tractography parameters and illustrates how biological characteristics of the brain derived in network neuroscience studies can be affected by the choice of atlas parcellation schemes. Diffusion tractography has been proven to be a promising noninvasive technique to study the network properties of the human brain. However, how various tractography and network construction parameters affect network properties has not been studied using a large cohort of high-quality data. We utilize data provided by the Human Connectome Project to characterize the changes to network properties induced by varying the brain parcellation atlas scales, the number of reconstructed tractography tracks, and the degree of grey matter dilation with graph metrics. We illustrate the importance of increasing the reconstructed track sampling rate when higher atlas scales are used. In addition to changing the raw values of graph metrics, we find that the ranks of individuals relative to the population metric distributions are altered. We further discuss how the dependency of graph metric ranks can affect the brain characteristics derived in group comparison studies using network neuroscience techniques.
Collapse
Affiliation(s)
- Kuang Wei
- Department of Physics, University of Chicago, Chicago, IL, USA.,Department of Physics, University of California, Santa Barbara, CA, USA
| | - Matthew Cieslak
- Department of Psychological and Brain Sciences, University of California, Santa Barbara, CA, USA
| | - Clint Greene
- Department of Electrical and Computer Engineering, University of California, Santa Barbara, CA, USA
| | - Scott T Grafton
- Department of Psychological and Brain Sciences, University of California, Santa Barbara, CA, USA
| | - Jean M Carlson
- Department of Physics, University of California, Santa Barbara, CA, USA
| |
Collapse
|
90
|
Wright AK, Theilmann RJ, Ridgway SH, Scadeng M. Diffusion tractography reveals pervasive asymmetry of cerebral white matter tracts in the bottlenose dolphin (Tursiops truncatus). Brain Struct Funct 2017; 223:1697-1711. [PMID: 29189908 PMCID: PMC5884918 DOI: 10.1007/s00429-017-1525-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Accepted: 07/06/2017] [Indexed: 12/18/2022]
Abstract
Brain enlargement is associated with concomitant growth of interneuronal distance, increased conduction time, and reduced neuronal interconnectivity. Recognition of these functional constraints led to the hypothesis that large-brained mammals should exhibit greater structural and functional brain lateralization. As a taxon with the largest brains in the animal kingdom, Cetacea provides a unique opportunity to examine asymmetries of brain structure and function. In the present study, diffusion tensor imaging and tractography were used to investigate cerebral white matter asymmetry in the bottlenose dolphin (Tursiops truncatus). Widespread white matter asymmetries were observed with the preponderance of tracts exhibiting leftward structural asymmetries. Leftward lateralization may reflect differential processing and execution of behaviorally variant sensory and motor functions by the cerebral hemispheres. The arcuate fasciculus, an association tract linked to human language evolution, was isolated and exhibited rightward asymmetry suggesting a right hemisphere bias for conspecific communication unlike that of most mammals. This study represents the first examination of cetacean white matter asymmetry and constitutes an important step toward understanding potential drivers of structural asymmetry and its role in underpinning functional and behavioral lateralization in cetaceans.
Collapse
Affiliation(s)
- Alexandra K Wright
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California-San Diego, La Jolla, CA, 92093, USA.
| | - Rebecca J Theilmann
- Department of Radiology, University of California-San Diego, La Jolla, CA, 92093, USA
| | - Sam H Ridgway
- National Marine Mammal Foundation, San Diego, CA, 92106, USA
| | - Miriam Scadeng
- Center for Functional MRI, Department of Radiology, University of California-San Diego, La Jolla, CA, 92093, USA
| |
Collapse
|
91
|
Yoshino M, Abhinav K, Yeh FC, Panesar S, Fernandes D, Pathak S, Gardner PA, Fernandez-Miranda JC. Visualization of Cranial Nerves Using High-Definition Fiber Tractography. Neurosurgery 2017; 79:146-65. [PMID: 27070917 DOI: 10.1227/neu.0000000000001241] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Recent studies have demonstrated diffusion tensor imaging tractography of cranial nerves (CNs). Spatial and angular resolution, however, is limited with this modality. A substantial improvement in image resolution can be achieved with high-angle diffusion magnetic resonance imaging and atlas-based fiber tracking to provide detailed trajectories of CNs. OBJECTIVE To use high-definition fiber tractography to identify CNs in healthy subjects and patients with brain tumors. METHODS Five neurologically healthy adults and 3 patients with brain tumors were scanned with diffusion spectrum imaging that allowed high-angular-resolution fiber tracking. In addition, a 488-subject diffusion magnetic resonance imaging template constructed from the Human Connectome Project data was used to conduct atlas space fiber tracking of CNs. RESULTS The cisternal portions of most CNs were tracked and visualized in each healthy subject and in atlas fiber tracking. The entire optic radiation, medial longitudinal fasciculus, spinal trigeminal nucleus/tract, petroclival portion of the abducens nerve, and intrabrainstem portion of the facial nerve from the root exit zone to the adjacent abducens nucleus were identified. This suggested that the high-angular-resolution fiber tracking was able to distinguish the facial nerve from the vestibulocochlear nerve complex. The tractography clearly visualized CNs displaced by brain tumors. These tractography findings were confirmed intraoperatively. CONCLUSION Using high-angular-resolution fiber tracking and atlas-based fiber tracking, we were able to identify all CNs in unprecedented detail. This implies its potential in localization of CNs during surgical planning. ABBREVIATIONS CN, cranial nerveDSI, diffusion spectrum imagingDTI, diffusion tensor imagingHCP, Human Connectome ProjectHDFT, high-definition fiber tractographyMLF, medial longitudinal fasciculusODF, orientation distribution functionROI, region of interest.
Collapse
Affiliation(s)
- Masanori Yoshino
- *Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania; ‡Department of Psychology, Carnegie Mellon University, Pittsburgh, Pennsylvania; §Department of Psychology, University of Pittsburgh, Pittsburgh, Pennsylvania
| | | | | | | | | | | | | | | |
Collapse
|
92
|
Meola A, Yeh FC, Fellows-Mayle W, Weed J, Fernandez-Miranda JC. Human Connectome-Based Tractographic Atlas of the Brainstem Connections and Surgical Approaches. Neurosurgery 2017; 79:437-55. [PMID: 26914259 DOI: 10.1227/neu.0000000000001224] [Citation(s) in RCA: 65] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND The brainstem is one of the most challenging areas for the neurosurgeon because of the limited space between gray matter nuclei and white matter pathways. Diffusion tensor imaging-based tractography has been used to study the brainstem structure, but the angular and spatial resolution could be improved further with advanced diffusion magnetic resonance imaging (MRI). OBJECTIVE To construct a high-angular/spatial resolution, wide-population-based, comprehensive tractography atlas that presents an anatomical review of the surgical approaches to the brainstem. METHODS We applied advanced diffusion MRI fiber tractography to a population-based atlas constructed with data from a total of 488 subjects from the Human Connectome Project-488. Five formalin-fixed brains were studied for surgical landmarks. Luxol Fast Blue-stained histological sections were used to validate the results of tractography. RESULTS We acquired the tractography of the major brainstem pathways and validated them with histological analysis. The pathways included the cerebellar peduncles, corticospinal tract, corticopontine tracts, medial lemniscus, lateral lemniscus, spinothalamic tract, rubrospinal tract, central tegmental tract, medial longitudinal fasciculus, and dorsal longitudinal fasciculus. Then, the reconstructed 3-dimensional brainstem structure was sectioned at the level of classic surgical approaches, namely supracollicular, infracollicular, lateral mesencephalic, perioculomotor, peritrigeminal, anterolateral (to the medulla), and retro-olivary approaches. CONCLUSION The advanced diffusion MRI fiber tracking is a powerful tool to explore the brainstem neuroanatomy and to achieve a better understanding of surgical approaches. ABBREVIATIONS CN, cranial nerveCPT, corticopontine tractCST, corticospinal tractCTT, central tegmental tractDLF, dorsal longitudinal fasciculusHCP, Human Connectome ProjectML, medial lemniscusMLF, medial longitudinal fasciculusRST, rubrospinal tractSTT, spinothalamic tract.
Collapse
Affiliation(s)
- Antonio Meola
- *Department of Neurosurgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania; ‡Department of Neurosurgery, Brigham and Women's Hospital, Boston, Massachusetts; §Department of Psychology, Carnegie Mellon University, Pittsburgh, Pennsylvania
| | | | | | | | | |
Collapse
|
93
|
Singh S, Daltrozzo J, Conway CM. Effect of pattern awareness on the behavioral and neurophysiological correlates of visual statistical learning. Neurosci Conscious 2017; 2017:nix020. [PMID: 29877520 PMCID: PMC5858025 DOI: 10.1093/nc/nix020] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2016] [Revised: 08/11/2017] [Accepted: 11/14/2017] [Indexed: 11/13/2022] Open
Abstract
Statistical learning is the ability to extract predictive patterns from structured input. A common assumption is that statistical learning is a type of implicit learning that does not result in explicit awareness of learned patterns. However, there is also some evidence that statistical learning may involve explicit processing to some extent. The purpose of this study was to examine the effect of pattern awareness on behavioral and neurophysiological correlates of visual statistical learning. Participants completed a visual learning task while behavioral responses and event-related potentials were recorded. Following the completion of the task, awareness of statistical patterns was assessed through a questionnaire scored by three independent raters. Behavioral findings indicated learning only for participants exhibiting high pattern awareness levels. Neurophysiological data indicated that only the high-pattern awareness group showed expected P300 event-related potential learning effects, although there was also some indication that the low awareness groups showed a sustained mid- to late-latency negativity. Linear mixed-model analyses confirmed that only the high awareness group showed neurophysiological indications of learning. Finally, source estimation results revealed left hemispheric activation was associated with statistical learning extending from frontal to occipital and parietal regions. Further analyses suggested that left insula, left parahippocampal, and right precentral regions showed different levels of activation based on pattern awareness. To conclude, we found that pattern awareness, a dimension associated with explicit processing, strongly influences the behavioral and neurophysiological correlates of visual statistical learning.
Collapse
Affiliation(s)
- Sonia Singh
- Department of Psychology, Georgia State University, Urban Life Building 11th Floor, 140 Decatur Street, Atlanta, GA 30303-3083, USA
| | - Jerome Daltrozzo
- Department of Psychology, Georgia State University, Urban Life Building 11th Floor, 140 Decatur Street, Atlanta, GA 30303-3083, USA
| | - Christopher M Conway
- Department of Psychology, Georgia State University, Urban Life Building 11th Floor, 140 Decatur Street, Atlanta, GA 30303-3083, USA.,Neuroscience Institute, Georgia State University, 880 Petit Science Center, 100 Piedmont Ave. SE, Atlanta, GA 30303, USA
| |
Collapse
|
94
|
Latini F, Mårtensson J, Larsson EM, Fredrikson M, Åhs F, Hjortberg M, Aldskogius H, Ryttlefors M. Segmentation of the inferior longitudinal fasciculus in the human brain: A white matter dissection and diffusion tensor tractography study. Brain Res 2017; 1675:102-115. [PMID: 28899757 DOI: 10.1016/j.brainres.2017.09.005] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Revised: 08/08/2017] [Accepted: 09/01/2017] [Indexed: 10/18/2022]
Abstract
The inferior longitudinal fascicle (ILF) is one of the major occipital-temporal association pathways. Several studies have mapped its hierarchical segmentation to specific functions. There is, however, no consensus regarding a detailed description of ILF fibre organisation. The aim of this study was to establish whether the ILF has a constant number of subcomponents. A secondary aim was to determine the quantitative diffusion proprieties of each subcomponent and assess their anatomical trajectories and connectivity patterns. A white matter dissection of 14 post-mortem normal human hemispheres was conducted to define the course of the ILF and its subcomponents. These anatomical results were then investigated in 24 right-handed, healthy volunteers using in vivo diffusion tensor imaging (DTI) and streamline tractography. Fractional anisotropy (FA), volume, fibre length and the symmetry coefficient of each fibre group were analysed. In order to show the connectivity pattern of the ILF, we also conducted an analysis of the cortical terminations of each segment. We confirmed that the main structure of the ILF is composed of three constant components reflecting the occipital terminations: the fusiform, the lingual and the dorsolateral-occipital. ILF volume was significantly lateralised to the right. The examined indices of ILF subcomponents did not show any significant difference in lateralisation. The connectivity pattern and the quantitative distribution of ILF subcomponents suggest a pivotal role for this bundle in integrating information from highly specialised modular visual areas with activity in anterior temporal territory, which has been previously shown to be important for memory and emotions.
Collapse
Affiliation(s)
- Francesco Latini
- Department of Neuroscience, Neurosurgery, Uppsala University, Uppsala, Sweden.
| | - Johanna Mårtensson
- Department of Surgical Sciences, Radiology, Uppsala University, Uppsala, Sweden
| | - Elna-Marie Larsson
- Department of Surgical Sciences, Radiology, Uppsala University, Uppsala, Sweden
| | - Mats Fredrikson
- Department of Psychology, Uppsala University, Uppsala, Sweden; Department of Clinical Neuroscience, Karolinska Institute, Stockholm, Sweden
| | - Fredrik Åhs
- Department of Psychology, Uppsala University, Uppsala, Sweden; Department of Clinical Neuroscience, Karolinska Institute, Stockholm, Sweden
| | - Mats Hjortberg
- Department of Medical Cell Biology, Education, Uppsala University, Uppsala, Sweden
| | - Håkan Aldskogius
- Department of Neuroscience, Regenerative Neurobiology, Uppsala University, Uppsala, Sweden
| | - Mats Ryttlefors
- Department of Neuroscience, Neurosurgery, Uppsala University, Uppsala, Sweden
| |
Collapse
|
95
|
Maffei C, Jovicich J, De Benedictis A, Corsini F, Barbareschi M, Chioffi F, Sarubbo S. Topography of the human acoustic radiation as revealed by ex vivo fibers micro-dissection and in vivo diffusion-based tractography. Brain Struct Funct 2017; 223:449-459. [PMID: 28866840 DOI: 10.1007/s00429-017-1471-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Accepted: 07/04/2017] [Indexed: 10/18/2022]
Abstract
The acoustic radiation is a compact bundle of fibers conveying auditory information from the medial geniculate nucleus of the thalamus to the auditory cortex. Topographical knowledge of this bundle in primates is scarce and in vivo diffusion-based tractography reconstructions in humans remains challenging, especially with the most widely used MRI acquisition protocols. Therefore, the AR represents a notable anatomical omission in the neurobiological investigation of acoustic and linguistic functional mechanisms in humans. In this study, we combine blunt micro-dissections and advanced diffusion tractography methods to provide novel insights into the topographical anatomy of this bundle in humans. Evidences from ex vivo blunt micro-dissection in three human (two right) hemispheres are compared to the 3D profile of this bundle as reconstructed by tractography techniques in four healthy adult data sets provided by the Human Connectome Project. Both techniques show the unique trajectory of the AR, a transversal course from the midline to the lateral convexity of the posterior temporal lobe. Blunt dissections demonstrated three portions of this bundle that we defined as the genu, stem, and fan, revealing the intimate relationships that each of these components has with neighboring association and projection pathways. Probabilistic tractography and ultra-high b values provided results comparable to blunt micro-dissections and highlighted the main limitations in tracking the AR. This is, to our knowledge, the first ex vivo/in vivo integrated study providing novel and reliable information about the precise anatomy of the AR, which will be important for future investigations in the neuroscientific, clinical, and surgical field.
Collapse
Affiliation(s)
- Chiara Maffei
- CIMeC Center for Mind/Brain Sciences, Trento University, Trento, Italy
| | - Jorge Jovicich
- CIMeC Center for Mind/Brain Sciences, Trento University, Trento, Italy
| | - Alessandro De Benedictis
- Neurosurgery Unit, Department of Neuroscience and Neurorehabilitation, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - Francesco Corsini
- Division of Neurosurgery, Structural and Functional Connectivity Lab (SFC-LSB) Project, Department of Neurosciences, "S. Chiara" Hospital, Trento APSS, 9, Largo Medaglie d'Oro, 38122, Trento, Italy
| | - Mattia Barbareschi
- Department of Histopathology, "S. Chiara" Hospital, Trento APSS, Trento, Italy
| | - Franco Chioffi
- Division of Neurosurgery, Structural and Functional Connectivity Lab (SFC-LSB) Project, Department of Neurosciences, "S. Chiara" Hospital, Trento APSS, 9, Largo Medaglie d'Oro, 38122, Trento, Italy
| | - Silvio Sarubbo
- Division of Neurosurgery, Structural and Functional Connectivity Lab (SFC-LSB) Project, Department of Neurosciences, "S. Chiara" Hospital, Trento APSS, 9, Largo Medaglie d'Oro, 38122, Trento, Italy.
| |
Collapse
|
96
|
Abstract
BACKGROUND Deterministic diffusion tractography obtained from high angular resolution diffusion imaging (HARDI) requires user-defined quantitative anisotropy (QA) thresholds. Most studies employ a common threshold across all subjects even though there is a strong degree of individual variation within groups. We sought to explore whether it would be beneficial to use individual thresholds in order to accommodate individual variance. To do this, we conducted two independent experiments. METHOD First, tractography of the arcuate fasciculus and network connectivity measures were examined in a sample of 14 healthy participants. Second, we assessed the effects of QA threshold on group differences in network connectivity measures between healthy young (n=19) and old (n=14) individuals. RESULTS The results of both experiments were significantly influenced by QA threshold. Common thresholds set too high failed to produce sufficient reconstructions in most subjects, thus decreasing the likelihood of detecting meaningful group differences. On the other hand, common thresholds set too low resulted in spurious reconstructions, providing deleterious results. COMPARISON WITH EXISTING METHODS Subject specific thresholds acquired using our QA threshold selection method (QATS) appeared to provide the most meaningful networks while ensuring that data from all subjects contributed to the analyses. CONCLUSIONS Together, these results support the use of a subject-specific threshold to ensure that data from all subjects are included in the analyses being conducted.
Collapse
|
97
|
Panesar SS, Yeh FC, Deibert CP, Fernandes-Cabral D, Rowthu V, Celtikci P, Celtikci E, Hula WD, Pathak S, Fernández-Miranda JC. A diffusion spectrum imaging-based tractographic study into the anatomical subdivision and cortical connectivity of the ventral external capsule: uncinate and inferior fronto-occipital fascicles. Neuroradiology 2017; 59:971-987. [PMID: 28721443 DOI: 10.1007/s00234-017-1874-3] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Accepted: 06/27/2017] [Indexed: 12/21/2022]
Abstract
PURPOSE The inferior fronto-occipital fasciculus (IFOF) and uncinate fasciculus (UF) are major fronto-capsular white matter pathways. IFOF connects frontal areas of the brain to parieto-occipital areas. UF connects ventral frontal areas to anterior temporal areas. Both fascicles are thought to subserve higher language and emotion roles. Controversy pertaining to their connectivity and subdivision persists in the literature, however. METHODS High-definition fiber tractography (HDFT) is a non-tensor tractographic method using diffusion spectrum imaging data. Its major advantage over tensor-based tractography is its ability to trace crossing fiber pathways. We used HDFT to investigate subdivisions and cortical connectivity of IFOF and UF in 30 single subjects and in an atlas comprising averaged data from 842 individuals. A per-subject aligned, atlas-based approach was employed to seed fiber tracts and to study cortical terminations. RESULTS For IFOF, we observed a tripartite arrangement corresponding to ventrolateral, ventromedial, and dorsomedial frontal origins. IFOF volume was not significantly lateralized to either hemisphere. UF fibers arose from ventromedial and ventrolateral frontal areas on the left and from ventromedial frontal areas on the right. UF volume was significantly lateralized to the left hemisphere. The data from the averaged atlas was largely in concordance with subject-specific findings. IFOF connected to parietal, occipital, but not temporal, areas. UF connected predominantly to temporal poles. CONCLUSION Both IFOF and UF possess subdivided arrangements according to their frontal origin. Our connectivity results indicate the multifunctional involvement of IFOF and UF in language tasks. We discuss our findings in context of the tractographic literature.
Collapse
Affiliation(s)
- Sandip S Panesar
- Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA, USA
| | - Fang-Cheng Yeh
- Department of Psychology, Carnegie Mellon University, Pittsburgh, PA, USA
| | - Christopher P Deibert
- Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA, USA
| | - David Fernandes-Cabral
- Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA, USA
| | - Vijayakrishna Rowthu
- Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA, USA
| | - Pinar Celtikci
- Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA, USA
| | - Emrah Celtikci
- Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA, USA
| | - William D Hula
- Veterans Affairs Pittsburgh Healthcare System, Pittsburgh, PA, USA
| | - Sudhir Pathak
- Learning Research and Development Center, Department of Psychology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Juan C Fernández-Miranda
- Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA, USA.
| |
Collapse
|
98
|
Silva G, Citterio A. Hemispheric asymmetries in dorsal language pathway white-matter tracts: A magnetic resonance imaging tractography and functional magnetic resonance imaging study. Neuroradiol J 2017; 30:470-476. [PMID: 28699372 DOI: 10.1177/1971400917720829] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Introduction Previous studies have shown that the arcuate fasciculus has a leftward asymmetry in right-handers that could be correlated with the language lateralisation defined by functional magnetic resonance imaging. Nonetheless, information about the asymmetry of the other fibres that constitute the dorsal language pathway is scarce. Objectives This study investigated the asymmetry of the white-matter tracts involved in the dorsal language pathway through the diffusion tensor imaging (DTI) technique, in relation to language hemispheric dominance determined by task-dependent functional magnetic resonance imaging (fMRI). Methods We selected 11 patients (10 right-handed) who had been studied with task-dependent fMRI for language areas and DTI and who had no language impairment or structural abnormalities that could compromise magnetic resonance tractography of the fibres involved in the dorsal language pathway. Laterality indices (LI) for fMRI and for the volumes of each tract were calculated. Results In fMRI, all the right-handers had left hemispheric lateralisation, and the ambidextrous subject presented right hemispheric dominance. The arcuate fasciculus LI was strongly correlated with fMRI LI ( r = 0.739, p = 0.009), presenting the same lateralisation of fMRI in seven subjects (including the right hemispheric dominant). It was not asymmetric in three cases and had opposite lateralisation in one case. The other tracts presented predominance for rightward lateralisation, especially superior longitudinal fasciculus (SLF) II/III (nine subjects), but their LI did not correlate (directly or inversely) with fMRI LI. Conclusion The fibres that constitute the dorsal language pathway have an asymmetric distribution in the cerebral hemispheres. Only the asymmetry of the arcuate fasciculus is correlated with fMRI language lateralisation.
Collapse
Affiliation(s)
- Guilherme Silva
- 1 Neuroradiology Department of the São João Hospital Center, Porto, Portugal
| | - Alberto Citterio
- 2 Neuroradiology Department of the Niguarda Hospital Center, Milan, Italy
| |
Collapse
|
99
|
The origins of the vocal brain in humans. Neurosci Biobehav Rev 2017; 77:177-193. [DOI: 10.1016/j.neubiorev.2017.03.014] [Citation(s) in RCA: 76] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Revised: 02/15/2017] [Accepted: 03/22/2017] [Indexed: 01/13/2023]
|
100
|
Jehna M, Becker J, Zaar K, von Campe G, Mahdy Ali K, Reishofer G, Payer F, Synowitz M, Fazekas F, Enzinger C, Deutschmann H. Symmetry of the arcuate fasciculus and its impact on language performance of patients with brain tumors in the language-dominant hemisphere. J Neurosurg 2017; 127:1407-1416. [PMID: 28128689 DOI: 10.3171/2016.9.jns161281] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
OBJECTIVE Cerebral damage in frontal, parietal, and temporal brain areas and, probably more importantly, their interconnections can lead to deficits in language. However, neural plasticity and repair allow the brain to partly compensate for neural injury, mediated by both functional and structural changes. In this study, the authors sought to systematically investigate the relationship between language performance in brain tumor patients and structural perisylvian pathways (i.e., the arcuate fasciculus [AF]) using probabilistic fiber tracking on diffusion tensor imaging. The authors used a previously proposed model in which the AF is divided into anterior, long, and posterior segments. The authors hypothesized that right-handed patients with gliomas in the language-dominant (left) hemisphere would benefit from a more symmetrical or right-lateralized language pathway in terms of better preservation of language abilities. Furthermore, they investigated to what extent specific tumor characteristics, including proximity to the AF, affect language outcome in such patients. METHODS Twenty-seven right-handed patients (12 males and 15 females; mean age 52 ± 16 years) with 11 low-grade and 16 high-grade gliomas of the left hemisphere underwent 3-T diffusion-weighted MRI (30 directions) and language assessment as part of presurgical planning. For a systematic quantitative evaluation of the AF, probabilistic fiber tracking with a 2 regions of interest approach was carried out. Volumes of the 3 segments of both hemispheric AFs were evaluated by quantifying normalized and thresholded pathways. Resulting values served to generate the laterality index of the AFs. RESULTS Patients without language deficits tended to have an AF that was symmetric or lateralized to the right, whereas patients with deficits in language significantly more often demonstrated a left-lateralized posterior segment of the AF. Patients with high-grade gliomas had more severe language deficits than those with low-grade gliomas. Backward logistic regression revealed the laterality index of the posterior AF segment and tumor grade as the only independent statistically significant predictors for language deficits in this cohort. CONCLUSIONS In addition to the well-known fact that tumor entity influences behavioral outcome, the authors' findings suggest that the right homologs of structural language-associated pathways could be supportive for language function and facilitate compensation mechanisms after brain damage in functionally eloquent areas. This further indicates that knowledge about preoperative functional redistribution (identified by neurofunctional imaging) increases the chance for total or near-total resections of tumors in eloquent areas. In the future, longitudinal studies with larger groups are mandatory to overcome the methodological limitations of this cross-sectional study and to map neuroplastic changes associated with language performance and rehabilitation in brain tumor patients.
Collapse
Affiliation(s)
- Margit Jehna
- Division of Neuroradiology, Vascular and Interventional Radiology, Department of Radiology, and
| | - Juliane Becker
- Department of Neurosurgery, University Hospital Center Schleswig Holstein, Kiel, Germany
| | | | | | | | - Gernot Reishofer
- Division of Neuroradiology, Vascular and Interventional Radiology, Department of Radiology, and
| | - Franz Payer
- Division of Neuroradiology, Vascular and Interventional Radiology, Department of Radiology, and.,Neurology, Medical University of Graz, Austria; and
| | - Michael Synowitz
- Department of Neurosurgery, University Hospital Center Schleswig Holstein, Kiel, Germany
| | - Franz Fazekas
- Division of Neuroradiology, Vascular and Interventional Radiology, Department of Radiology, and.,Neurology, Medical University of Graz, Austria; and
| | - Christian Enzinger
- Division of Neuroradiology, Vascular and Interventional Radiology, Department of Radiology, and.,Neurology, Medical University of Graz, Austria; and
| | - Hannes Deutschmann
- Division of Neuroradiology, Vascular and Interventional Radiology, Department of Radiology, and
| |
Collapse
|