1
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Zheng C, Cao Y, Li Y, Ye Z, Jia X, Li M, Yu Y, Liu W. Long-term table tennis training alters dynamic functional connectivity and white matter microstructure in large scale brain regions. Brain Res 2024; 1838:148889. [PMID: 38552934 DOI: 10.1016/j.brainres.2024.148889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2024] [Revised: 03/22/2024] [Accepted: 03/26/2024] [Indexed: 05/12/2024]
Abstract
Table tennis training has been employed as an exercise treatment to enhance cognitive brain functioning in patients with mental illnesses. However, research on its underlying mechanisms remains limited. In this study, we investigated functional and structural changes in large-scale brain regions between 20 table tennis players (TTPs) and 21 healthy controls (HCs) using 7-Tesla magnetic resonance imaging (MRI) techniques. Compared with those of HCs, TTPs exhibited significantly greater fractional anisotropy (FA) and axial diffusivity (AD) values in multiple fiber tracts. We used the locations with the most significant structural changes in white matter as the seed areas and then compared static and dynamic functional connectivity (sFC and dFC). Brodmann 11, located in the orbitofrontal cortex, showed altered dFC values to large-scale brain regions, such as the occipital lobe, thalamus, and cerebellar hemispheres, in TTPs. Brodmann 48, located in the temporal lobe, showed altered dFC to the parietal lobe, frontal lobe, cerebellum, and occipital lobe. Furthermore, the AD values of the forceps minor (Fmi) and right anterior thalamic radiations (ATRs) were negatively correlated with useful field of view (UFOV) test scores in TTPs. Our results suggest that table tennis players exhibit a unique pattern of dynamic neural activity, this provides evidence for potential mechanisms through which table tennis interventions can enhance attention and other cognitive functions.
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Affiliation(s)
- Chanying Zheng
- Interdisciplinary Institute of Neuroscience and Technology, Key Laboratory of Medical Neurobiology of Zhejiang Province, Zhejiang University School of Medicine, Hangzhou, China; Key Laboratory for Biomedical Engineering of Ministry of Education, College of Biomedical Engineering and Instrument Science, Zhejiang University, Hangzhou, China
| | - Yuting Cao
- Key Laboratory for Biomedical Engineering of Ministry of Education, College of Biomedical Engineering and Instrument Science, Zhejiang University, Hangzhou, China
| | - Yuyang Li
- Interdisciplinary Institute of Neuroscience and Technology, Key Laboratory of Medical Neurobiology of Zhejiang Province, Zhejiang University School of Medicine, Hangzhou, China
| | | | - Xize Jia
- School of Psychology, Zhejiang Normal University, Jinhua, China
| | - Mengting Li
- School of Psychology, Zhejiang Normal University, Jinhua, China.
| | - Yang Yu
- Psychiatry Department, the Second Affiliated Hospital Zhejiang University School of Medicine, Zhejiang, Hangzhou, China.
| | - Wenming Liu
- Department of Sport Science, College of Education, Zhejiang University, Hangzhou, China.
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2
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Aziz JR, Good SR, Horne SC, Eskes GA. A scoping review and critique of the Input-Output subtyping dimension of spatial neglect. Cortex 2024; 176:11-36. [PMID: 38729033 DOI: 10.1016/j.cortex.2024.04.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2023] [Revised: 02/28/2024] [Accepted: 04/22/2024] [Indexed: 05/12/2024]
Abstract
Spatial neglect is a common and debilitating disorder after stroke whereby individuals have difficulty reporting, orienting, and/or responding to the contralesional side of space. Given the heterogeneity of neglect symptom presentation, various neglect subtypes have been proposed to better characterize the disorder. This review focuses on the distinction between Input neglect (i.e., difficulty perceiving and/or attending to contralesional stimuli) and Output neglect (i.e., difficulty planning and/or executing movements toward contralesional stimuli). Conceptualizations of Input and Output neglect have varied considerably. We provide a novel summary of the terminology, measurement approaches, and neural correlates of these subtypes. A protocol detailing our systematic scoping review strategy is registered on the Open Science Framework (https://osf.io/bvtxf/). For feasibility and greater comparability across studies, we limited our inclusion criteria to tasks focused on visual stimuli and upper-limb movements. A total of 110 articles were included in the review. Subtyping tasks were categorized based on whether they mainly manipulated aspects of the input (i.e., congruence of visual input with motor output, presence of visual input) or the output (i.e., modality, goal, or direction of output) to produce an Input-Output subtype dissociation. We used our review results to identify four main critiques of this literature: 1) lack of consistency/clarity in conceptual models; 2) methodological issues of dissociating Input and Output subtypes; 3) a need for updated neural theories; and 4) barriers to clinical application. We discuss the lessons learned from this subtyping dimension that can be applied to future research on neglect subtype assessment and treatment.
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Affiliation(s)
- Jasmine R Aziz
- Department of Psychology & Neuroscience, Dalhousie University, Halifax, Canada.
| | - Samantha R Good
- Department of Psychology & Neuroscience, Dalhousie University, Halifax, Canada
| | - Samantha C Horne
- Department of Psychology & Neuroscience, Dalhousie University, Halifax, Canada; Faculty of Medicine, Dalhousie University, Halifax, Canada
| | - Gail A Eskes
- Department of Psychology & Neuroscience, Dalhousie University, Halifax, Canada; Department of Psychiatry, Dalhousie University, Halifax, Canada
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3
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Latifi S, Carmichael ST. The emergence of multiscale connectomics-based approaches in stroke recovery. Trends Neurosci 2024; 47:303-318. [PMID: 38402008 DOI: 10.1016/j.tins.2024.01.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 12/31/2023] [Accepted: 01/21/2024] [Indexed: 02/26/2024]
Abstract
Stroke is a leading cause of adult disability. Understanding stroke damage and recovery requires deciphering changes in complex brain networks across different spatiotemporal scales. While recent developments in brain readout technologies and progress in complex network modeling have revolutionized current understanding of the effects of stroke on brain networks at a macroscale, reorganization of smaller scale brain networks remains incompletely understood. In this review, we use a conceptual framework of graph theory to define brain networks from nano- to macroscales. Highlighting stroke-related brain connectivity studies at multiple scales, we argue that multiscale connectomics-based approaches may provide new routes to better evaluate brain structural and functional remapping after stroke and during recovery.
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Affiliation(s)
- Shahrzad Latifi
- Department of Neurology, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, USA; Department of Neuroscience, Rockefeller Neuroscience Institute, West Virginia University, Morgantown, WV 26506, USA
| | - S Thomas Carmichael
- Department of Neurology, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, USA.
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4
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Zigiotto L, Amorosino G, Saviola F, Jovicich J, Annicchiarico L, Rozzanigo U, Olivetti E, Avesani P, Sarubbo S. Spontaneous unilateral spatial neglect recovery after brain tumour resection: A multimodal diffusion and rs-fMRI case report. J Neuropsychol 2024; 18 Suppl 1:91-114. [PMID: 37431064 DOI: 10.1111/jnp.12339] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Accepted: 05/25/2023] [Indexed: 07/12/2023]
Abstract
Patients with unilateral spatial neglect (USN) are unable to explore or to report stimuli presented in the left personal and extra-personal space. USN is usually caused by lesion of the right parietal lobe: nowadays, it is also clear the key role of structural connections (the second and the third branch of the right Superior Longitudinal Fasciculus, respectively, SLF II and III) and functional networks (Dorsal and Ventral Attention Network, respectively, DAN and VAN) in USN. In this multimodal case report, we have merged those structural and functional information derived from a patient with a right parietal lobe tumour and USN before surgery. Functional, structural and neuropsychological data were also collected 6 months after surgery, when the USN was spontaneously recovered. Diffusion metrics and Functional Connectivity (FC) of the right SLF and DAN, before and after surgery, were compared with the same data of a patient with a tumour in a similar location, but without USN, and with a control sample. Results indicate an impairment in the right SLF III and a reduction of FC of the right DAN in patients with USN before surgery compared to controls; after surgery, when USN was recovered, patient's diffusion metrics and FC showed no differences compared to the controls. This single case and its multimodal approach reinforce the crucial role of the right SLF III and DAN in the development and recovery of egocentric and allocentric extra-personal USN, highlighting the need to preserve these structural and functional areas during brain surgery.
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Affiliation(s)
- Luca Zigiotto
- Department of Neurosurgery, 'S. Chiara' Hospital, Azienda Provinciale per i Servizi Sanitari, Trento, Italy
- Structural and Functional Connectivity Lab Project, 'S. Chiara' Hospital, Azienda Provinciale per i Servizi Sanitari, Trento, Italy
- Department of Psychology, 'S. Chiara' Hospital, Azienda Provinciale per i Servizi Sanitari, Trento, Italy
| | - Gabriele Amorosino
- Neuroinformatics Laboratory (NILab), Bruno Kessler Foundation (FBK), Trento, Italy
- Center for Mind/Brain Sciences-CIMeC, University of Trento, Rovereto, Italy
| | - Francesca Saviola
- Center for Mind/Brain Sciences-CIMeC, University of Trento, Rovereto, Italy
| | - Jorge Jovicich
- Center for Mind/Brain Sciences-CIMeC, University of Trento, Rovereto, Italy
| | - Luciano Annicchiarico
- Department of Neurosurgery, 'S. Chiara' Hospital, Azienda Provinciale per i Servizi Sanitari, Trento, Italy
- Structural and Functional Connectivity Lab Project, 'S. Chiara' Hospital, Azienda Provinciale per i Servizi Sanitari, Trento, Italy
| | - Umberto Rozzanigo
- Department of Neuroradiology, 'S. Chiara' Hospital, Azienda Provinciale per i Servizi Sanitari, Trento, Italy
| | - Emanuele Olivetti
- Neuroinformatics Laboratory (NILab), Bruno Kessler Foundation (FBK), Trento, Italy
- Center for Mind/Brain Sciences-CIMeC, University of Trento, Rovereto, Italy
| | - Paolo Avesani
- Neuroinformatics Laboratory (NILab), Bruno Kessler Foundation (FBK), Trento, Italy
- Center for Mind/Brain Sciences-CIMeC, University of Trento, Rovereto, Italy
| | - Silvio Sarubbo
- Department of Neurosurgery, 'S. Chiara' Hospital, Azienda Provinciale per i Servizi Sanitari, Trento, Italy
- Structural and Functional Connectivity Lab Project, 'S. Chiara' Hospital, Azienda Provinciale per i Servizi Sanitari, Trento, Italy
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5
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Thomasson M, Perez-Marcos D, Crottaz-Herbette S, Brenet F, Saj A, Bernati T, Serino A, Tadi T, Blanke O, Ronchi R. An immersive virtual reality tool for assessing left and right unilateral spatial neglect. J Neuropsychol 2024. [PMID: 38225801 DOI: 10.1111/jnp.12361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2023] [Revised: 12/13/2023] [Accepted: 12/30/2023] [Indexed: 01/17/2024]
Abstract
The reported rate of the occurrence of unilateral spatial neglect (USN) is highly variable likely due to the lack of validity and low sensitivity of classical tools used to assess it. Virtual reality (VR) assessments try to overcome these limitations by proposing immersive and complex environments. Nevertheless, existing VR-based tasks are mostly focused only on near space and lack analysis of psychometric properties and/or clinical validation. The present study evaluates the clinical validity and sensitivity of a new immersive VR-based task to assess USN in the extra-personal space and examines the neuronal correlates of deficits of far space exploration. The task was administrated to two groups of patients with right (N = 28) or left (N = 11) hemispheric brain lesions, also undergoing classical paper-and-pencil assessment, as well as a group of healthy participants. Our VR-based task detected 44% of neglect cases compared to 31% by paper-and-pencil tests in the total sample. Importantly, 30% of the patients (with right or left brain lesions) with no clear sign of USN on the paper-and-pencil tests performed outside the normal range in the VR-based task. Voxel lesion-symptom mapping revealed that deficits detected in VR were associated with lesions in insular and temporal cortex, part of the neural network involved in spatial processing. These results show that our immersive VR-based task is efficient and sensitive in detecting mild to strong manifestations of USN affecting the extra-personal space, which may be undetected using standard tools.
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Affiliation(s)
- Marine Thomasson
- Laboratory for Behavioral Neurology and Imaging of Cognition, University of Geneva, Geneva, Switzerland
- Neuropsychology Unit, Neurology Department, University Hospital of Geneva, Geneva, Switzerland
- Cognitive and Experimental Neuropsychology Laboratory, University of Geneva, Geneva, Switzerland
| | | | - Sonia Crottaz-Herbette
- MindMaze SA, Lausanne, Switzerland
- Neuropsychology and Neurorehabilitation Service, Department of Clinical Neurosciences, Lausanne University Hospital, University of Lausanne, Lausanne, Switzerland
| | | | - Arnaud Saj
- Laboratory for Behavioral Neurology and Imaging of Cognition, University of Geneva, Geneva, Switzerland
- Department of Psychology, University of Montréal, Montréal, Quebec, Canada
- CRIR/Institut Nazareth et Louis-Braille du CISSS de la Montérégie-Centre, Longueuil, Quebec, Canada
- Spectre Biotech, Paris, France
| | - Thérèse Bernati
- Laboratory for Behavioral Neurology and Imaging of Cognition, University of Geneva, Geneva, Switzerland
| | - Andrea Serino
- MindMaze SA, Lausanne, Switzerland
- MySpace Lab, Department of Clinical Neurosciences, Lausanne, University of Lausanne, Lausanne, Switzerland
- Laboratory of Cognitive Neuroscience, Neuro-X Institute and Brain-Mind Institute, Ecole Polytechnique Fédérale de Lausanne (EPFL), Geneva, Switzerland
| | - Tej Tadi
- MindMaze SA, Lausanne, Switzerland
| | - Olaf Blanke
- Laboratory of Cognitive Neuroscience, Neuro-X Institute and Brain-Mind Institute, Ecole Polytechnique Fédérale de Lausanne (EPFL), Geneva, Switzerland
- Department of Neurosurgery, Lausanne University Hospital, University of Lausanne, Lausanne, Switzerland
| | - Roberta Ronchi
- Laboratory for Behavioral Neurology and Imaging of Cognition, University of Geneva, Geneva, Switzerland
- Neuropsychology Unit, Neurology Department, University Hospital of Geneva, Geneva, Switzerland
- Laboratory of Cognitive Neuroscience, Neuro-X Institute and Brain-Mind Institute, Ecole Polytechnique Fédérale de Lausanne (EPFL), Geneva, Switzerland
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6
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Martin J, Vuilleumier P, Assal F, Ronchi R. Neglecting the bottom space: an object-based disorder? A two-case observational study. Neurocase 2023; 29:121-131. [PMID: 38406985 DOI: 10.1080/13554794.2024.2315860] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Accepted: 01/22/2024] [Indexed: 02/27/2024]
Abstract
Altitudinal neglect is an atypical form of spatial neglect where brain-damaged patients neglect the lower, or sometimes the upper, part of the space. Our understanding of this phenomena is limited, with unknown occurrence across different reference frames, such as distance (peripersonal vs. extrapersonal) and system of reference (egocentric vs. allocentric). Two patients with acute bilateral (P1) or right hemispheric (P2) stroke, with signs of bottom altitudinal neglect, underwent an extensive evaluation of neglect within 10 days post-stroke. Assessments involved altitudinal neglect and unilateral spatial neglect (USN) in peripersonal space, exploring egocentric and allocentric signs and in extrapersonal space. Compared to a control group of 15 healthy age-matched subjects, patients showed allocentric and egocentric left USN in peripersonal space, and mostly allocentric signs of altitudinal neglect. No signs of neglect were evidenced in extrapersonal space. Altitudinal neglect could thus present as an allocentric form of spatial neglect, suggesting that allocentric representations may not only affect the deployment of attentional resources along horizontal dimensions but also operate along vertical dimensions. Future studies should deepen our understanding of altitudinal neglect, eventually leading to further unravel spatial processes that control attention, their corresponding brain mechanisms, and implications for patients' rehabilitation and functional outcome.
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Affiliation(s)
- Jennifer Martin
- Department of Clinical Neurosciences, University Hospitals of Geneva, Geneva, Switzerland
| | - Patrik Vuilleumier
- Laboratory of Behavioral Neurology and Imaging of Cognition, Department of Neuroscience, University Hospitals of Geneva, University of Geneva, Geneva, Switzerland
- Faculty of Medecine, University of Geneva, Geneva, Switzerland
| | - Frédéric Assal
- Department of Clinical Neurosciences, University Hospitals of Geneva, Geneva, Switzerland
- Faculty of Medecine, University of Geneva, Geneva, Switzerland
| | - Roberta Ronchi
- Department of Clinical Neurosciences, University Hospitals of Geneva, Geneva, Switzerland
- Laboratory of Behavioral Neurology and Imaging of Cognition, Department of Neuroscience, University Hospitals of Geneva, University of Geneva, Geneva, Switzerland
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7
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Yan S, Zhang Y, Yin X, Chen J, Zhu Z, Jin H, Li H, Yin J, Jiang Y. Alterations in white matter integrity and network topological properties are associated with a decrease in global motion perception in older adults. Front Aging Neurosci 2023; 15:1045263. [PMID: 36967826 PMCID: PMC10034108 DOI: 10.3389/fnagi.2023.1045263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Accepted: 02/20/2023] [Indexed: 03/11/2023] Open
Abstract
Previous studies have mainly explored the effects of structural and functional aging of cortical regions on global motion sensitivity in older adults, but none have explored the structural white matter (WM) substrates underlying the age-related decrease in global motion perception (GMP). In this study, random dot kinematogram and diffusion tensor imaging were used to investigate the effects of age-related reductions in WM fiber integrity and connectivity across various regions on GMP. We recruited 106 younger adults and 94 older adults and utilized both tract-based spatial statistics analysis and graph theoretical analysis to comprehensively investigate group differences in WM microstructural and network connections between older and younger adults at the microscopic and macroscopic levels. Moreover, partial correlation analysis was used to explore the relationship between alterations in WM and the age-related decrease in GMP. The results showed that decreased GMP in older adults was related to decreased fractional anisotropy (FA) of the inferior frontal-occipital fasciculus, inferior longitudinal fasciculus, anterior thalamic radiation, superior longitudinal fasciculus, and cingulum cingulate gyrus. Decreased global efficiency of the WM structural network and increased characteristic path length were closely associated with decreased global motion sensitivity. These results suggest that the reduced GMP in older adults may stem from reduced WM integrity in specific regions of WM fiber tracts as well as decreased efficiency of information integration and communication between distant cortical regions, supporting the “disconnection hypothesis” of cognitive aging.
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Affiliation(s)
- Shizhen Yan
- Faculty of Psychology, Tianjin Normal University, Tianjin, China
| | - Yuping Zhang
- Medicine School of Rehabilitation, Henan University of Chinese Medicine, Zhengzhou, China
| | - Xiaojuan Yin
- Faculty of Psychology, Tianjin Normal University, Tianjin, China
| | - Juntao Chen
- Faculty of Psychology, Tianjin Normal University, Tianjin, China
| | - Ziliang Zhu
- State Key Laboratory for Cognitive Neuroscience and Learning, Beijing Normal University, Beijing, China
| | - Hua Jin
- Faculty of Psychology, Tianjin Normal University, Tianjin, China
- Key Research Base of Humanities and Social Sciences of the Ministry of Education, Academy of Psychology and Behavior, Tianjin Normal University, Tianjin, China
- *Correspondence: Hua Jin,
| | - Han Li
- The First Central Clinical College of Tianjin Medical University, Tianjin, China
| | - Jianzhong Yin
- Department of Radiology, People’s Hospital of Haikou, Haikou, China
| | - Yunpeng Jiang
- Faculty of Psychology, Tianjin Normal University, Tianjin, China
- Key Research Base of Humanities and Social Sciences of the Ministry of Education, Academy of Psychology and Behavior, Tianjin Normal University, Tianjin, China
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8
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Lafitte R, Jeager M, Piscicelli C, Dai S, Lemaire C, Chrispin A, Davoine P, Dupierrix E, Pérennou D. Spatial neglect encompasses impaired verticality representation after right hemisphere stroke. Ann N Y Acad Sci 2023; 1520:140-152. [PMID: 36478572 DOI: 10.1111/nyas.14938] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Spatial neglect after right hemisphere stroke (RHS) was recently found to encompass lateropulsion, a deficit in body orientation with respect to gravity caused by altered brain processing of graviception. By analogy, we hypothesized that spatial neglect after RHS might encompass an altered representation of verticality. We also assumed a strong relation between body neglect and impaired postural vertical, both referring to the body. To tackle these issues, we performed contingency and correlation analyses between two domains of spatial neglect (body, extra-body) and two modalities of verticality perception (postural, visual) in 77 individuals (median age = 67) with a first-ever subacute RHS (1-3 months). All individuals with a transmodal (postural and visual) tilt in verticality perception (n = 26) had spatial neglect, but the reverse was not found. Correlation and multivariate analyses revealed that spatial neglect (and notably body neglect) was associated more with postural than visual vertical tilts. These findings indicate that after RHS, an impaired verticality representation results from a kind of graviceptive neglect, bearing first on somaesthetic graviception and second on vestibular graviception. They also suggest that the human brain uses not only a mosaic of 2D representations but also 3D maps involving a transmodal representation of verticality.
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Affiliation(s)
- Rémi Lafitte
- Department of Neurorehabilitation, Univ. Grenoble Alpes, UMR CNRS 5105 Neuropsychology and Neurocognition, CHU Grenoble Alpes, South Hospital, Grenoble, France
| | - Marie Jeager
- Department of Neurorehabilitation, Univ. Grenoble Alpes, UMR CNRS 5105 Neuropsychology and Neurocognition, CHU Grenoble Alpes, South Hospital, Grenoble, France
| | - Céline Piscicelli
- Department of Neurorehabilitation, Univ. Grenoble Alpes, UMR CNRS 5105 Neuropsychology and Neurocognition, CHU Grenoble Alpes, South Hospital, Grenoble, France
| | - Shenhao Dai
- Department of Neurorehabilitation, Univ. Grenoble Alpes, UMR CNRS 5105 Neuropsychology and Neurocognition, CHU Grenoble Alpes, South Hospital, Grenoble, France
| | - Camille Lemaire
- Department of Neurorehabilitation, Univ. Grenoble Alpes, UMR CNRS 5105 Neuropsychology and Neurocognition, CHU Grenoble Alpes, South Hospital, Grenoble, France
| | - Anne Chrispin
- Department of Neurorehabilitation, Univ. Grenoble Alpes, UMR CNRS 5105 Neuropsychology and Neurocognition, CHU Grenoble Alpes, South Hospital, Grenoble, France
| | - Patrice Davoine
- Department of Neurorehabilitation, Univ. Grenoble Alpes, UMR CNRS 5105 Neuropsychology and Neurocognition, CHU Grenoble Alpes, South Hospital, Grenoble, France
| | - Eve Dupierrix
- Department of Neurorehabilitation, Univ. Grenoble Alpes, UMR CNRS 5105 Neuropsychology and Neurocognition, CHU Grenoble Alpes, South Hospital, Grenoble, France
| | - Dominic Pérennou
- Department of Neurorehabilitation, Univ. Grenoble Alpes, UMR CNRS 5105 Neuropsychology and Neurocognition, CHU Grenoble Alpes, South Hospital, Grenoble, France
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9
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Wiesen D, Bonilha L, Rorden C, Karnath HO. Disconnectomics to unravel the network underlying deficits of spatial exploration and attention. Sci Rep 2022; 12:22315. [PMID: 36566307 PMCID: PMC9789971 DOI: 10.1038/s41598-022-26491-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Accepted: 12/15/2022] [Indexed: 12/25/2022] Open
Abstract
Spatial attention and exploration are related to a predominantly right hemispheric network structure. However, the areas of the brain involved and their exact role is still debated. Spatial neglect following right hemispheric stroke lesions has been frequently viewed as a model to study these processes in humans. Previous investigations on the anatomical basis on spatial neglect predominantly focused on focal brain damage and lesion-behaviour mapping analyses. This approach might not be suited to detect remote areas structurally spared but which might contribute to the behavioural deficit. In the present study of a sample of 203 right hemispheric stroke patients, we combined connectome lesion-symptom mapping with multivariate support vector regression to unravel the complex and disconnected network structure in spatial neglect. We delineated three central nodes that were extensively disconnected from other intrahemispheric areas, namely the right superior parietal lobule, the insula, and the temporal pole. Additionally, the analysis allocated central roles within this network to the inferior frontal gyrus (pars triangularis and opercularis), right middle temporal gyrus, right temporal pole and left and right orbitofrontal cortices, including interhemispheric disconnection. Our results suggest that these structures-although not necessarily directly damaged-might play a role within the network underlying spatial neglect in humans.
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Affiliation(s)
- Daniel Wiesen
- Centre of Neurology, Division of Neuropsychology, Hertie-Institute for Clinical Brain Research, University of Tübingen, 72076, Tübingen, Germany.
| | | | | | - Hans-Otto Karnath
- Centre of Neurology, Division of Neuropsychology, Hertie-Institute for Clinical Brain Research, University of Tübingen, 72076, Tübingen, Germany
- Department of Psychology, University of South Carolina, Columbia, USA
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10
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Röhrig L, Sperber C, Bonilha L, Rorden C, Karnath HO. Right hemispheric white matter hyperintensities improve the prediction of spatial neglect severity in acute stroke. Neuroimage Clin 2022; 36:103265. [PMID: 36451368 PMCID: PMC9723300 DOI: 10.1016/j.nicl.2022.103265] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 10/12/2022] [Accepted: 11/08/2022] [Indexed: 11/13/2022]
Abstract
White matter hyperintensities (WMH) are frequently observed in brain scans of elderly people. They are associated with an increased risk of stroke, cognitive decline, and dementia. However, it is unknown yet if measures of WMH provide information that improve the understanding of poststroke outcome compared to only state-of-the-art stereotaxic structural lesion data. We implemented high-dimensional machine learning models, based on support vector regression, to predict the severity of spatial neglect in 103 acute right hemispheric stroke patients. We found that (1) the additional information of right hemispheric or bilateral voxel-based topographic WMH extent indeed yielded a significant improvement in predicting acute neglect severity (compared to the voxel-based stroke lesion map alone). (2) Periventricular WMH appeared more relevant for prediction than deep subcortical WMH. (3) Among different measures of WMH, voxel-based maps as measures of topographic extent allowed more accurate predictions compared to the use of traditional ordinally assessed visual rating scales (Fazekas-scale, Cardiovascular Health Study-scale). In summary, topographic WMH appear to be a valuable clinical imaging biomarker for predicting the severity of cognitive deficits and bears great potential for rehabilitation guidance of acute stroke patients.
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Affiliation(s)
- Lisa Röhrig
- Division of Neuropsychology, Center of Neurology, Hertie-Institute for Clinical Brain Research, University of Tübingen, Tübingen 72076, Germany
| | - Christoph Sperber
- Division of Neuropsychology, Center of Neurology, Hertie-Institute for Clinical Brain Research, University of Tübingen, Tübingen 72076, Germany
| | - Leonardo Bonilha
- Department of Neurology, Emory University, Atlanta, GA 30322, USA
| | - Christopher Rorden
- Department of Psychology, University of South Carolina, Columbia, SC 29208, USA
| | - Hans-Otto Karnath
- Division of Neuropsychology, Center of Neurology, Hertie-Institute for Clinical Brain Research, University of Tübingen, Tübingen 72076, Germany; Department of Psychology, University of South Carolina, Columbia, SC 29208, USA.
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11
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Song S, Hasan MN, Yu L, Paruchuri SS, Bielanin JP, Metwally S, Oft HCM, Fischer SG, Fiesler VM, Sen T, Gupta RK, Foley LM, Hitchens TK, Dixon CE, Cambi F, Sen N, Sun D. Microglial-oligodendrocyte interactions in myelination and neurological function recovery after traumatic brain injury. J Neuroinflammation 2022; 19:246. [PMID: 36199097 PMCID: PMC9533529 DOI: 10.1186/s12974-022-02608-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Accepted: 09/23/2022] [Indexed: 11/10/2022] Open
Abstract
Differential microglial inflammatory responses play a role in regulation of differentiation and maturation of oligodendrocytes (OLs) in brain white matter. How microglia-OL crosstalk is altered by traumatic brain injury (TBI) and its impact on axonal myelination and neurological function impairment remain poorly understood. In this study, we investigated roles of a Na+/H+ exchanger (NHE1), an essential microglial pH regulatory protein, in microglial proinflammatory activation and OL survival and differentiation in a murine TBI model induced by controlled cortical impact. Similar TBI-induced contusion volumes were detected in the Cx3cr1-CreERT2 control (Ctrl) mice and selective microglial Nhe1 knockout (Cx3cr1-CreERT2;Nhe1flox/flox, Nhe1 cKO) mice. Compared to the Ctrl mice, the Nhe1 cKO mice displayed increased resistance to initial TBI-induced white matter damage and accelerated chronic phase of OL regeneration at 30 days post-TBI. The cKO brains presented increased anti-inflammatory phenotypes of microglia and infiltrated myeloid cells, with reduced proinflammatory transcriptome profiles. Moreover, the cKO mice exhibited accelerated post-TBI sensorimotor and cognitive functional recovery than the Ctrl mice. These phenotypic outcomes in cKO mice were recapitulated in C57BL6J wild-type TBI mice receiving treatment of a potent NHE1 inhibitor HOE642 for 1-7 days post-TBI. Taken together, these findings collectively demonstrated that blocking NHE1 protein stimulates restorative microglial activation in oligodendrogenesis and neuroprotection, which contributes to accelerated brain repair and neurological function recovery after TBI.
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Affiliation(s)
- Shanshan Song
- Department of Neurology, University of Pittsburgh, 3501 Fifth Avenue, Pittsburgh, PA, 15213, USA.,Pittsburgh Institute for Neurodegenerative Disorders, University of Pittsburgh, Pittsburgh, PA, 15213, USA.,Veterans Affairs Pittsburgh Health Care System, Pittsburgh, PA, 15213, USA
| | - Md Nabiul Hasan
- Department of Neurology, University of Pittsburgh, 3501 Fifth Avenue, Pittsburgh, PA, 15213, USA.,Pittsburgh Institute for Neurodegenerative Disorders, University of Pittsburgh, Pittsburgh, PA, 15213, USA.,Veterans Affairs Pittsburgh Health Care System, Pittsburgh, PA, 15213, USA
| | - Lauren Yu
- Department of Neurology, University of Pittsburgh, 3501 Fifth Avenue, Pittsburgh, PA, 15213, USA.,Pittsburgh Institute for Neurodegenerative Disorders, University of Pittsburgh, Pittsburgh, PA, 15213, USA
| | - Satya S Paruchuri
- Department of Neurology, University of Pittsburgh, 3501 Fifth Avenue, Pittsburgh, PA, 15213, USA.,Pittsburgh Institute for Neurodegenerative Disorders, University of Pittsburgh, Pittsburgh, PA, 15213, USA
| | - John P Bielanin
- Department of Neurology, University of Pittsburgh, 3501 Fifth Avenue, Pittsburgh, PA, 15213, USA.,Pittsburgh Institute for Neurodegenerative Disorders, University of Pittsburgh, Pittsburgh, PA, 15213, USA
| | - Shamseldin Metwally
- Department of Neurology, University of Pittsburgh, 3501 Fifth Avenue, Pittsburgh, PA, 15213, USA.,Pittsburgh Institute for Neurodegenerative Disorders, University of Pittsburgh, Pittsburgh, PA, 15213, USA
| | - Helena C M Oft
- Department of Neurology, University of Pittsburgh, 3501 Fifth Avenue, Pittsburgh, PA, 15213, USA.,Pittsburgh Institute for Neurodegenerative Disorders, University of Pittsburgh, Pittsburgh, PA, 15213, USA
| | - Sydney G Fischer
- Department of Neurology, University of Pittsburgh, 3501 Fifth Avenue, Pittsburgh, PA, 15213, USA.,Pittsburgh Institute for Neurodegenerative Disorders, University of Pittsburgh, Pittsburgh, PA, 15213, USA
| | - Victoria M Fiesler
- Department of Neurology, University of Pittsburgh, 3501 Fifth Avenue, Pittsburgh, PA, 15213, USA.,Pittsburgh Institute for Neurodegenerative Disorders, University of Pittsburgh, Pittsburgh, PA, 15213, USA.,Veterans Affairs Pittsburgh Health Care System, Pittsburgh, PA, 15213, USA
| | - Tanusree Sen
- Department of Neurological Surgery, University of Pittsburgh, Pittsburgh, PA, 15213, USA
| | - Rajaneesh K Gupta
- Department of Neurological Surgery, University of Pittsburgh, Pittsburgh, PA, 15213, USA
| | - Lesley M Foley
- Animal Imaging Center, University of Pittsburgh, Pittsburgh, PA, 15213, USA
| | - T Kevin Hitchens
- Animal Imaging Center, University of Pittsburgh, Pittsburgh, PA, 15213, USA.,Department of Neurobiology, University of Pittsburgh, Pittsburgh, PA, 15213, USA
| | - C Edward Dixon
- Veterans Affairs Pittsburgh Health Care System, Pittsburgh, PA, 15213, USA.,Department of Neurological Surgery, University of Pittsburgh, Pittsburgh, PA, 15213, USA
| | - Franca Cambi
- Department of Neurology, University of Pittsburgh, 3501 Fifth Avenue, Pittsburgh, PA, 15213, USA.,Pittsburgh Institute for Neurodegenerative Disorders, University of Pittsburgh, Pittsburgh, PA, 15213, USA.,Veterans Affairs Pittsburgh Health Care System, Pittsburgh, PA, 15213, USA
| | - Nilkantha Sen
- Department of Neurological Surgery, University of Pittsburgh, Pittsburgh, PA, 15213, USA
| | - Dandan Sun
- Department of Neurology, University of Pittsburgh, 3501 Fifth Avenue, Pittsburgh, PA, 15213, USA. .,Pittsburgh Institute for Neurodegenerative Disorders, University of Pittsburgh, Pittsburgh, PA, 15213, USA. .,Veterans Affairs Pittsburgh Health Care System, Pittsburgh, PA, 15213, USA.
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12
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Lv Q, Zhang J, Pan Y, Liu X, Miao L, Peng J, Song L, Zou Y, Chen X. Somatosensory Deficits After Stroke: Insights From MRI Studies. Front Neurol 2022; 13:891283. [PMID: 35911919 PMCID: PMC9328992 DOI: 10.3389/fneur.2022.891283] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Accepted: 06/15/2022] [Indexed: 11/28/2022] Open
Abstract
Somatosensory deficits after stroke are a major health problem, which can impair patients' health status and quality of life. With the developments in human brain mapping techniques, particularly magnetic resonance imaging (MRI), many studies have applied those techniques to unravel neural substrates linked to apoplexy sequelae. Multi-parametric MRI is a vital method for the measurement of stroke and has been applied to diagnose stroke severity, predict outcome and visualize changes in activation patterns during stroke recovery. However, relatively little is known about the somatosensory deficits after stroke and their recovery. This review aims to highlight the utility and importance of MRI techniques in the field of somatosensory deficits and synthesizes corresponding articles to elucidate the mechanisms underlying the occurrence and recovery of somatosensory symptoms. Here, we start by reviewing the anatomic and functional features of the somatosensory system. And then, we provide a discussion of MRI techniques and analysis methods. Meanwhile, we present the application of those techniques and methods in clinical studies, focusing on recent research advances and the potential for clinical translation. Finally, we identify some limitations and open questions of current imaging studies that need to be addressed in future research.
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Affiliation(s)
- Qiuyi Lv
- Department of Neurology and Stroke Center, Dongzhimen Hospital, The First Affiliated Hospital of Beijing University of Chinese Medicine, Beijing, China
| | - Junning Zhang
- Department of Integrative Oncology, China-Japan Friendship Hospital, Beijing, China
| | - Yuxing Pan
- Institute of Neuroscience, Chinese Academy of Science, Shanghai, China
| | - Xiaodong Liu
- School of Acupuncture-Moxibustion and Tuina, Beijing University of Chinese Medicine, Beijing, China
| | | | - Jing Peng
- Department of Neurology and Stroke Center, Dongzhimen Hospital, The First Affiliated Hospital of Beijing University of Chinese Medicine, Beijing, China
| | - Lei Song
- Department of Neurology and Stroke Center, Dongzhimen Hospital, The First Affiliated Hospital of Beijing University of Chinese Medicine, Beijing, China
| | - Yihuai Zou
- Department of Neurology and Stroke Center, Dongzhimen Hospital, The First Affiliated Hospital of Beijing University of Chinese Medicine, Beijing, China
| | - Xing Chen
- Department of Neurology and Stroke Center, Dongzhimen Hospital, The First Affiliated Hospital of Beijing University of Chinese Medicine, Beijing, China
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13
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Xu X, Jin Y, Pan N, Cao M, Jing J, Ma J, Fan X, Tan S, Song X, Li X. A Diffusion Tensor Imaging Study on the White Matter Structures Related to the Phonology in Cantonese-Mandarin Bilinguals. Front Hum Neurosci 2022; 16:851669. [PMID: 35601910 PMCID: PMC9120590 DOI: 10.3389/fnhum.2022.851669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Accepted: 03/24/2022] [Indexed: 11/13/2022] Open
Abstract
Cantonese and Mandarin are logographic languages, and the phonology is the main difference between the two languages. It is unclear whether the long-term experience of Cantonese-Mandarin bilingualism will shape different brain white matter structures related to phonological processing. A total of 30 Cantonese-Mandarin bilinguals and 30 Mandarin monolinguals completed diffusion-weighted imaging scan and phonological processing tasks. The tractography and tract-based spatial statistics were used to investigate the structural differences in the bilateral superior longitudinal fasciculus (SLF), inferior longitudinal fasciculus (ILF), and inferior fronto-occipital fasciculus (IFOF) between Cantonese-Mandarin bilinguals and Mandarin monolinguals. The post-hoc correlation analysis was conducted to investigate the relationship between the different structures with phonological processing skills. Compared to the Mandarin monolinguals, the Cantonese-Mandarin bilinguals had higher fractional anisotropy (FA) along the left ILFs higher mean diffusivity (MD) along the right IFOF and the temporoparietal segment of SLF (tSLF), higher axial diffusivity (AD) in the right IFOF and left ILF, and lower number of streamlines in the bilateral tSLF. The mean AD of the different voxels in the right IFOF and the mean FA of the different voxels in the left ILF were positively correlated with the inverse efficiency score (IES) of the Cantonese auditory and Mandarin visual rhyming judgment tasks, respectively, within the bilingual group. The correlation between FA and IES was different among the groups. The long-term experience of Cantonese-Mandarin bilinguals shapes the different brain white matter structures in tSLF, IFOF, and ILF. Compared to the monolinguals, the bilinguals' white matter showed higher diffusivity, especially in the axonal direction. These changes were related to bilinguals' phonological processing.
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Affiliation(s)
- Xiaoyu Xu
- Department of Maternal and Child Health, School of Public Health, Sun Yat-sen University, Guangzhou, China
| | - Yuying Jin
- Department of Maternal and Child Health, School of Public Health, Sun Yat-sen University, Guangzhou, China
| | - Ning Pan
- Department of Maternal and Child Health, School of Public Health, Sun Yat-sen University, Guangzhou, China
| | - Muqing Cao
- Department of Maternal and Child Health, School of Public Health, Sun Yat-sen University, Guangzhou, China
| | - Jin Jing
- Department of Maternal and Child Health, School of Public Health, Sun Yat-sen University, Guangzhou, China
| | - Jingwen Ma
- Guangdong Provincial Maternal and Child Health Care Hospital, Guangzhou, China
| | - Xiaoxuan Fan
- Wuhan Children’s Hospital, Tongji Medical College, Huazhong University of Science & Technology, Wuhan, China
| | - Si Tan
- Department of Maternal and Child Health, School of Public Health, Sun Yat-sen University, Guangzhou, China
| | - Xiaojing Song
- Department of Maternal and Child Health, School of Public Health, Sun Yat-sen University, Guangzhou, China
| | - Xiuhong Li
- Department of Maternal and Child Health, School of Public Health, Sun Yat-sen University, Guangzhou, China
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14
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Lazarou I, Georgiadis K, Nikolopoulos S, Oikonomou VP, Stavropoulos TG, Tsolaki A, Kompatsiaris I, Tsolaki M. Exploring Network Properties Across Preclinical Stages of Alzheimer’s Disease Using a Visual Short-Term Memory and Attention Task with High-Density Electroencephalography: A Brain-Connectome Neurophysiological Study. J Alzheimers Dis 2022; 87:643-664. [DOI: 10.3233/jad-215421] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Background: Visual short-term memory (VSTMT) and visual attention (VAT) exhibit decline in the Alzheimer’s disease (AD) continuum; however, network disruption in preclinical stages is scarcely explored. Objective: To advance our knowledge about brain networks in AD and discover connectivity alterations during VSTMT and VAT. Methods: Twelve participants with AD, 23 with mild cognitive impairment (MCI), 17 with subjective cognitive decline (SCD), and 21 healthy controls (HC) were examined using a neuropsychological battery at baseline and follow-up (three years). At baseline, the subjects were examined using high density electroencephalography while performing a VSTMT and VAT. For exploring network organization, we constructed weighted undirected networks and examined clustering coefficient, strength, and betweenness centrality from occipito-parietal regions. Results: One-way ANOVA and pair-wise t-test comparisons showed statistically significant differences in HC compared to SCD (t (36) = 2.43, p = 0.026), MCI (t (42) = 2.34, p = 0.024), and AD group (t (31) = 3.58, p = 0.001) in Clustering Coefficient. Also with regards to Strength, higher values for HC compared to SCD (t (36) = 2.45, p = 0.019), MCI (t (42) = 2.41, p = 0.020), and AD group (t (31) = 3.58, p = 0.001) were found. Follow-up neuropsychological assessment revealed converge of 65% of the SCD group to MCI. Moreover, SCD who were converted to MCI showed significant lower values in all network metrics compared to the SCD that remained stable. Conclusion: The present findings reveal that SCD exhibits network disorganization during visual encoding and retrieval with intermediate values between MCI and HC.
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Affiliation(s)
- Ioulietta Lazarou
- Information Technologies Institute, Centre for Research and Technology Hellas (CERTH-ITI), Thessaloniki, Makedonia, Greece
- 1 Department of Neurology, G.H. “AHEPA”, School of Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, Makedonia, Greece
| | - Kostas Georgiadis
- Information Technologies Institute, Centre for Research and Technology Hellas (CERTH-ITI), Thessaloniki, Makedonia, Greece
- Informatics Department, Aristotle University of Thessaloniki, Makedonia, Greece
| | - Spiros Nikolopoulos
- Information Technologies Institute, Centre for Research and Technology Hellas (CERTH-ITI), Thessaloniki, Makedonia, Greece
| | - Vangelis P. Oikonomou
- Information Technologies Institute, Centre for Research and Technology Hellas (CERTH-ITI), Thessaloniki, Makedonia, Greece
| | - Thanos G. Stavropoulos
- Information Technologies Institute, Centre for Research and Technology Hellas (CERTH-ITI), Thessaloniki, Makedonia, Greece
| | - Anthoula Tsolaki
- Information Technologies Institute, Centre for Research and Technology Hellas (CERTH-ITI), Thessaloniki, Makedonia, Greece
- Greek Association of Alzheimer’s Disease and Related Disorders, Thessaloniki, Makedonia, Greece
| | - Ioannis Kompatsiaris
- Information Technologies Institute, Centre for Research and Technology Hellas (CERTH-ITI), Thessaloniki, Makedonia, Greece
| | - Magda Tsolaki
- Information Technologies Institute, Centre for Research and Technology Hellas (CERTH-ITI), Thessaloniki, Makedonia, Greece
- 1 Department of Neurology, G.H. “AHEPA”, School of Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, Makedonia, Greece
- Greek Association of Alzheimer’s Disease and Related Disorders, Thessaloniki, Makedonia, Greece
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15
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Kwon BM, Lee JY, Ko N, Kim BR, Moon WJ, Choi DH, Lee J. Correlation of Hemispatial Neglect with White Matter Tract Integrity: A DTI Study. BRAIN & NEUROREHABILITATION 2022; 15:e6. [PMID: 36743846 PMCID: PMC9833463 DOI: 10.12786/bn.2022.15.e6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Revised: 03/14/2022] [Accepted: 03/22/2022] [Indexed: 11/08/2022] Open
Abstract
We investigated the diffusion tensor image (DTI) parameters of superior longitudinal fasciculus (SLF) and inferior fronto-occipital fasciculus (IFOF), and their relationships with hemispatial neglect. Thirteen patients with first-ever ischemic stroke who had the right hemispheric lesion were included. Neglect was assessed using the Albert test and figure discrimination test of Motor-free Visual Perception Test 3 (MVPT-3). The SLF and IFOF were separated by diffusion tensor tractography (DTT) and tract volume (TV) was calculated. We measured the fractional anisotropy (FA) and apparent diffusion coefficient (ADC) values in the total area, seed region of interest (ROI), and target ROI, respectively. Among thirteen patients, seven demonstrated signs of hemispatial neglect on neglect test. Tractography reconstruction showed significantly low TV of the right IFOF in patients with hemispatial neglect. FA values of the right SLF and the right IFOF were significantly lower in neglect patients. ADC values were not significantly different in two groups. This study suggests that damage of SLF and IFOF is associated with hemispatial neglect in right hemispheric stroke patients. DTI may be useful for predicting the severities of hemispatial neglect using values such as TV and FA of each tract.
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Affiliation(s)
- Bo Mi Kwon
- Department of Rehabilitation Medicine, Konkuk University School of Medicine and Konkuk University Medical Center, Seoul, Korea
| | - Jin-Youn Lee
- Department of Rehabilitation Medicine, Konkuk University School of Medicine and Konkuk University Medical Center, Seoul, Korea
| | - Nayeon Ko
- Department of Rehabilitation Medicine, Konkuk University School of Medicine and Konkuk University Medical Center, Seoul, Korea
| | - Bo-Ram Kim
- Department of Rehabilitation Medicine, Gyeongin Rehabilitation Center Hospital, Incheon, Korea
| | - Won-Jin Moon
- Department of Radiology, Konkuk University School of Medicine and Konkuk University Medical Center, Seoul, Korea
| | - Dong-Hee Choi
- Department of Medical Science, Konkuk University School of Medicine, Seoul, Korea
| | - Jongmin Lee
- Department of Rehabilitation Medicine, Konkuk University School of Medicine and Konkuk University Medical Center, Seoul, Korea
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16
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Ros T, Michela A, Mayer A, Bellmann A, Vuadens P, Zermatten V, Saj A, Vuilleumier P. Disruption of large-scale electrophysiological networks in stroke patients with visuospatial neglect. Netw Neurosci 2022; 6:69-89. [PMID: 35356193 PMCID: PMC8959119 DOI: 10.1162/netn_a_00210] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Accepted: 09/17/2021] [Indexed: 11/29/2022] Open
Abstract
Stroke frequently produces attentional dysfunctions including symptoms of hemispatial neglect, which is characterized by a breakdown of awareness for the contralesional hemispace. Recent studies with functional MRI (fMRI) suggest that hemineglect patients display abnormal intra- and interhemispheric functional connectivity. However, since stroke is a vascular disorder and fMRI signals remain sensitive to nonneuronal (i.e., vascular) coupling, more direct demonstrations of neural network dysfunction in hemispatial neglect are warranted. Here, we utilize electroencephalogram (EEG) source imaging to uncover differences in resting-state network organization between patients with right hemispheric stroke (N = 15) and age-matched, healthy controls (N = 27), and determine the relationship between hemineglect symptoms and brain network organization. We estimated intra- and interregional differences in cortical communication by calculating the spectral power and amplitude envelope correlations of narrow-band EEG oscillations. We first observed focal frequency-slowing within the right posterior cortical regions, reflected in relative delta/theta power increases and alpha/beta/gamma decreases. Secondly, nodes within the right temporal and parietal cortex consistently displayed anomalous intra- and interhemispheric coupling, stronger in delta and gamma bands, and weaker in theta, alpha, and beta bands. Finally, a significant association was observed between the severity of left-hemispace search deficits (e.g., cancellation test omissions) and reduced functional connectivity within the alpha and beta bands. In sum, our novel results validate the hypothesis of large-scale cortical network disruption following stroke and reinforce the proposal that abnormal brain oscillations may be intimately involved in the pathophysiology of visuospatial neglect. Stroke patients often exhibit a disabling deficit of visual awareness in the hemifield opposite to their brain lesion, known as hemineglect. Recent studies with functional MRI (fMRI) suggest that hemineglect patients display abnormal functional coupling (i.e., connectivity) within and between brain hemispheres. However, since stroke is a vascular disorder and fMRI measures nonneuronal (i.e., vascular) coupling, we here provide direct evidence of neural network dysfunction in hemineglect by using electroencephalogram (EEG) source imaging, which measures the electrical fluctuations of large neuronal populations. Overall, we observed a breakdown of interhemispheric network connectivity within alpha/beta rhythms, which specifically correlated with the degree of patients’ hemispatial errors. The high temporal resolution and frequency content of EEG signals could lead to more sensitive markers and targeted rehabilitation approaches of hemineglect.
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Affiliation(s)
- Tomas Ros
- Department of Neuroscience, University of Geneva, Geneva, Switzerland
- CIBM Center for Biomedical Imaging, Geneva University Hospitals, Geneva, Switzerland
| | - Abele Michela
- Department of Neuroscience, University of Geneva, Geneva, Switzerland
| | - Anaïs Mayer
- Romand Clinic of Readaptation, SUVA, Sion, Switzerland
| | - Anne Bellmann
- Romand Clinic of Readaptation, SUVA, Sion, Switzerland
| | | | | | - Arnaud Saj
- Department of Neuroscience, University of Geneva, Geneva, Switzerland
- Department of Neurology, Geneva University Hospital, Geneva, Switzerland
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17
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Derbie AY, Chau BKH, Chan CCH. Functional and Structural Architectures of Allocentric and Egocentric Spatial Coding in Aging: A Combined DTI and fMRI Study. Front Neurol 2022; 12:802975. [PMID: 35153982 PMCID: PMC8831882 DOI: 10.3389/fneur.2021.802975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Accepted: 12/30/2021] [Indexed: 11/13/2022] Open
Abstract
BackgroundAging disrupts the optimal balance between neural nodes underlying orienting and attention control functions. Previous studies have suggested that age-related changes in cognitive process are associated to the changes in the myelinated fiber bundles, which affected the speed and actions of the signal propagation across different neural networks. However, whether the age-related difference in allocentric and egocentric spatial coding is accounted by the difference in white-matter integrity is unclear. In this study, using diffusion tensor imaging (DTI) and functional magnetic resonance imaging (fMRI), we sought to elucidate whether age-related differences in white matter integrity accounts for the difference in nodes to the distributed spatial coding-relevant brain networks.Material and MethodOlder (n = 24) and younger (n = 27) participants completed the structural DTI and fMRI scans during which they engaged in a cue-to-target task to elicit allocentric or egocentric processes.Results and ConclusionEfficient modulation of both allocentric and egocentric spatial coding in fronto-parietal attention network (FPAN) requires structure–function interaction. Allocentric task-modulated connectivity of the fronto-parietal network (FPN) and dorsal attention network (DAN) with the temporal lobe was influenced by the aging differences of the white-matter tracts of the posterior and superior corona radiata (PCR and SCR), respectively. On the other hand, aging difference of the superior longitudinal fasciculus mainly influenced the egocentric-task-modulated connections of the DAN and FPN with frontal regions and posterior cingulate cortex. This study suggested that functional connections of the FPAN with near and far task-relevant nodes vary significantly with age and conditions.
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Affiliation(s)
- Abiot Y. Derbie
- Applied Cognitive Neuroscience Laboratory, Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Kowloon, Hong Kong SAR, China
- Department of Psychology, Bahir Dar University, Bahir Dar, Ethiopia
- *Correspondence: Abiot Y. Derbie
| | - Bolton K. H. Chau
- Applied Cognitive Neuroscience Laboratory, Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Kowloon, Hong Kong SAR, China
| | - Chetwyn C. H. Chan
- Department of Psychology, The Education University of Hong Kong, Tai Po, Hong Kong SAR, China
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18
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Saxena S, Keser Z, Rorden C, Bonilha L, Fridriksson J, Walker A, Hillis AE. Disruptions of the Human Connectome Associated With Hemispatial Neglect. Neurology 2022; 98:e107-e114. [PMID: 35263271 PMCID: PMC8762585 DOI: 10.1212/wnl.0000000000013050] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Accepted: 11/02/2021] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND AND OBJECTIVES Hemispatial neglect is a heterogeneous and complex disorder that can be classified by frame of reference for "left" vs "right," including viewer-centered neglect (VCN, affecting the contralesional side of the view), stimulus-centered neglect (SCN, affecting the contralesional side of the stimulus, irrespective of its location with respect to the viewer), or both. We investigated the effect of acute stroke lesions on the connectivity of neural networks that underlie VCN or SCN. METHODS A total of 174 patients within 48 hours of acute right hemispheric infarct underwent a detailed hemispatial neglect assessment that included oral reading, scene copy, line cancellation, gap detection, horizontal line bisection tests, and MRI. Each patient's connectivity map was generated. We performed a linear association analysis between network connectivity strength and continuous measures of neglect to identify lesion-induced disconnections associated with the presence or severity of VCN and SCN. Results were corrected for multiple comparisons. RESULTS About 42% of the participants with right hemisphere stroke had at least one type of neglect. The presence of any type of neglect was associated with lesions to tracts connecting the right inferior parietal cortex, orbitofrontal cortex, and right thalamus to other right-hemispheric structures. VCN only was strongly associated with tracts connecting the right putamen to other brain regions and tracts connecting right frontal regions with other brain regions. The presence of both types of neglect was most strongly associated with tracts connecting the right inferior and superior parietal cortex to other brain regions and those connecting left or right mesial temporal cortex to other brain regions. DISCUSSION Our study provides new evidence for the specific white matter tracts where disruption can cause hemispatial neglect in a relatively large number of participants and homogeneous time after onset. We obtained MRI and behavioral testing acutely, before the opportunity for rehabilitation or substantial recovery. CLASSIFICATION OF EVIDENCE This study provides Class II evidence that damage to specific white matter tracts identified on MRI are associated with the presence of neglect following right hemispheric stroke.
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Affiliation(s)
- Sadhvi Saxena
- From the Departments of Neurology (S.S., Z.K., A.W., A.E.H.) and Physical and Medicine & Rehabilitation (A.E.H.), Johns Hopkins University School of Medicine, Baltimore, MD; Departments of Psychology (C.R.) and Communication Sciences and Disorders (J.F.), University of South Carolina, Columbia; Department of Neurology (L.B.), Medical University of South Carolina, Charleston; and Department of Cognitive Science (A.E.H.), Johns Hopkins University, Baltimore, MD
| | - Zafer Keser
- From the Departments of Neurology (S.S., Z.K., A.W., A.E.H.) and Physical and Medicine & Rehabilitation (A.E.H.), Johns Hopkins University School of Medicine, Baltimore, MD; Departments of Psychology (C.R.) and Communication Sciences and Disorders (J.F.), University of South Carolina, Columbia; Department of Neurology (L.B.), Medical University of South Carolina, Charleston; and Department of Cognitive Science (A.E.H.), Johns Hopkins University, Baltimore, MD
| | - Chris Rorden
- From the Departments of Neurology (S.S., Z.K., A.W., A.E.H.) and Physical and Medicine & Rehabilitation (A.E.H.), Johns Hopkins University School of Medicine, Baltimore, MD; Departments of Psychology (C.R.) and Communication Sciences and Disorders (J.F.), University of South Carolina, Columbia; Department of Neurology (L.B.), Medical University of South Carolina, Charleston; and Department of Cognitive Science (A.E.H.), Johns Hopkins University, Baltimore, MD
| | - Leonardo Bonilha
- From the Departments of Neurology (S.S., Z.K., A.W., A.E.H.) and Physical and Medicine & Rehabilitation (A.E.H.), Johns Hopkins University School of Medicine, Baltimore, MD; Departments of Psychology (C.R.) and Communication Sciences and Disorders (J.F.), University of South Carolina, Columbia; Department of Neurology (L.B.), Medical University of South Carolina, Charleston; and Department of Cognitive Science (A.E.H.), Johns Hopkins University, Baltimore, MD
| | - Julius Fridriksson
- From the Departments of Neurology (S.S., Z.K., A.W., A.E.H.) and Physical and Medicine & Rehabilitation (A.E.H.), Johns Hopkins University School of Medicine, Baltimore, MD; Departments of Psychology (C.R.) and Communication Sciences and Disorders (J.F.), University of South Carolina, Columbia; Department of Neurology (L.B.), Medical University of South Carolina, Charleston; and Department of Cognitive Science (A.E.H.), Johns Hopkins University, Baltimore, MD
| | - Alexandra Walker
- From the Departments of Neurology (S.S., Z.K., A.W., A.E.H.) and Physical and Medicine & Rehabilitation (A.E.H.), Johns Hopkins University School of Medicine, Baltimore, MD; Departments of Psychology (C.R.) and Communication Sciences and Disorders (J.F.), University of South Carolina, Columbia; Department of Neurology (L.B.), Medical University of South Carolina, Charleston; and Department of Cognitive Science (A.E.H.), Johns Hopkins University, Baltimore, MD
| | - Argye Elizabeth Hillis
- From the Departments of Neurology (S.S., Z.K., A.W., A.E.H.) and Physical and Medicine & Rehabilitation (A.E.H.), Johns Hopkins University School of Medicine, Baltimore, MD; Departments of Psychology (C.R.) and Communication Sciences and Disorders (J.F.), University of South Carolina, Columbia; Department of Neurology (L.B.), Medical University of South Carolina, Charleston; and Department of Cognitive Science (A.E.H.), Johns Hopkins University, Baltimore, MD.
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19
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Cojan Y, Saj A, Vuilleumier P. Brain Substrates for Distinct Spatial Processing Components Contributing to Hemineglect in Humans. Brain Sci 2021; 11:brainsci11121584. [PMID: 34942886 PMCID: PMC8699043 DOI: 10.3390/brainsci11121584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 11/06/2021] [Accepted: 11/13/2021] [Indexed: 11/16/2022] Open
Abstract
Several cortical and sub-cortical regions in the right hemisphere, particularly in parietal and frontal lobe, but also in temporal lobe and thalamus, are part of neural networks critically implicated in spatial and attentional functions. Damage to different sites within these networks can cause hemispatial neglect. The aim of this study was to identify the neural substrates of different spatial processing components that are known to contribute to neglect symptoms. First, three different spatial tasks (visual search, bisection, and visual memory) were tested in 27 patients with focal right brain-damage. Voxel-based lesion-symptom mapping was used to determine the relationships between specific sites of damage and severity of deficits in these three spatial tasks. Secondly, fMRI was used in 26 healthy controls who performed the same tasks. In the healthy group, fMRI results showed a differential activation of regions within the parietal and frontal lobes during bisection and visual search, respectively. In the patients, we confirmed a critical role of right lateral parietal cortex in bisection, but lesions in frontal and temporal lobe were more critical for visual search. These data support the existence of distinct components in spatial attentional processes that might be damaged to different degrees in neglect patients.
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Affiliation(s)
- Yann Cojan
- Laboratory for Behavioral Neurology and Imaging of Cognition, Neuroscience Department, University of Geneva, 1211 Geneva, Switzerland; (A.S.); (P.V.)
- CRIR/Institut Nazareth et Louis-Braille du CISSS de la Montérégie-Centre, Longueuil, QC J4K 5G4, Canada
- Correspondence:
| | - Arnaud Saj
- Laboratory for Behavioral Neurology and Imaging of Cognition, Neuroscience Department, University of Geneva, 1211 Geneva, Switzerland; (A.S.); (P.V.)
- CRIR/Institut Nazareth et Louis-Braille du CISSS de la Montérégie-Centre, Longueuil, QC J4K 5G4, Canada
- Department of Psychology, University of Montréal, Montréal, QC H3A 1G1, Canada
- Neurology Department, Neuropsychology Unit, University Hospital of Geneva, 1205 Geneva, Switzerland
| | - Patrik Vuilleumier
- Laboratory for Behavioral Neurology and Imaging of Cognition, Neuroscience Department, University of Geneva, 1211 Geneva, Switzerland; (A.S.); (P.V.)
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20
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Testing the structure of human cognitive ability using evidence obtained from the impact of brain lesions over abilities. INTELLIGENCE 2021. [DOI: 10.1016/j.intell.2021.101581] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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21
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Liouta E, Komaitis S, Koutsarnakis C, Katsaros V, Papadopoulos K, Drosos E, Kalyvas A, George S. Dissociation between visuospatial neglect assessment tasks and its neuroanatomical substrates: a case report. Neurocase 2021; 27:419-424. [PMID: 35038975 DOI: 10.1080/13554794.2021.1984538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Visuospatial neglect possesses significant heterogeneity in clinical features and neuroanatomical substrates. Behavioral dissociations on different neglect tasks have been reported in the past, and the investigation of their respective anatomical correlates at cortical and, to a lesser degree, subcortical levels has been attempted in stroke studies. We report a patient with a neoplasm occupying the right ventral post-central gyrus and anterior supramarginal gyrus. The patient was admitted preoperatively with dissociation on the performance of neglect tasks, showing clinical deficits in the line bisection task and clock drawing, but not on the cancelation task. The patient underwent an awake craniotomy for tumor excision. Intraoperative visuospatial mapping was employed by applying direct electrical stimulation (DES) to the supramarginal gyrus and the ventral branch of the superior longitudinal fasciculus (SLF III) during the line bisection task. According to our findings, DES was ineffective at the cortical level, but it induced strong rightward bias when applied subcortically at the SLF III. By combining our preoperative and intraoperative anatomical and clinical data, we suggest that the posterior part of the SLF III might have a distinct role in the perceptual component of neglect. Our findings are discussed within the context of previous literature supporting the notion that particular behavioral features of spatial neglect are mediated by different white-matter connections.
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Affiliation(s)
- Evangelia Liouta
- Neurosurgry Department, Athens Medical School, Evangelismos Hospital, Athens,Greece
| | - Spyridon Komaitis
- Neurosurgry Department, Athens Medical School, Evangelismos Hospital, Athens,Greece.,Athens Microneurosurgery Lab, Athens Medical School, Athens, Greece
| | - Christos Koutsarnakis
- Neurosurgry Department, Athens Medical School, Evangelismos Hospital, Athens,Greece.,Athens Microneurosurgery Lab, Athens Medical School, Athens, Greece
| | | | | | - Evangelos Drosos
- Neurosurgry Department, Athens Medical School, Evangelismos Hospital, Athens,Greece.,Athens Microneurosurgery Lab, Athens Medical School, Athens, Greece
| | - Aristotelis Kalyvas
- Neurosurgry Department, Athens Medical School, Evangelismos Hospital, Athens,Greece.,Athens Microneurosurgery Lab, Athens Medical School, Athens, Greece
| | - Stranjalis George
- Neurosurgry Department, Athens Medical School, Evangelismos Hospital, Athens,Greece.,Athens Microneurosurgery Lab, Athens Medical School, Athens, Greece
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22
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Saj A, Pierce JE, Ronchi R, Ros T, Thomasson M, Bernati T, Van De Ville D, Serino A, Vuilleumier P. Real-time fMRI and EEG neurofeedback: A perspective on applications for the rehabilitation of spatial neglect. Ann Phys Rehabil Med 2021; 64:101561. [PMID: 34311120 DOI: 10.1016/j.rehab.2021.101561] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Revised: 07/06/2021] [Accepted: 07/10/2021] [Indexed: 01/20/2023]
Abstract
Spatial neglect is a neuropsychological syndrome characterized by a failure to orient, perceive, and act toward the contralesional side of the space after brain injury. Neglect is one of the most frequent and disabling neuropsychological syndromes following right-hemisphere damage, often persisting in the chronic phase and responsible for a poor functional outcome at hospital discharge. Different rehabilitation approaches have been proposed over the past 60 years, with a variable degree of effectiveness. In this point-of-view article, we describe a new rehabilitation technique for spatial neglect that directly targets brain activity and pathological physiological processes: namely, neurofeedback (NFB) with real-time brain imaging methodologies. In recent proof-of-principle studies, we have demonstrated the potential of this rehabilitation technique. Using real-time functional MRI (rt-fMRI) NFB in chronic neglect, we demonstrated that patients are able to upregulate their right visual cortex activity, a response that is otherwise reduced due to losses in top-down attentional signals. Using real-time electroencephalography NFB in patients with acute or chronic condition, we showed successful regulation with partial restoration of brain rhythm dynamics over the damaged hemisphere. Both approaches were followed by mild, but encouraging, improvement in neglect symptoms. NFB techniques, by training endogenous top-down modulation of attentional control on sensory processing, might induce sustained changes at both the neural and behavioral levels, while being non-invasive and safe. However, more properly powered clinical studies with control groups and longer follow-up are needed to fully establish the effectiveness of the techniques, identify the most suitable candidates, and determine how the techniques can be optimized or combined in the context of rehabilitation.
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Affiliation(s)
- Arnaud Saj
- University of Montreal, Psychology Department, Montreal, QC, Canada; University Hospital of Geneva, Neuropsychology Unit, Geneva, Switzerland.
| | - Jordan E Pierce
- Laboratory for Behavioral Neurology and Imaging of Cognition, Neuroscience Department, University of Geneva, Geneva, Switzerland
| | - Roberta Ronchi
- University Hospital of Geneva, Neuropsychology Unit, Geneva, Switzerland; Laboratory for Behavioral Neurology and Imaging of Cognition, Neuroscience Department, University of Geneva, Geneva, Switzerland
| | - Tomas Ros
- Laboratory for Behavioral Neurology and Imaging of Cognition, Neuroscience Department, University of Geneva, Geneva, Switzerland
| | - Marine Thomasson
- Clinical and Experimental Neuropsychology Laboratory, Department of Psychology, University of Geneva, Geneva, Switzerland
| | - Thérèse Bernati
- University Hospital of Geneva, Neuropsychology Unit, Geneva, Switzerland
| | - Dimitri Van De Ville
- Department of Radiology and Medical Informatics, University of Geneva, Geneva, Switzerland; Institute of Bioengineering, Center for Neuroprosthetics, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - Andrea Serino
- Department of Clinical Neurosciences, University Hospital of Lausanne, Lausanne, Switzerland; Center for Neuroprosthetics, Ecole Polytechnique Fédérale de Lausanne, Geneva, Switzerland
| | - Patrik Vuilleumier
- Laboratory for Behavioral Neurology and Imaging of Cognition, Neuroscience Department, University of Geneva, Geneva, Switzerland
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23
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Left egocentric neglect in early subacute right-stroke patients is related to damage of the superior longitudinal fasciculus. Brain Imaging Behav 2021; 16:211-218. [PMID: 34328618 PMCID: PMC8825605 DOI: 10.1007/s11682-021-00493-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/28/2021] [Indexed: 11/16/2022]
Abstract
A typical consequence of stroke in the right hemisphere is unilateral spatial neglect. Distinct forms of neglect have been described, such as space-based (egocentric) and object-based (allocentric) neglect. However, the relationship between these two forms of neglect is still far from being understood, as well as their neural substrates. Here, we further explore this issue by using voxel lesion symptoms mapping (VLSM) analyses on a large sample of early subacute right-stroke patients assessed with the Apples Cancellation Test. This is a sensitive test that simultaneously measures both egocentric and allocentric neglect. Behaviourally, we found no correlation between egocentric and allocentric performance, indicating independent mechanisms supporting the two forms of neglect. This was confirmed by the VLSM analysis that pointed out a link between a damage in the superior longitudinal fasciculus and left egocentric neglect. By contrast, no association was found between brain damage and left allocentric neglect. These results indicate a higher probability to observe egocentric neglect as a consequence of white matter damages in the superior longitudinal fasciculus, while allocentric neglect appears more “globally” related to the whole lesion map. Overall, these findings on early subacute right-stroke patients highlight the role played by white matter integrity in sustaining attention-related operations within an egocentric frame of reference.
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24
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Takamura Y, Fujii S, Ohmatsu S, Ikuno K, Tanaka K, Manji A, Abe H, Morioka S, Kawashima N. Interaction between spatial neglect and attention deficit in patients with right hemisphere damage. Cortex 2021; 141:331-346. [PMID: 34126288 DOI: 10.1016/j.cortex.2021.03.036] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Revised: 02/28/2021] [Accepted: 03/22/2021] [Indexed: 11/26/2022]
Abstract
Unilateral spatial neglect (USN) was originally regarded as a parietal syndrome, but it has become evident that USN is a disturbance in the widespread attention network. Here, we focused on an interaction between spatial neglect and non-spatial aspect of attention deficit, and aimed to establish a novel evaluation approach based on the characteristics of the spatial distribution of reaction times. We tested 174 patients with right hemisphere damage and divided them based on their prescreening scores on the Behavioral Inattention Test (BIT): (1) USN++ (n = 79: BIT<131), (2) USN+ (n = 47: BIT≥131 with history of USN), and (3) RHD (n = 48: without neglect symptom). The patients were asked to conduct a touch panel-based pointing task toward 2D-arranged (seven columns × five rows) circular targets on a PC monitor, and the reaction time to each object was recorded. To evaluate aspects of attention deficit and neglect symptoms, we calculated the total average of the reaction time for all objects (RTmean) and the ratios of the right and left space (L/Rratio), respectively. The results revealed that RTmean and L/Rratio can be regarded as independent evaluation parameters for attention deficit and neglect symptoms, respectively. Voxel-based lesion-symptom mapping based on RTmean and L/Rratio values revealed relevant lesions with attention-related brain areas (middle temporal gyrus, angular gyrus, and inferior frontal gyrus), and neglect-related brain areas (superior temporal gyrus and superior longitudinal fascicules). A cluster analysis with Gaussian mixture model detected six different states of USN with an interaction between neglect symptoms and attention deficit. Interestingly, the recovery process after USN can be properly explained by the transition pattern from one cluster to another. Our results suggest that a novel evaluation approach to distinguish between neglect symptoms and attention deficit, namely the characterization of the interaction between RTmean and L/Rratio, provides useful information for understanding pathological features of USN.
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Affiliation(s)
- Yusaku Takamura
- Department of Rehabilitation for the Movement Functions, Research Institute of National Rehabilitation Center for Persons with Disabilities, Tokorozawa, Saitama, Japan; Graduate School of Health Sciences, Kio University, Nara, Japan
| | - Shintaro Fujii
- Graduate School of Health Sciences, Kio University, Nara, Japan; Nishiyamato Rehabilitation Hospital, Nara, Japan
| | - Satoko Ohmatsu
- Department of Rehabilitation for the Movement Functions, Research Institute of National Rehabilitation Center for Persons with Disabilities, Tokorozawa, Saitama, Japan; Regenerative Rehabilitation Section of Department of Rehabilitation, Hospital of National Rehabilitation Center for Persons with Disabilities, Saitama, Japan
| | - Koki Ikuno
- Nishiyamato Rehabilitation Hospital, Nara, Japan
| | - Kohei Tanaka
- Shizuoka Rehabilitation Hospital, Shizuoka, Japan
| | - Atsushi Manji
- Saitama Misato Rehabilitation Hospital, Saitama, Japan
| | | | - Shu Morioka
- Graduate School of Health Sciences, Kio University, Nara, Japan; Neurorehabilitation Research Center, Kio University, Nara, Japan
| | - Noritaka Kawashima
- Department of Rehabilitation for the Movement Functions, Research Institute of National Rehabilitation Center for Persons with Disabilities, Tokorozawa, Saitama, Japan; Regenerative Rehabilitation Section of Department of Rehabilitation, Hospital of National Rehabilitation Center for Persons with Disabilities, Saitama, Japan.
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25
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Kessner SS, Schlemm E, Gerloff C, Thomalla G, Cheng B. Grey and white matter network disruption is associated with sensory deficits after stroke. NEUROIMAGE-CLINICAL 2021; 31:102698. [PMID: 34023668 PMCID: PMC8163991 DOI: 10.1016/j.nicl.2021.102698] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/07/2020] [Revised: 05/07/2021] [Accepted: 05/08/2021] [Indexed: 12/04/2022]
Abstract
Somatosensory deficits occur in about 60% of patients after ischaemic stroke. Clinical and imaging data of 101 ischaemic stroke patients were analysed. Stroke lesions may disrupt grey (GM) and/or white matter (WM) network. Lesion volume explains 23% of sensory deficit variance; GM / WM disruption adds 14% Subnetwork of postcentral, supramarginal, transverse temporal gyri involved.
Somatosensory deficits after ischaemic stroke are common and can occur in patients with lesions in the anterior parietal cortex and subcortical nuclei. It is less clear to what extent damage to white matter tracts within the somatosensory system may contribute to somatosensory deficits after stroke. We compared the roles of cortical damage and disruption of subcortical white matter tracts as correlates of somatosensory deficit after ischaemic stroke. Clinical and imaging data were assessed in incident stroke patients. Somatosensory deficits were measured using a standardized somatosensory test. Remote effects were quantified by projecting the MRI-based segmented stroke lesions onto a predefined atlas of white matter connectivity. Direct ischaemic damage to grey matter was computed by lesion overlap with grey matter areas. The association between lesion impact scores and sensory deficit was assessed statistically. In 101 patients, median sensory score was 188/193 (97.4%). Lesion volume was associated with somatosensory deficit, explaining 23.3% of variance. Beyond this, the stroke-induced grey and white matter disruption within a subnetwork of the postcentral, supramarginal, and transverse temporal gyri explained an additional 14% of the somatosensory outcome variability. On mutual comparison, white matter network disruption was a stronger predictor than grey matter damage. Ischaemic damage to both grey and white matter are structural correlates of acute somatosensory disturbance after ischaemic stroke. Our data suggest that white matter integrity of a somatosensory network of primary and secondary cortex is a prerequisite for normal processing of somatosensory inputs and might be considered as an additional parameter for stroke outcome prediction in the future.
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Affiliation(s)
- Simon S Kessner
- Department of Neurology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
| | - Eckhard Schlemm
- Department of Neurology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
| | - Christian Gerloff
- Department of Neurology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Götz Thomalla
- Department of Neurology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Bastian Cheng
- Department of Neurology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
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26
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Nakajima R, Kinoshita M, Shinohara H, Nakada M. The superior longitudinal fascicle: reconsidering the fronto-parietal neural network based on anatomy and function. Brain Imaging Behav 2021; 14:2817-2830. [PMID: 31468374 DOI: 10.1007/s11682-019-00187-4] [Citation(s) in RCA: 87] [Impact Index Per Article: 29.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Due primarily to the extensive disposition of fibers and secondarily to the methodological preferences of researchers, the superior longitudinal fasciculus (SLF) subdivisions have multiple names, complicating SLF research. Here, we collected and reassessed existing knowledge regarding the SLF, which we used to propose a four-term classification of the SLF based mainly on function: dorsal SLF, ventral SLF, posterior SLF, and arcuate fasciculus (AF); these correspond to the traditional SLF II, SLF III or anterior AF, temporoparietal segment of the SLF or posterior AF, and AF or AF long segment, respectively. Each segment has a distinct functional role. The dorsal SLF is involved in visuospatial attention and motor control, while the ventral SLF is associated with language-related networks, auditory comprehension, and articulatory processing in the left hemisphere. The posterior SLF is involved in language-related processing, including auditory comprehension, reading, and lexical access, while the AF is associated with language-related activities, such as phonological processing; the right AF plays a role in social cognition and visuospatial attention. This simple proposed classification permits a better understanding of the SLF and may comprise a convenient classification for use in research and clinical practice relating to brain function.
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Affiliation(s)
- Riho Nakajima
- Department of Occupational therapy, Faculty of Health Sciences, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan
| | - Masashi Kinoshita
- Department of Neurosurgery, Faculty of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8641, Japan
| | | | - Mitsutoshi Nakada
- Department of Neurosurgery, Faculty of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8641, Japan.
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27
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White matter network disruption and cognitive correlates underlying impaired memory awareness in mild cognitive impairment. NEUROIMAGE-CLINICAL 2021; 30:102626. [PMID: 33780863 PMCID: PMC8039854 DOI: 10.1016/j.nicl.2021.102626] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 02/03/2021] [Accepted: 03/05/2021] [Indexed: 11/20/2022]
Abstract
Episodic memory deficits are insufficient for explaining memory anosognosia in MCI. Reasoning ability can be used as a basis for identifying memory anosognosia in MCI. Memory anosognosia in MCI is a white matter disconnection syndrome. Frontal-subcortical and callosal fibers are linked to memory anosognosia in MCI.
Decreased awareness of memory declines in mild cognitive impairment (MCI) has been linked to structural or functional changes in a wide gray matter network; however, the underlying white matter pathway correlations for the memory awareness deficits remain unknown. Moreover, consistent findings have not been obtained regarding the cognitive basis of disturbed awareness of memory declines in MCI. Due to the methodological drawbacks (e.g., correlational analysis without controlling confounders related to clinical status, a problem related to the representativeness of the control group) of previous studies on the aforementioned topic, further investigation is required. To addressed the research gaps, this study investigated white matter microstructural integrity and the cognitive correlates of memory awareness in 87 older adults with or without mild cognitive impairment (MCI). The patients with MCI and healthy controls (HCs) were divided into two subgroups, namely those with normal awareness (NA) and poor awareness (PA) for memory deficit, according to the discrepancy scores calculated from the differences between subjective and objective memory evaluations. Only the results for HCs with NA (HC-NA) were compared with those for the two MCI groups (i.e., MCI-NA and MCI-PA). The three groups were matched on demographic and clinical variables. An advanced diffusion imaging technique—diffusion spectrum imaging—was used to investigate the integrity of the white matter tract. The results revealed that although the HC-NA group outperformed the two MCI groups on several cognitive tests, the two MCI groups exhibited comparable performance across different neuropsychological tests, except for the test on reasoning ability. Compared with the other two groups, the MCI-PA group exhibited lower integrity in bilateral frontal-striatal fibers, left anterior thalamocortical radiations, and callosal fibers connecting bilateral inferior parietal regions. These results could not be explained by gray matter morphometric differences. Overall, the results indicated that mnemonic anosognosia was not sufficient to explain the memory awareness deficits observed in the patients with MCI. Our brain imaging findings also support the concept of anosognosia for memory deficit as a disconnection syndrome in MCI.
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28
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Pierce JE, Ronchi R, Thomasson M, Rossi I, Casati C, Saj A, Vallar G, Vuilleumier P. A novel computerized assessment of manual spatial exploration in unilateral spatial neglect. Neuropsychol Rehabil 2021; 32:1099-1120. [PMID: 33478363 DOI: 10.1080/09602011.2021.1875850] [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] [Indexed: 12/11/2022]
Abstract
Unilateral spatial neglect is a neuropsychological syndrome commonly observed after stroke and defined by the inability to attend or respond to contralesional stimuli. Typically, symptoms are assessed using clinical tests that rely upon visual/perceptual abilities. However, neglect may affect high-level representations controlling attention in other modalities as well. Here we developed a novel manual exploration test using a touch screen computer to quantify spatial search behaviour without visual input. Twelve chronic stroke patients with left neglect and 27 patients without neglect (based on clinical tests) completed our task. Four of the 12 "neglect" patients exhibited clear signs of neglect on our task as compared to "non-neglect" patients and healthy controls, and six other patients (from both groups) also demonstrated signs of neglect compared to healthy controls only. While some patients made asymmetrical responses on only one task, generally, patients with the strongest neglect performed poorly on multiple tasks. This suggests that representations associated with different modalities may be affected separately, but that severe forms of neglect are more likely related to damage in a common underlying representation. Our manual exploration task is easy to administer and can be added to standard neglect screenings to better measure symptom severity.
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Affiliation(s)
- Jordan E Pierce
- Laboratory for Behavioral Neurology and Imaging of Cognition, Department of Neuroscience, University of Geneva, Switzerland
| | - Roberta Ronchi
- Laboratory for Behavioral Neurology and Imaging of Cognition, Department of Neuroscience, University of Geneva, Switzerland.,Department of Clinical Neurosciences, University Hospital of Geneva, Switzerland
| | - Marine Thomasson
- Department of Clinical Neurosciences, University Hospital of Geneva, Switzerland.,Clinical and Experimental Neuropsychology Laboratory, Department of Psychology and Educational Sciences, University of Geneva, Switzerland
| | - Irene Rossi
- Neuropsychological Laboratory, IRCCS Istituto Auxologico Italiano, Milano, Italy.,Dept. of Neurorehabilitation Sciences, IRCCS Istituto Auxologico Italiano, Milano, Italy
| | - Carlotta Casati
- Neuropsychological Laboratory, IRCCS Istituto Auxologico Italiano, Milano, Italy.,Dept. of Neurorehabilitation Sciences, IRCCS Istituto Auxologico Italiano, Milano, Italy
| | - Arnaud Saj
- Department of Psychology, University of Montreal, Canada
| | - Giuseppe Vallar
- Neuropsychological Laboratory, IRCCS Istituto Auxologico Italiano, Milano, Italy.,Department of Psychology, University of Milano-Bicocca, Milano, Italy
| | - Patrik Vuilleumier
- Laboratory for Behavioral Neurology and Imaging of Cognition, Department of Neuroscience, University of Geneva, Switzerland
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29
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Wang Y, Wang X, Shi H, Xia L, Dong J, Nguchu BA, Uwisengeyimana JDD, Liu Y, Zhang D, Feng L, Qiu B. Microstructural properties of major white matter tracts in constant exotropia before and after strabismus surgery. Br J Ophthalmol 2021; 106:870-877. [PMID: 33468491 DOI: 10.1136/bjophthalmol-2020-317948] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Revised: 12/08/2020] [Accepted: 01/04/2021] [Indexed: 11/04/2022]
Abstract
AIMS The purpose of this study was to explore the microstructural properties of the major white matter (WM) tracts in constant exotropia (XT) before and after strabismus surgery, and further investigate the association between microstructural alterations and the ocular dominance (OD). METHODS We collected diffusion tensor imaging data of patients with XT before (n=19) and after (n=15) strabismus surgery and 20 healthy controls and evaluated OD and stereopsis. The probabilistic streamline tractography of the 24 major WM tracts was reconstructed by using the automated fibre quantification package. Fractional anisotropy and mean diffusivity (MD) along each tract were estimated, and their differences between the groups were examined. Furthermore, we evaluated the relationship between OD and the absolute value of altered microstructural parameters. RESULTS While all postoperative XT patients restored normal stereopsis, most of their OD remained aberrant (9 out of 11). Compared with that of preoperation, the MD of postoperative patients decreased significantly along left anterior thalamic radiation (ATR), left arcuate fasciculus (AF), left corticospinal tract (CST), left cingulum cingulate (CGC) and left inferior fronto-occipital fasciculus. Moreover, OD was negatively correlated with the absolute value of MD changes in left ATR, left AF, left CST and left CGC. CONCLUSION Microstructural alterations after surgery in the visuospatial network tracts may contribute to the stereopsis restoration. Additionally, the results of the correlation analysis may signify that the balanced binocular input may be more conducive for the restoration and improvement of binocular visual function, including stereopsis. Thus, restoring normal ocular balance after surgical correction may be necessary to achieve more substantial improvements.
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Affiliation(s)
- Yanming Wang
- Hefei National Laboratory for Physical Sciences at the Microscale and the Centers for Biomedical Engineering, University of Science and Technology of China, Hefei, Anhui, China
| | - Xiaoxiao Wang
- Hefei National Laboratory for Physical Sciences at the Microscale and the Centers for Biomedical Engineering, University of Science and Technology of China, Hefei, Anhui, China
| | - Hongmei Shi
- Department of Ophthalmology, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, China.,Department of Ophthalmology, The People's Hospital of Bozhou, Bozhou, Anhui, China
| | - Lin Xia
- Department of Ophthalmology, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, China
| | - Jiong Dong
- Department of Ophthalmology, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, China
| | - Benedictor Alexander Nguchu
- Hefei National Laboratory for Physical Sciences at the Microscale and the Centers for Biomedical Engineering, University of Science and Technology of China, Hefei, Anhui, China
| | - Jean De Dieu Uwisengeyimana
- Hefei National Laboratory for Physical Sciences at the Microscale and the Centers for Biomedical Engineering, University of Science and Technology of China, Hefei, Anhui, China
| | - Yanpeng Liu
- Hefei National Laboratory for Physical Sciences at the Microscale and the Centers for Biomedical Engineering, University of Science and Technology of China, Hefei, Anhui, China
| | - Du Zhang
- Hefei National Laboratory for Physical Sciences at the Microscale and the Centers for Biomedical Engineering, University of Science and Technology of China, Hefei, Anhui, China
| | - Lixia Feng
- Department of Ophthalmology, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, China
| | - Bensheng Qiu
- Hefei National Laboratory for Physical Sciences at the Microscale and the Centers for Biomedical Engineering, University of Science and Technology of China, Hefei, Anhui, China
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30
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Disconnection somewhere down the line: Multivariate lesion-symptom mapping of the line bisection error. Cortex 2020; 133:120-132. [PMID: 33120190 DOI: 10.1016/j.cortex.2020.09.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Revised: 06/17/2020] [Accepted: 09/04/2020] [Indexed: 11/23/2022]
Abstract
Line Bisection is a simple task frequently used in stroke patients to diagnose disorders of spatial perception characterized by a directional bisection bias to the ipsilesional side. However, previous anatomical and behavioural findings are contradictory, and the diagnostic validity of the line bisection task has been challenged. We hereby aimed to re-analyse the anatomical basis of pathological line bisection by using multivariate lesion-symptom mapping and disconnection-symptom mapping based on support vector regression in a sample of 163 right hemispheric acute stroke patients. In line with some previous studies, we observed that pathological line bisection was related to more than a single focal lesion location. Cortical damage primarily to right parietal areas, particularly the inferior parietal lobe, including the angular gyrus, as well as damage to the right basal ganglia contributed to the pathology. In contrast to some previous studies, an involvement of frontal cortical brain areas in the line bisection task was not observed. Subcortically, damage to the right superior longitudinal fasciculus (I, II and III) and arcuate fasciculus as well as the internal capsule was associated with line bisection errors. Moreover, white matter damage of interhemispheric fibre bundles, such as the anterior commissure and posterior parts of the corpus callosum projecting into the left hemisphere, was predictive of pathological deviation in the line bisection task.
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31
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The reliability of pseudoneglect is task dependent. Neuropsychologia 2020; 148:107618. [PMID: 32891646 PMCID: PMC7718110 DOI: 10.1016/j.neuropsychologia.2020.107618] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Revised: 08/31/2020] [Accepted: 09/01/2020] [Indexed: 11/29/2022]
Abstract
Bisection tasks that require individuals to identify the midpoint of a line are often used to assess the presence of biases to spatial attention in both healthy and patient populations. These tasks have helped to uncover a phenomenon called pseudoneglect, a bias towards the left-side of space in healthy individuals. First identified in the tactile domain, pseudoneglect has been subsequently demonstrated in other sensory modalities such as vision. Despite this, the specific reliability of pseudoneglect within individuals across tasks and time has been investigated very little. In this study, we investigated the reliability of response bias within individuals across four separate testing sessions and during three line bisection tasks: landmark, line bisection and tactile rod bisection. Strong reliability was expected within individuals across task and session. Pseudoneglect was found when response bias was averaged across all tasks, for the entire sample. However, individual data showed biases to both left and right, with some participants showing no clear bias, demonstrating individual differences in bias. Significant, cross-session within-individual reliability was found for the landmark and tactile rod bisection tasks respectively, but no significant reliability was observed for the line bisection task. These results highlight the inconsistent nature of pseudoneglect within individuals, particularly across sensory modality. They also provide strong support for the use of the landmark task as the most reliable measure of pseudoneglect. Reliability of pseudoneglect was assessed across 4 sessions and 3 tasks. The landmark task was the most reliable test for pseudoneglect across sessions. Responses to line bisection and tactile rod were less reliable across sessions. Responses to different bisection tasks in the same individuals were not reliable.
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32
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Suarez A, Saxena S, Oishi K, Oishi K, Walker A, Rorden C, Hillis AE. Influence of age, lesion volume, and damage to dorsal versus ventral streams to viewer- and stimulus-centered hemispatial neglect in acute right hemisphere stroke. Cortex 2020; 126:73-82. [PMID: 32062471 PMCID: PMC7201372 DOI: 10.1016/j.cortex.2019.12.030] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Revised: 11/04/2019] [Accepted: 12/10/2019] [Indexed: 11/21/2022]
Abstract
We studied 156 individuals with acute, right hemisphere ischemic stroke on a battery of hemispatial neglect tests to distinguish between viewer-centered and stimulus-centered neglect and MRI diffusion weighted imaging. We identified the relative contributions of age, total lesion volume, and damage to subcortical and cortical grey matter regions as well as white matter tracts to both the severity and presence of significant viewer-centered and stimulus-centered neglect, using multivariable regression tests. We found that age, volume of lesion, and percent damage to the regions of interest were each independently associated with the severity of viewer-centered neglect (r2 = .31; p < .0001). However, only age (t = 3.20; p = .002) and percent damage to the angular gyrus (t = 2.63, p = .010), a dorsal stream area, predicted severity of viewer-centered neglect independently of the other variables. The same variables predicted the presence of significant viewer-centered neglect. In contrast, these variables did not significantly predict the severity of stimulus-centered neglect. However, we found that percent damage to ventral stream regions of interest (middle temporal gyrus, inferior temporal gyrus, fusiform gyrus, inferior frontal occipital gyrus, sagittal stratum, along with total infarct volume were associated with the presence of significant stimulus-centered neglect (pseudo r2 = .70, p < .0004). Only percent damage to right inferior temporal gyrus predicted stimulus-centered neglect independently of the other variables (p = .018).
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Affiliation(s)
- Adrian Suarez
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Sadhvi Saxena
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Kenichi Oishi
- Department of Radiology, Johns Hopkins University School of Medicine, Baltimore, MD, USA; Center for Imaging Science, Johns Hopkins University, Baltimore, MD, USA; Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD, USA
| | - Kumiko Oishi
- Department of Radiology, Johns Hopkins University School of Medicine, Baltimore, MD, USA; Center for Imaging Science, Johns Hopkins University, Baltimore, MD, USA; Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD, USA
| | - Alexandra Walker
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Chris Rorden
- Department of Psychology, University of South Carolina, Columbia, SC, USA
| | - Argye E Hillis
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA; Department of Physical Medicine and Rehabilitation, Johns Hopkins University School of Medicine, Baltimore, MD, USA; Department of Cognitive Science, Krieger School of Arts and Sciences, Johns Hopkins University, Baltimore, MD, USA.
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33
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Dias JW, McClaskey CM, Eckert MA, Jensen JH, Harris KC. Intra- and interhemispheric white matter tract associations with auditory spatial processing: Distinct normative and aging effects. Neuroimage 2020; 215:116792. [PMID: 32278895 PMCID: PMC7292771 DOI: 10.1016/j.neuroimage.2020.116792] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Revised: 02/20/2020] [Accepted: 03/20/2020] [Indexed: 12/18/2022] Open
Abstract
Declining auditory spatial processing is hypothesized to contribute to the difficulty older adults have detecting, locating, and selecting a talker from among others in noisy listening environments. Though auditory spatial processing has been associated with several cortical structures, little is known regarding the underlying white matter architecture or how age-related changes in white matter microstructure may affect it. The arcuate fasciculus is a target for understanding age-related differences in auditory spatial attention based on normative spatial attention findings in humans. Similarly, animal and human clinical studies suggest that the corpus callosum plays a role in the cross-hemispheric integration of auditory spatial information important for spatial localization and attention. The current investigation used diffusion imaging to examine the extent to which age-group differences in the identification of spatially cued speech were accounted for by individual differences in the white matter microstructure of the right arcuate fasciculus and the corpus callosum. Higher right arcuate and callosal fractional anisotropy (FA) predicted better segregation and identification of spatially cued speech across younger and older listeners. Further, individual differences in callosal microstructure mediated age-group differences in auditory spatial processing. Follow-up analyses suggested that callosal tracts connecting left and right pre-frontal and posterior parietal cortex are particularly important for auditory spatial processing. The results are consistent with previous work in animals and clinical human samples and provide a cortical mechanism to account for age-related deficits in auditory spatial processing. Further, the results suggest that both intrahemispheric and interhemispheric mechanisms are involved in auditory spatial processing.
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34
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The influence of subcortical shortcuts on disordered sensory and cognitive processing. Nat Rev Neurosci 2020; 21:264-276. [PMID: 32269315 DOI: 10.1038/s41583-020-0287-1] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/28/2020] [Indexed: 12/14/2022]
Abstract
The very earliest stages of sensory processing have the potential to alter how we perceive and respond to our environment. These initial processing circuits can incorporate subcortical regions, such as the thalamus and brainstem nuclei, which mediate complex interactions with the brain's cortical processing hierarchy. These subcortical pathways, many of which we share with other animals, are not merely vestigial but appear to function as 'shortcuts' that ensure processing efficiency and preservation of vital life-preserving functions, such as harm avoidance, adaptive social interactions and efficient decision-making. Here, we propose that functional interactions between these higher-order and lower-order brain areas contribute to atypical sensory and cognitive processing that characterizes numerous neuropsychiatric disorders.
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35
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Toba MN, Zavaglia M, Malherbe C, Moreau T, Rastelli F, Kaglik A, Valabrègue R, Pradat-Diehl P, Hilgetag CC, Valero-Cabré A. Game theoretical mapping of white matter contributions to visuospatial attention in stroke patients with hemineglect. Hum Brain Mapp 2020; 41:2926-2950. [PMID: 32243676 PMCID: PMC7336155 DOI: 10.1002/hbm.24987] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Revised: 02/24/2020] [Accepted: 03/06/2020] [Indexed: 01/19/2023] Open
Abstract
White matter bundles linking gray matter nodes are key anatomical players to fully characterize associations between brain systems and cognitive functions. Here we used a multivariate lesion inference approach grounded in coalitional game theory (multiperturbation Shapley value analysis, MSA) to infer causal contributions of white matter bundles to visuospatial orienting of attention. Our work is based on the characterization of the lesion patterns of 25 right hemisphere stroke patients and the causal analysis of their impact on three neuropsychological tasks: line bisection, letter cancellation, and bells cancellation. We report that, out of the 11 white matter bundles included in our MSA coalitions, the optic radiations, the inferior fronto-occipital fasciculus and the anterior cingulum were the only tracts to display task-invariant contributions (positive, positive, and negative, respectively) to the tasks. We also report task-dependent influences for the branches of the superior longitudinal fasciculus and the posterior cingulum. By extending prior findings to white matter tracts linking key gray matter nodes, we further characterize from a network perspective the anatomical basis of visual and attentional orienting processes. The knowledge about interactions patterns mediated by white matter tracts linking cortical nodes of attention orienting networks, consolidated by further studies, may help develop and customize brain stimulation approaches for the rehabilitation of visuospatial neglect.
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Affiliation(s)
- Monica N Toba
- Cerebral Dynamics, Plasticity and Rehabilitation Team, Frontlab, Paris Brain Institute, ICM, Sorbonne Universités, UPMC Paris 06, Inserm UMR S 1127, CNRS UMR 7225, F-75013, & IHU-A-ICM, Paris, France.,Institute of Computational Neuroscience, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,AP-HP, HxU Pitié-Salpêtrière-Charles-Foix, service de Médecine Physique et de Réadaptation & PHRC Régional NEGLECT, Paris, France.,Laboratory of Functional Neurosciences (EA 4559), University of Picardie Jules Verne, Amiens, France
| | - Melissa Zavaglia
- Institute of Computational Neuroscience, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,Jacobs University, Focus Area Health, Bremen, Germany
| | - Caroline Malherbe
- Institute of Computational Neuroscience, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,Department of Neurology, Head and Neuro Center, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Tristan Moreau
- Cerebral Dynamics, Plasticity and Rehabilitation Team, Frontlab, Paris Brain Institute, ICM, Sorbonne Universités, UPMC Paris 06, Inserm UMR S 1127, CNRS UMR 7225, F-75013, & IHU-A-ICM, Paris, France
| | - Federica Rastelli
- Cerebral Dynamics, Plasticity and Rehabilitation Team, Frontlab, Paris Brain Institute, ICM, Sorbonne Universités, UPMC Paris 06, Inserm UMR S 1127, CNRS UMR 7225, F-75013, & IHU-A-ICM, Paris, France.,AP-HP, HxU Pitié-Salpêtrière-Charles-Foix, service de Médecine Physique et de Réadaptation & PHRC Régional NEGLECT, Paris, France
| | - Anna Kaglik
- Cerebral Dynamics, Plasticity and Rehabilitation Team, Frontlab, Paris Brain Institute, ICM, Sorbonne Universités, UPMC Paris 06, Inserm UMR S 1127, CNRS UMR 7225, F-75013, & IHU-A-ICM, Paris, France.,AP-HP, HxU Pitié-Salpêtrière-Charles-Foix, service de Médecine Physique et de Réadaptation & PHRC Régional NEGLECT, Paris, France
| | - Romain Valabrègue
- Centre for NeuroImaging Research-CENIR, Paris Brain Institute, ICM, Sorbonne Universités, Inserm UMR S 1127, CNRS UMR 7225, F-75013, Paris, France
| | - Pascale Pradat-Diehl
- AP-HP, HxU Pitié-Salpêtrière-Charles-Foix, service de Médecine Physique et de Réadaptation & PHRC Régional NEGLECT, Paris, France.,GRC-UPMC n° 18-Handicap cognitif et réadaptation, Paris, France
| | - Claus C Hilgetag
- Institute of Computational Neuroscience, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,Department of Health Sciences, Boston University, 635 Commonwealth Ave., Boston, Massachusetts, 02215, USA
| | - Antoni Valero-Cabré
- Cerebral Dynamics, Plasticity and Rehabilitation Team, Frontlab, Paris Brain Institute, ICM, Sorbonne Universités, UPMC Paris 06, Inserm UMR S 1127, CNRS UMR 7225, F-75013, & IHU-A-ICM, Paris, France.,AP-HP, HxU Pitié-Salpêtrière-Charles-Foix, service de Médecine Physique et de Réadaptation & PHRC Régional NEGLECT, Paris, France.,Laboratory for Cerebral Dynamics, Plasticity & Rehabilitation, Boston University School of Medicine, Boston, Massachusetts, 02118, USA
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36
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Saj A, Pierce J, Caroli A, Ronchi R, Thomasson M, Vuilleumier P. Rightward exogenous attentional shifts impair perceptual memory of spatial locations in patients with left unilateral spatial neglect. Cortex 2020; 122:187-197. [DOI: 10.1016/j.cortex.2019.10.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Revised: 11/02/2018] [Accepted: 10/14/2019] [Indexed: 10/25/2022]
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37
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Fortis P, Ronchi R, Velardo V, Calzolari E, Banco E, Algeri L, Spada MS, Vallar G. A home-based prism adaptation training for neglect patients. Cortex 2020; 122:61-80. [DOI: 10.1016/j.cortex.2018.09.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Revised: 07/25/2018] [Accepted: 09/02/2018] [Indexed: 11/15/2022]
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38
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Lunven M, Rode G, Bourlon C, Duret C, Migliaccio R, Chevrillon E, Thiebaut de Schotten M, Bartolomeo P. Anatomical predictors of successful prism adaptation in chronic visual neglect. Cortex 2019; 120:629-641. [DOI: 10.1016/j.cortex.2018.12.004] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2018] [Revised: 09/12/2018] [Accepted: 12/01/2018] [Indexed: 11/29/2022]
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39
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Prism adaptation changes resting-state functional connectivity in the dorsal stream of visual attention networks in healthy adults: A fMRI study. Cortex 2019; 119:594-605. [DOI: 10.1016/j.cortex.2018.10.018] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2018] [Revised: 09/04/2018] [Accepted: 10/23/2018] [Indexed: 01/05/2023]
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40
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Pierce JE, Saj A, Vuilleumier P. Differential parietal activations for spatial remapping and saccadic control in a visual memory task. Neuropsychologia 2019; 131:129-138. [DOI: 10.1016/j.neuropsychologia.2019.05.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2018] [Revised: 03/13/2019] [Accepted: 05/10/2019] [Indexed: 10/26/2022]
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41
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Wiesen D, Sperber C, Yourganov G, Rorden C, Karnath HO. Using machine learning-based lesion behavior mapping to identify anatomical networks of cognitive dysfunction: Spatial neglect and attention. Neuroimage 2019; 201:116000. [PMID: 31295567 DOI: 10.1016/j.neuroimage.2019.07.013] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Revised: 07/02/2019] [Accepted: 07/04/2019] [Indexed: 12/12/2022] Open
Abstract
Previous lesion behavior studies primarily used univariate lesion behavior mapping techniques to map the anatomical basis of spatial neglect after right brain damage. These studies led to inconsistent results and lively controversies. Given these inconsistencies, the idea of a wide-spread network that might underlie spatial orientation and neglect has been pushed forward. In such case, univariate lesion behavior mapping methods might have been inherently limited in detecting the presumed network due to limited statistical power. By comparing various univariate analyses with multivariate lesion-mapping based on support vector regression, we aimed to validate the network hypothesis directly in a large sample of 203 newly recruited right brain damaged patients. If the exact same correction factors and parameter combinations (FDR correction and dTLVC for lesion size control) were used, both univariate as well as multivariate approaches uncovered the same complex network pattern underlying spatial neglect. At the cortical level, lesion location dominantly affected the temporal cortex and its borders into inferior parietal and occipital cortices. Beyond, frontal and subcortical gray matter regions as well as white matter tracts connecting these regions were affected. Our findings underline the importance of a right network in spatial exploration and attention and specifically in the emergence of the core symptoms of spatial neglect.
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Affiliation(s)
- Daniel Wiesen
- Center of Neurology, Division of Neuropsychology, Hertie-Institute for Clinical Brain Research, University of Tübingen, Tübingen, 72076, Germany
| | - Christoph Sperber
- Center of Neurology, Division of Neuropsychology, Hertie-Institute for Clinical Brain Research, University of Tübingen, Tübingen, 72076, Germany
| | - Grigori Yourganov
- Department of Psychology, University of South Carolina, Columbia, 29208, USA
| | - Christopher Rorden
- Department of Psychology, University of South Carolina, Columbia, 29208, USA
| | - Hans-Otto Karnath
- Center of Neurology, Division of Neuropsychology, Hertie-Institute for Clinical Brain Research, University of Tübingen, Tübingen, 72076, Germany; Department of Psychology, University of South Carolina, Columbia, 29208, USA.
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42
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Chokron S, Peyrin C, Perez C. Ipsilesional deficit of selective attention in left homonymous hemianopia and left unilateral spatial neglect. Neuropsychologia 2019; 128:305-314. [DOI: 10.1016/j.neuropsychologia.2018.03.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Revised: 03/06/2018] [Accepted: 03/08/2018] [Indexed: 12/23/2022]
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43
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Guggisberg AG, Koch PJ, Hummel FC, Buetefisch CM. Brain networks and their relevance for stroke rehabilitation. Clin Neurophysiol 2019; 130:1098-1124. [PMID: 31082786 DOI: 10.1016/j.clinph.2019.04.004] [Citation(s) in RCA: 102] [Impact Index Per Article: 20.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Revised: 03/04/2019] [Accepted: 04/08/2019] [Indexed: 12/21/2022]
Abstract
Stroke has long been regarded as focal disease with circumscribed damage leading to neurological deficits. However, advances in methods for assessing the human brain and in statistics have enabled new tools for the examination of the consequences of stroke on brain structure and function. Thereby, it has become evident that stroke has impact on the entire brain and its network properties and can therefore be considered as a network disease. The present review first gives an overview of current methodological opportunities and pitfalls for assessing stroke-induced changes and reorganization in the human brain. We then summarize principles of plasticity after stroke that have emerged from the assessment of networks. Thereby, it is shown that neurological deficits do not only arise from focal tissue damage but also from local and remote changes in white-matter tracts and in neural interactions among wide-spread networks. Similarly, plasticity and clinical improvements are associated with specific compensatory structural and functional patterns of neural network interactions. Innovative treatment approaches have started to target such network patterns to enhance recovery. Network assessments to predict treatment response and to individualize rehabilitation is a promising way to enhance specific treatment effects and overall outcome after stroke.
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Affiliation(s)
- Adrian G Guggisberg
- Division of Neurorehabilitation, Department of Clinical Neurosciences, University Hospital Geneva, Switzerland.
| | - Philipp J Koch
- Defitech Chair of Clinical Neuroengineering, Center for Neuroprosthetics (CNP) and Brain Mind Institute (BMI), Swiss Federal Institute of Technology (EPFL), 1202 Geneva, Switzerland; Defitech Chair of Clinical Neuroengineering, Center for Neuroprosthetics (CNP) and Brain Mind Institute (BMI), Swiss Federal Institute of Technology Valais (EPFL Valais), Clinique Romande de Réadaptation, 1951 Sion, Switzerland
| | - Friedhelm C Hummel
- Defitech Chair of Clinical Neuroengineering, Center for Neuroprosthetics (CNP) and Brain Mind Institute (BMI), Swiss Federal Institute of Technology (EPFL), 1202 Geneva, Switzerland; Defitech Chair of Clinical Neuroengineering, Center for Neuroprosthetics (CNP) and Brain Mind Institute (BMI), Swiss Federal Institute of Technology Valais (EPFL Valais), Clinique Romande de Réadaptation, 1951 Sion, Switzerland; Department of Clinical Neuroscience, University Hospital Geneva, 1202 Geneva, Switzerland
| | - Cathrin M Buetefisch
- Depts of Neurology, Rehabilitation Medicine, Radiology, Emory University, Atlanta, GA, USA
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44
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Pierce J, Saj A. A critical review of the role of impaired spatial remapping processes in spatial neglect. Clin Neuropsychol 2018; 33:948-970. [DOI: 10.1080/13854046.2018.1503722] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Jordan Pierce
- Department of Neurosciences, University of Geneva, Geneva, Switzerland
| | - Arnaud Saj
- Department of Neurosciences, University of Geneva, Geneva, Switzerland
- Department of Neurology, University Hospital of Geneva, Geneva, Switzerland
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45
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Tu MC, Lo CP, Huang CF, Huang WH, Deng JF, Hsu YH. Visual Attention Performances and Related Cerebral Microstructural Integrity Among Subjects With Subjective Cognitive Decline and Mild Cognitive Impairment. Front Aging Neurosci 2018; 10:268. [PMID: 30245626 PMCID: PMC6137332 DOI: 10.3389/fnagi.2018.00268] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Accepted: 08/21/2018] [Indexed: 01/09/2023] Open
Abstract
Objective: To compare visual attention performances and diffusion tensor imaging (DTI) between subjects with subjective cognitive decline (SCD) and mild cognitive impairment (MCI), and to discover neuronal substrates related to visual attention performances. Methods: Thirty-nine subjects with SCD and 15 with MCI, diagnosed following neuropsychological tests and conventional brain magnetic resonance imaging, were recruited. All subjects were further examined by the Conners Continuous Performance Test 3 (CPT3) and DTI including fractional anisotropy (FA) and mean diffusivity (MD), in which group comparisons and stepwise linear regression were made. Results: Subjects with MCI had a worse performance in all retrieval indices of verbal/nonverbal memory tests than those with SCD in the context of comparable general cognition and demographic status. In the CPT3, subjects with MCI had a significant longer hit reaction time (HRT) by univariate but not multivariate comparisons. Further analysis suggested that a longer HRT across all interstimuli intervals and at the point of fourth to sixth blocks were noted among MCI subjects. In DTI evaluations, FA value within the left forceps major was the only hotspot with significant between-group differences after the Bonferroni correction of FA and MD values. On the basis that HRT had significant inverse correlations with FA value within the genu of the corpus callosum and left forceps minor, regression analysis was conducted, showing HRT was best predicted by the FA value within the left forceps minor. Area under receiver operative characteristic curve was 0.70; the optimum cut-off for HRT was 515.8 ms, with a sensitivity of 85% but specificity of 47%. Conclusions: Our report suggested that impaired sustained attention and vigilance to be an early cognitive marker in differentiating MCI from SCD, where MCI subjects had a longer HRT across all interstimuli intervals and more profoundly in later blocks. FA measures appeared to be more sensitive DTI parameters than MD values in detecting microstructural changes between SCD and MCI. The role of the anterior interhemispheric fibers in sustained attention implementation during visual signal detection task was highlighted.
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Affiliation(s)
- Min-Chien Tu
- Department of Neurology, Taichung Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Taichung, Taiwan.,School of Medicine, Tzu Chi University, Hualien, Taiwan
| | - Chung-Ping Lo
- School of Medicine, Tzu Chi University, Hualien, Taiwan.,Department of Radiology, Taichung Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Taichung, Taiwan
| | - Ching-Feng Huang
- Department of Neurology, Taichung Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Taichung, Taiwan.,School of Medicine, Tzu Chi University, Hualien, Taiwan
| | - Wen-Hui Huang
- Department of Neurology, Taichung Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Taichung, Taiwan
| | - Jie Fu Deng
- Department of Neurology, Taichung Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Taichung, Taiwan
| | - Yen-Hsuan Hsu
- Department of Psychology, National Chung Cheng University, Chiayi, Taiwan.,Center for Innovative Research on Aging Society (CIRAS), National Chung Cheng University, Chiayi, Taiwan
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46
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Common brain networks for distinct deficits in visual neglect. A combined structural and tractography MRI approach. Neuropsychologia 2018; 115:167-178. [DOI: 10.1016/j.neuropsychologia.2017.10.018] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2017] [Revised: 10/15/2017] [Accepted: 10/16/2017] [Indexed: 11/20/2022]
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47
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Saj A, Verdon V, Hauert CA, Vuilleumier P. Dissociable components of spatial neglect associated with frontal and parietal lesions. Neuropsychologia 2018; 115:60-69. [DOI: 10.1016/j.neuropsychologia.2018.02.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Revised: 02/03/2018] [Accepted: 02/16/2018] [Indexed: 12/19/2022]
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48
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Efficacy of Noninvasive Brain Stimulation on Unilateral Neglect After Stroke. Am J Phys Med Rehabil 2018; 97:261-269. [DOI: 10.1097/phm.0000000000000834] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Toba MN, Rabuffetti M, Duret C, Pradat-Diehl P, Gainotti G, Bartolomeo P. Component deficits of visual neglect: “Magnetic” attraction of attention vs. impaired spatial working memory. Neuropsychologia 2018; 109:52-62. [DOI: 10.1016/j.neuropsychologia.2017.11.034] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Revised: 11/07/2017] [Accepted: 11/29/2017] [Indexed: 12/18/2022]
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Increased Alpha-Rhythm Dynamic Range Promotes Recovery from Visuospatial Neglect: A Neurofeedback Study. Neural Plast 2017; 2017:7407241. [PMID: 28529806 PMCID: PMC5424484 DOI: 10.1155/2017/7407241] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2016] [Accepted: 03/08/2017] [Indexed: 11/22/2022] Open
Abstract
Despite recent attempts to use electroencephalogram (EEG) neurofeedback (NFB) as a tool for rehabilitation of motor stroke, its potential for improving neurological impairments of attention—such as visuospatial neglect—remains underexplored. It is also unclear to what extent changes in cortical oscillations contribute to the pathophysiology of neglect, or its recovery. Utilizing EEG-NFB, we sought to causally manipulate alpha oscillations in 5 right-hemisphere stroke patients in order to explore their role in visuospatial neglect. Patients trained to reduce alpha oscillations from their right posterior parietal cortex (rPPC) for 20 minutes daily, over 6 days. Patients demonstrated successful NFB learning between training sessions, denoted by improved regulation of alpha oscillations from rPPC. We observed a significant negative correlation between visuospatial search deficits (i.e., cancellation test) and reestablishment of spontaneous alpha-rhythm dynamic range (i.e., its amplitude variability). Our findings support the use of NFB as a tool for investigating neuroplastic recovery after stroke and suggest reinstatement of intact parietal alpha oscillations as a promising target for reversing attentional deficits. Specifically, we demonstrate for the first time the feasibility of EEG-NFB in neglect patients and provide evidence that targeting alpha amplitude variability might constitute a valuable marker for clinical symptoms and self-regulation.
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