1
|
Martin del Campo Vera R, Sundaram S, Lee R, Lee Y, Leonor A, Chung RS, Shao A, Cavaleri J, Gilbert ZD, Zhang S, Kammen A, Mason X, Heck C, Liu CY, Kellis S, Lee B. Beta-band power classification of go/no-go arm-reaching responses in the human hippocampus. J Neural Eng 2024; 21:046017. [PMID: 38914073 PMCID: PMC11247508 DOI: 10.1088/1741-2552/ad5b19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Revised: 05/25/2024] [Accepted: 06/24/2024] [Indexed: 06/26/2024]
Abstract
Objective.Can we classify movement execution and inhibition from hippocampal oscillations during arm-reaching tasks? Traditionally associated with memory encoding, spatial navigation, and motor sequence consolidation, the hippocampus has come under scrutiny for its potential role in movement processing. Stereotactic electroencephalography (SEEG) has provided a unique opportunity to study the neurophysiology of the human hippocampus during motor tasks. In this study, we assess the accuracy of discriminant functions, in combination with principal component analysis (PCA), in classifying between 'Go' and 'No-go' trials in a Go/No-go arm-reaching task.Approach.Our approach centers on capturing the modulation of beta-band (13-30 Hz) power from multiple SEEG contacts in the hippocampus and minimizing the dimensional complexity of channels and frequency bins. This study utilizes SEEG data from the human hippocampus of 10 participants diagnosed with epilepsy. Spectral power was computed during a 'center-out' Go/No-go arm-reaching task, where participants reached or withheld their hand based on a colored cue. PCA was used to reduce data dimension and isolate the highest-variance components within the beta band. The Silhouette score was employed to measure the quality of clustering between 'Go' and 'No-go' trials. The accuracy of five different discriminant functions was evaluated using cross-validation.Main results.The Diagonal-Quadratic model performed best of the 5 classification models, exhibiting the lowest error rate in all participants (median: 9.91%, average: 14.67%). PCA showed that the first two principal components collectively accounted for 54.83% of the total variance explained on average across all participants, ranging from 36.92% to 81.25% among participants.Significance.This study shows that PCA paired with a Diagonal-Quadratic model can be an effective method for classifying between Go/No-go trials from beta-band power in the hippocampus during arm-reaching responses. This emphasizes the significance of hippocampal beta-power modulation in motor control, unveiling its potential implications for brain-computer interface applications.
Collapse
Affiliation(s)
- Roberto Martin del Campo Vera
- Department of Neurological Surgery, Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, United States of America
| | - Shivani Sundaram
- Department of Neurological Surgery, Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, United States of America
| | - Richard Lee
- Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, United States of America
| | - Yelim Lee
- Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, United States of America
| | - Andrea Leonor
- Department of Neurological Surgery, Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, United States of America
| | - Ryan S Chung
- Department of Neurological Surgery, Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, United States of America
| | - Arthur Shao
- Department of Neurological Surgery, Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, United States of America
| | - Jonathon Cavaleri
- Department of Neurological Surgery, Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, United States of America
| | - Zachary D Gilbert
- Department of Neurological Surgery, Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, United States of America
| | - Selena Zhang
- Viterbi School of Engineering, University of Southern California, Los Angeles, CA, United States of America
| | - Alexandra Kammen
- Department of Neurological Surgery, Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, United States of America
| | - Xenos Mason
- Department of Neurological Surgery, Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, United States of America
- USC Neurorestoration Center, Keck School of Medicine of USC, Los Angeles, CA, United States of America
- Department of Neurology, Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, United States of America
- Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, United States of America
| | - Christi Heck
- USC Neurorestoration Center, Keck School of Medicine of USC, Los Angeles, CA, United States of America
- Department of Neurology, Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, United States of America
- Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, United States of America
| | - Charles Y Liu
- Department of Neurological Surgery, Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, United States of America
- USC Neurorestoration Center, Keck School of Medicine of USC, Los Angeles, CA, United States of America
- Department of Neurology, Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, United States of America
- Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, United States of America
- Viterbi School of Engineering, University of Southern California, Los Angeles, CA, United States of America
| | - Spencer Kellis
- Department of Neurological Surgery, Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, United States of America
- USC Neurorestoration Center, Keck School of Medicine of USC, Los Angeles, CA, United States of America
- Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, United States of America
| | - Brian Lee
- Department of Neurological Surgery, Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, United States of America
- USC Neurorestoration Center, Keck School of Medicine of USC, Los Angeles, CA, United States of America
- Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, United States of America
- Viterbi School of Engineering, University of Southern California, Los Angeles, CA, United States of America
| |
Collapse
|
2
|
Agyeman K, McCarty T, Multani H, Mattingly K, Koziar K, Chu J, Liu C, Kokkoni E, Christopoulos V. Task-based functional neuroimaging in infants: a systematic review. Front Neurosci 2023; 17:1233990. [PMID: 37655006 PMCID: PMC10466897 DOI: 10.3389/fnins.2023.1233990] [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: 06/03/2023] [Accepted: 07/17/2023] [Indexed: 09/02/2023] Open
Abstract
Background Infancy is characterized by rapid neurological transformations leading to consolidation of lifelong function capabilities. Studying the infant brain is crucial for understanding how these mechanisms develop during this sensitive period. We review the neuroimaging modalities used with infants in stimulus-induced activity paradigms specifically, for the unique opportunity the latter provide for assessment of brain function. Methods Conducted a systematic review of literature published between 1977-2021, via a comprehensive search of four major databases. Standardized appraisal tools and inclusion/exclusion criteria were set according to the PRISMA guidelines. Results Two-hundred and thirteen papers met the criteria of the review process. The results show clear evidence of overall cumulative growth in the number of infant functional neuroimaging studies, with electroencephalography (EEG) and functional near-infrared spectroscopy (fNIRS) to be the most utilized and fastest growing modalities with behaving infants. However, there is a high level of exclusion rates associated with technical limitations, leading to limited motor control studies (about 6 % ) in this population. Conclusion Although the use of functional neuroimaging modalities with infants increases, there are impediments to effective adoption of existing technologies with this population. Developing new imaging modalities and experimental designs to monitor brain activity in awake and behaving infants is vital.
Collapse
Affiliation(s)
- Kofi Agyeman
- Department of Bioengineering, University of California, Riverside, Riverside, CA, United States
| | - Tristan McCarty
- Department of Bioengineering, University of California, Riverside, Riverside, CA, United States
| | - Harpreet Multani
- Department of Bioengineering, University of California, Riverside, Riverside, CA, United States
| | - Kamryn Mattingly
- Neuroscience Graduate Program, University of California, Riverside, Riverside, CA, United States
| | - Katherine Koziar
- Orbach Science Library, University of California, Riverside, Riverside, CA, United States
| | - Jason Chu
- Division of Neurosurgery, Children’s Hospital Los Angeles, Los Angeles, CA, United States
- Department of Neurological Surgery, University of Southern California, Los Angeles, CA, United States
| | - Charles Liu
- USC Neurorestoration Center, University of Southern California, Los Angeles, CA, United States
- Department of Neurological Surgery, University of Southern California, Los Angeles, CA, United States
| | - Elena Kokkoni
- Department of Bioengineering, University of California, Riverside, Riverside, CA, United States
| | - Vassilios Christopoulos
- Department of Bioengineering, University of California, Riverside, Riverside, CA, United States
- Neuroscience Graduate Program, University of California, Riverside, Riverside, CA, United States
- Department of Neurological Surgery, University of Southern California, Los Angeles, CA, United States
| |
Collapse
|
3
|
Liu X, Cheng F, Hu S, Wang B, Hu C, Zhu Z, Zhuang W, Mei X, Li X, Zhou Q, Zhang W, Tang Y, Zhou D. Cortical activation and functional connectivity during the verbal fluency task for adolescent-onset depression: A multi-channel NIRS study. J Psychiatr Res 2022; 147:254-261. [PMID: 35074741 DOI: 10.1016/j.jpsychires.2022.01.040] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 12/08/2021] [Accepted: 01/13/2022] [Indexed: 12/11/2022]
Abstract
OBJECTIVE Depression disorder is accompanied by cognitive impairments. However, there is limited research focused on cognitive impairments and their neurological mechanism in adolescents with depression. The purpose of the current study is to illustrate the differences in brain activity patterns between depressed adolescents and healthy controls (HCs). METHOD A total of 72 adolescents with depression, as well as 74 HCs, were recruited. We utilized functional near-infrared spectroscopy (fNIRS) to monitor the concentrations of oxyhemoglobin (Oxy-Hb) in the brains of participants while they performed the verbal fluency task (VFT) to examine cognitive impairment in adolescents with depression. RESULTS Our study demonstrated that adolescents with depression had significantly less cortical activation in the hemodynamic responses of Oxy-Hb at channels mainly located in the prefrontal cortex (PFC) than HCs during the 60-s task period (false discovery rate (FDR)-corrected p < 0.05). The mean channel-to-channel connectivity was 0.400 for HCs (SD = 0.149) and 0.303 (SD = 0.138) for adolescents with depression, and the HC group had a higher mean channel-to-channel connectivity strength than the depression group (t = -15.586, p < 0.001). For the patient group, we found significant negative correlations between HAMD scores and mean Oxy-Hb changes in Channel 38 (r = -0.33, p < 0.01), Channel 39 (r = -0.34, p < 0.01), Channel 41 (r = -0.25, p < 0.05), Channel 42 (r = -0.28, p < 0.05), and Channel 44 (r = -0.27, p < 0.05), and these channels were mainly located in areas with little difference between groups. CONCLUSIONS Our study provides neurological evidence about the executive function (EF) in depressed adolescents. Adolescents with depression exhibited an abnormal activation pattern and decreased task-related functional connectivity compared to HCs. The changed Oxy-Hb concentration of PFC during VFT was not sensitive to depression symptoms.
Collapse
Affiliation(s)
- Xiaoli Liu
- Ningbo Kangning Hospital, Ningbo Key Laboratory of Sleep Medicine, Affiliated Tongyi Hospital of Medical College of Ningbo University, Ningbo, Zhejiang, China
| | - Fang Cheng
- Ningbo Kangning Hospital, Ningbo Key Laboratory of Sleep Medicine, Affiliated Tongyi Hospital of Medical College of Ningbo University, Ningbo, Zhejiang, China
| | - Shasha Hu
- Ningbo Kangning Hospital, Ningbo Key Laboratory of Sleep Medicine, Affiliated Tongyi Hospital of Medical College of Ningbo University, Ningbo, Zhejiang, China
| | - Beini Wang
- Ningbo Kangning Hospital, Ningbo Key Laboratory of Sleep Medicine, Affiliated Tongyi Hospital of Medical College of Ningbo University, Ningbo, Zhejiang, China
| | - Changzhou Hu
- Ningbo Kangning Hospital, Ningbo Key Laboratory of Sleep Medicine, Affiliated Tongyi Hospital of Medical College of Ningbo University, Ningbo, Zhejiang, China
| | - Zhenzhen Zhu
- Ningbo Kangning Hospital, Ningbo Key Laboratory of Sleep Medicine, Affiliated Tongyi Hospital of Medical College of Ningbo University, Ningbo, Zhejiang, China
| | - Wenhao Zhuang
- Ningbo Kangning Hospital, Ningbo Key Laboratory of Sleep Medicine, Affiliated Tongyi Hospital of Medical College of Ningbo University, Ningbo, Zhejiang, China
| | - Xi Mei
- Ningbo Kangning Hospital, Ningbo Key Laboratory of Sleep Medicine, Affiliated Tongyi Hospital of Medical College of Ningbo University, Ningbo, Zhejiang, China
| | - Xingxing Li
- Ningbo Kangning Hospital, Ningbo Key Laboratory of Sleep Medicine, Affiliated Tongyi Hospital of Medical College of Ningbo University, Ningbo, Zhejiang, China
| | - Qi Zhou
- Ningbo Kangning Hospital, Ningbo Key Laboratory of Sleep Medicine, Affiliated Tongyi Hospital of Medical College of Ningbo University, Ningbo, Zhejiang, China
| | - Wenwu Zhang
- Ningbo Kangning Hospital, Ningbo Key Laboratory of Sleep Medicine, Affiliated Tongyi Hospital of Medical College of Ningbo University, Ningbo, Zhejiang, China.
| | - Yiping Tang
- Taizhou Second People's Hospital, Taizhou, Zhejiang, 317200, China.
| | - Dongsheng Zhou
- Ningbo Kangning Hospital, Ningbo Key Laboratory of Sleep Medicine, Affiliated Tongyi Hospital of Medical College of Ningbo University, Ningbo, Zhejiang, China.
| |
Collapse
|
4
|
Ren E, Zhang C, Li D, Pang X, Liu G. Leveraging metal oxide nanoparticles for bacteria tracing and eradicating. VIEW 2020. [DOI: 10.1002/viw.20200052] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Affiliation(s)
- En Ren
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics & Center for Molecular Imaging and Translational Medicine School of Public Health Xiamen University Xiamen China
| | - Chang Zhang
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics & Center for Molecular Imaging and Translational Medicine School of Public Health Xiamen University Xiamen China
| | - Dengfeng Li
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics & Center for Molecular Imaging and Translational Medicine School of Public Health Xiamen University Xiamen China
| | - Xin Pang
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics & Center for Molecular Imaging and Translational Medicine School of Public Health Xiamen University Xiamen China
- Department of Magnetic Resonance Imaging The First Affiliated Hospital of Zhengzhou University Zhengzhou China
| | - Gang Liu
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics & Center for Molecular Imaging and Translational Medicine School of Public Health Xiamen University Xiamen China
| |
Collapse
|
5
|
Gokcay D, Eken A, Baltaci S. Binary Classification Using Neural and Clinical Features: An Application in Fibromyalgia With Likelihood-Based Decision Level Fusion. IEEE J Biomed Health Inform 2019; 23:1490-1498. [DOI: 10.1109/jbhi.2018.2844300] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
6
|
Abstract
Current conceptions on the fundamental mechanisms underlying brain functioning in normal conditions and pathological states are considered. The author emphasizes that a great progress in the field has been achieved after the implementation of neuroimaging methods in clinical practice. During the last time, attention is drawn to the connections between separate neurons as well as between different brain regions. Functional specialization and functional integration of different brain regions are key concepts of the higher brain function organization. The significance of the resting state of the brain, which is in fact the active process, is analyzed. The state of cerebral functions determines internal processes in the neuronal tissue. Different aspects of energy metabolism determining the normal functioning of cerebral structures are considered. The expediency of using the drugs influencing the energy metabolism, one of which is 2-ethyl-6-methyl-3-hydroxypyridine succinate (mexidol), is highlighted.
Collapse
Affiliation(s)
- I V Damulin
- I.M. Sechenov First Moscow State Medical University, Moscow, Russia
| |
Collapse
|
7
|
Althammer F, Jirikowski G, Grinevich V. The oxytocin system of mice and men-Similarities and discrepancies of oxytocinergic modulation in rodents and primates. Peptides 2018; 109:1-8. [PMID: 30261208 DOI: 10.1016/j.peptides.2018.09.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Revised: 09/18/2018] [Accepted: 09/18/2018] [Indexed: 01/21/2023]
Abstract
Nonapeptides and their respective receptors have been conserved throughout evolution and display astonishing similarities among the animal kingdom. They can be found in worms, birds, fish, amphibians, reptiles and mammals, including rodents, non-human primates and humans. In particular, the neuropeptide oxytocin (OT) has attracted the attention of scientists due to its profound effects on social behavior. However, although both the neuropeptide and its receptor are identical in rodents and primates, the effects of OT vary greatly in the two species. Here, we provide a brief overview about OT's role in the evolution of mammals and provide reasons for the manifold effects of OT within the brain with a particular focus on the discrepancy of OT's effects in rodents and primates. In addition, we suggest new approaches towards improvement of translatability of scientific studies and highlight the most recent advances in animal models for autism spectrum disorder, a disease, in which the normal function of the OT system seems to be impaired.
Collapse
Affiliation(s)
- Ferdinand Althammer
- Schaller Research Group on Neuropeptides at German Cancer Research Center (DKFZ) and Cell Network Cluster of Excellence at the University of Heidelberg, Heidelberg, Germany.
| | | | - Valery Grinevich
- Schaller Research Group on Neuropeptides at German Cancer Research Center (DKFZ) and Cell Network Cluster of Excellence at the University of Heidelberg, Heidelberg, Germany; Central Institute of Mental Health (ZI), Mannheim, Germany
| |
Collapse
|
8
|
Mandal PK, Banerjee A, Tripathi M, Sharma A. A Comprehensive Review of Magnetoencephalography (MEG) Studies for Brain Functionality in Healthy Aging and Alzheimer's Disease (AD). Front Comput Neurosci 2018; 12:60. [PMID: 30190674 PMCID: PMC6115612 DOI: 10.3389/fncom.2018.00060] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2018] [Accepted: 07/09/2018] [Indexed: 12/16/2022] Open
Abstract
Neural oscillations were established with their association with neurophysiological activities and the altered rhythmic patterns are believed to be linked directly to the progression of cognitive decline. Magnetoencephalography (MEG) is a non-invasive technique to record such neuronal activity due to excellent temporal and fair amount of spatial resolution. Single channel, connectivity as well as brain network analysis using MEG data in resting state and task-based experiments were analyzed from existing literature. Single channel analysis studies reported a less complex, more regular and predictable oscillations in Alzheimer's disease (AD) primarily in the left parietal, temporal and occipital regions. Investigations on both functional connectivity (FC) and effective (EC) connectivity analysis demonstrated a loss of connectivity in AD compared to healthy control (HC) subjects found in higher frequency bands. It has been reported from multiplex network of MEG study in AD in the affected regions of hippocampus, posterior default mode network (DMN) and occipital areas, however, conclusions cannot be drawn due to limited availability of clinical literature. Potential utilization of high spatial resolution in MEG likely to provide information related to in-depth brain functioning and underlying factors responsible for changes in neuronal waves in AD. This review is a comprehensive report to investigate diagnostic biomarkers for AD may be identified by from MEG data. It is also important to note that MEG data can also be utilized for the same pursuit in combination with other imaging modalities.
Collapse
Affiliation(s)
- Pravat K. Mandal
- Neuroimaging and Neurospectroscopy Lab, National Brain Research Centre, Gurgaon, India
- Department of Neurodegeneration, Florey Institute of Neuroscience and Mental Health, Melbourne, VIC, Australia
| | - Anwesha Banerjee
- Neuroimaging and Neurospectroscopy Lab, National Brain Research Centre, Gurgaon, India
| | - Manjari Tripathi
- Department of Neurology, All Indian Institute of Medical Sciences, New Delhi, India
| | - Ankita Sharma
- Neuroimaging and Neurospectroscopy Lab, National Brain Research Centre, Gurgaon, India
| |
Collapse
|
9
|
Chamard E, Lichtenstein JD. A systematic review of neuroimaging findings in children and adolescents with sports-related concussion. Brain Inj 2018; 32:816-831. [PMID: 29648462 DOI: 10.1080/02699052.2018.1463106] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
BACKGROUND Sport-related concussion (SRC) generally does not result in structural anomalies revealed through clinical imaging techniques such as MRI and CT. While advanced neuroimaging techniques offer another avenue to investigate the subtle alterations following SRC, the current pediatric literature in this area has yet to be reviewed. The aim of this review is to systematically explore the literature on magnetic resonance spectroscopy (MRS), diffusion tensor imaging (DTI), functional magnetic resonance imaging (fMRI), and cortical thickness following SRC in children and adolescents. METHODS A systematic Pubmed search using the preferred reporting items for systematic reviews and meta-analysis guidelines was conducted independently for each neuroimaging method. Studies were screened for inclusion based on pre-determined criteria. RESULTS A total of 26 studies were included (MRS = 4, DTI = 10, fMRI = 11, cortical thickness = 1). A total of 16 studies were conducted solely with male athletes, while 10 studies recruited an unequal number of male and female athletes. CONCLUSIONS While MRI and CT are generally unrevealing, advanced neuroimaging techniques demonstrated neurometabolic, microstructural, and functional alterations following SRC in athletes younger than 19 years of age in the acute, subacute, and chronic phases of recovery. However, more studies are needed to fully understand the impact of SRC on the developing brain in children and adolescents.
Collapse
Affiliation(s)
- Emilie Chamard
- a Department of Psychiatry, Geisel School of Medicine at Dartmouth , Dartmouth-Hitchcock Medical Center , Lebanon , NH , USA
| | - Jonathan D Lichtenstein
- a Department of Psychiatry, Geisel School of Medicine at Dartmouth , Dartmouth-Hitchcock Medical Center , Lebanon , NH , USA
| |
Collapse
|
10
|
Engels MMA, van der Flier WM, Stam CJ, Hillebrand A, Scheltens P, van Straaten ECW. Alzheimer's disease: The state of the art in resting-state magnetoencephalography. Clin Neurophysiol 2017. [PMID: 28622527 DOI: 10.1016/j.clinph.2017.05.012] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Alzheimer's disease (AD) is accompanied by functional brain changes that can be detected in imaging studies, including electromagnetic activity recorded with magnetoencephalography (MEG). Here, we systematically review the studies that have examined resting-state MEG changes in AD and identify areas that lack scientific or clinical progress. Three levels of MEG analysis will be covered: (i) single-channel signal analysis, (ii) pairwise analyses over time series, which includes the study of interdependencies between two time series and (iii) global network analyses. We discuss the findings in the light of other functional modalities, such as electroencephalography (EEG) and functional magnetic resonance imaging (fMRI). Overall, single-channel MEG results show consistent changes in AD that are in line with EEG studies, but the full potential of the high spatial resolution of MEG and advanced functional connectivity and network analysis has yet to be fully exploited. Adding these features to the current knowledge will potentially aid in uncovering organizational patterns of brain function in AD and thereby aid the understanding of neuronal mechanisms leading to cognitive deficits.
Collapse
Affiliation(s)
- M M A Engels
- Alzheimer Centrum and Department of Neurology, Neuroscience Campus Amsterdam, VU University Medical Center, Amsterdam, The Netherlands.
| | - W M van der Flier
- Alzheimer Centrum and Department of Neurology, Neuroscience Campus Amsterdam, VU University Medical Center, Amsterdam, The Netherlands; Department of Epidemiology and Biostatistics, Neuroscience Campus Amsterdam, VU University Medical Center, Amsterdam, The Netherlands
| | - C J Stam
- Department of Clinical Neurophysiology and MEG Center, VU University Medical Center, Amsterdam, The Netherlands
| | - A Hillebrand
- Department of Clinical Neurophysiology and MEG Center, VU University Medical Center, Amsterdam, The Netherlands
| | - Ph Scheltens
- Alzheimer Centrum and Department of Neurology, Neuroscience Campus Amsterdam, VU University Medical Center, Amsterdam, The Netherlands
| | - E C W van Straaten
- Department of Clinical Neurophysiology and MEG Center, VU University Medical Center, Amsterdam, The Netherlands
| |
Collapse
|
11
|
Min H, Xu F, Gu R, Han X, Wang A, Liu K. Potential diagnostic role of diffusion tensor imaging in early-stage osteonecrosis of the femoral head. Exp Ther Med 2016; 12:3347-3352. [PMID: 27882161 DOI: 10.3892/etm.2016.3787] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Accepted: 04/08/2016] [Indexed: 11/05/2022] Open
Abstract
The present study aimed to explore the potential diagnostic role of diffusion tensor magnetic resonance imaging (DTI) in the early stage of modified corticosteroid-induced osteonecrosis of the femoral head (ONFH). A total of 20 beagles were randomly classified (1:1) into either an experimental group (LM), which were intramuscularly injected with lipopolysaccharide (LPS) and methylprednisolone (MPS) on three consecutive days, or control (CON) group, which were injected with saline. Magnetic resonance imaging (MRI) and DTI were performed at pre-induction and 8 and 12 weeks post-induction. Apparent diffusion coefficient (ADC) values in the range of interest in the femoral head were quantified using DTI. Proximal femora were examined for ONFH at 8 and 12 weeks. The results demonstrated that ONFH developed in four beagles at 8 weeks and in six beagles at 12 weeks, whereas no ONFH was detected in the CON group. No abnormalities were detected by MRI and DTI, and no mortality occurred. In beagles with ONFH in the LM group, the ADC values were 4.7±0.2×10-4 and 4.8±0.3×10-4 mm2/sec at 8 and 12 weeks, respectively, which were significantly increased compared with the CON group (2.5±0.3×10-4 and 2.4±0.3×10-4 mm2, respectively) and the LM group without ONFH (2.6±0.4×10-4 and 2.4±0.3×10-4 mm2, respectively) (P<0.05). The results of the present study indicated that intramuscular injection of LPS and MPS may lead to early-stage ONFH in beagles. As such, the detection of locally elevated ADC values in the femoral head may aid in the early diagnosis of ONFH.
Collapse
Affiliation(s)
- Hongwei Min
- Department of Rehabilitation, Capital Medical University, Beijing 100068, P.R. China; Department of Orthopedics and Rehabilitation, China Rehabilitation Research Center, Beijing Bo'ai Hospital, Beijing 100068, P.R. China
| | - Feng Xu
- Department of Rehabilitation, Capital Medical University, Beijing 100068, P.R. China; Department of Orthopedics and Rehabilitation, China Rehabilitation Research Center, Beijing Bo'ai Hospital, Beijing 100068, P.R. China
| | - Rui Gu
- Department of Rehabilitation, Capital Medical University, Beijing 100068, P.R. China; Department of Orthopedics and Rehabilitation, China Rehabilitation Research Center, Beijing Bo'ai Hospital, Beijing 100068, P.R. China
| | - Xinzuo Han
- Department of Rehabilitation, Capital Medical University, Beijing 100068, P.R. China; Department of Orthopedics and Rehabilitation, China Rehabilitation Research Center, Beijing Bo'ai Hospital, Beijing 100068, P.R. China
| | - Anqing Wang
- Department of Rehabilitation, Capital Medical University, Beijing 100068, P.R. China; Department of Orthopedics and Rehabilitation, China Rehabilitation Research Center, Beijing Bo'ai Hospital, Beijing 100068, P.R. China
| | - Kemin Liu
- Department of Rehabilitation, Capital Medical University, Beijing 100068, P.R. China; Department of Orthopedics and Rehabilitation, China Rehabilitation Research Center, Beijing Bo'ai Hospital, Beijing 100068, P.R. China
| |
Collapse
|
12
|
|
13
|
Pievani M, de Haan W, Wu T, Seeley WW, Frisoni GB. Functional network disruption in the degenerative dementias. Lancet Neurol 2011; 10:829-43. [PMID: 21778116 PMCID: PMC3219874 DOI: 10.1016/s1474-4422(11)70158-2] [Citation(s) in RCA: 335] [Impact Index Per Article: 25.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Despite advances towards understanding the molecular pathophysiology of the neurodegenerative dementias, the mechanisms linking molecular changes to neuropathology and neuropathological changes to clinical symptoms remain largely obscure. Connectivity is a distinctive feature of the brain and the integrity of functional network dynamics is crucial for normal functioning. A better understanding of network disruption in the neurodegenerative dementias might help bridge the gap between molecular changes, pathological changes, and symptoms. Recent findings on functional network disruption as assessed with resting-state or intrinsic connectivity functional MRI and electroencephalography and magnetoencephalography have shown distinct patterns of network disruption across the major neurodegenerative diseases. These network abnormalities are somewhat specific to the clinical syndromes and, in Alzheimer's disease and frontotemporal dementia, network disruption tracks the pattern of pathological changes. These findings might have practical implications for diagnostic accuracy, allowing earlier detection of neurodegenerative diseases even at the presymptomatic stage, and tracking of disease progression.
Collapse
Affiliation(s)
- Michela Pievani
- Laboratory of Epidemiology, Neuroimaging, and Telemedicine, IRCCS Centro San Giovanni di Dio, Fatebenefratelli, Brescia, Italy
| | | | | | | | | |
Collapse
|
14
|
Wang MN, Song ZJ. Classification and Analysis of the Errors in Neuronavigation. Neurosurgery 2011; 68:1131-43; discussion 1143. [DOI: 10.1227/neu.0b013e318209cc45] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Abstract
There are many different types of errors in neuronavigation, and the reasons and results of these errors are complex. For a neurosurgeon using the neuronavigation system, it is important to have a clear understanding of when an error may occur, what the magnitude of it is, and how to avoid it or reduce its influence on the final application accuracy. In this article, we classify all the errors into 2 groups according to the working principle of neuronavigation systems. The first group contains the errors caused by the differences between the anatomic structures in the images and that of the real patient, and the second group contains the errors occurring in transforming the position of surgical tools from the patient space to the image space. Each group is further divided into 2 subgroups. We discuss 16 types of errors and classify each of them into one of the subgroups. The classification and analysis of these errors should help neurosurgeons understand the power and limits of neuronavigation systems and use them more properly.
Collapse
Affiliation(s)
- Man Ning Wang
- Digital Medical Research Center, Shanghai Medical School, Fudan University, and Shanghai Key Lab of Medical Image Computing and Computer Assisted Intervention, Shanghai, China
| | - Zhi Jian Song
- Digital Medical Research Center, Shanghai Medical School, Fudan University, and Shanghai Key Lab of Medical Image Computing and Computer Assisted Intervention, Shanghai, China
| |
Collapse
|
15
|
Gosselin N, Saluja RS, Chen JK, Bottari C, Johnston K, Ptito A. Brain functions after sports-related concussion: insights from event-related potentials and functional MRI. PHYSICIAN SPORTSMED 2010; 38:27-37. [PMID: 20959693 DOI: 10.3810/psm.2010.10.1805] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The high incidence of concussions in contact sports and their impact on brain functions are a major cause for concern. To improve our understanding of brain functioning after sports-related concussion, advanced functional assessment techniques, namely event-related potentials (ERPs) and functional magnetic resonance imaging (fMRI), have been recently used in research studies. Contrary to neuropsychological tests that measure verbal and/or motor responses, ERPs and fMRI assess the neural activities associated with cognitive/behavioral demands, and thus provide access to better comprehension of brain functioning. In fact, ERPs have excellent temporal resolution, and fMRI identifies the involved structures during a task. This article describes ERP and fMRI techniques and reviews the results obtained with these tools in sports-related concussion. Although these techniques are not yet readily available, they offer a unique clinical approach, particularly for complex cases (ie, athletes with multiple concussions, chronic symptoms) and objective measures that provide valuable information to guide management and return-to-play decision making.
Collapse
Affiliation(s)
- Nadia Gosselin
- Cognitive Neuroscience Unit, Montreal Neurological Institute, Montreal, Quebec, Canada
| | | | | | | | | | | |
Collapse
|
16
|
Fine mapping the spatial distribution and concentration of unlabeled drugs within tissue micro-compartments using imaging mass spectrometry. PLoS One 2010; 5:e11411. [PMID: 20644728 PMCID: PMC2904372 DOI: 10.1371/journal.pone.0011411] [Citation(s) in RCA: 175] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2010] [Accepted: 06/12/2010] [Indexed: 12/03/2022] Open
Abstract
Readouts that define the physiological distributions of drugs in tissues are an unmet challenge and at best imprecise, but are needed in order to understand both the pharmacokinetic and pharmacodynamic properties associated with efficacy. Here we demonstrate that it is feasible to follow the in vivo transport of unlabeled drugs within specific organ and tissue compartments on a platform that applies MALDI imaging mass spectrometry to tissue sections characterized with high definition histology. We have tracked and quantified the distribution of an inhaled reference compound, tiotropium, within the lungs of dosed rats, using systematic point by point MS and MS/MS sampling at 200 µm intervals. By comparing drug ion distribution patterns in adjacent tissue sections, we observed that within 15 min following exposure, tiotropium parent MS ions (mass-to-charge; m/z 392.1) and fragmented daughter MS/MS ions (m/z 170.1 and 152.1) were dispersed in a concentration gradient (80 fmol-5 pmol) away from the central airways into the lung parenchyma and pleura. These drug levels agreed well with amounts detected in lung compartments by chemical extraction. Moreover, the simultaneous global definition of molecular ion signatures localized within 2-D tissue space provides accurate assignment of ion identities within histological landmarks, providing context to dynamic biological processes occurring at sites of drug presence. Our results highlight an important emerging technology allowing specific high resolution identification of unlabeled drugs at sites of in vivo uptake and retention.
Collapse
|
17
|
Rocca MA, Absinta M, Moiola L, Ghezzi A, Colombo B, Martinelli V, Comi G, Filippi M. Functional and Structural Connectivity of the Motor Network in Pediatric and Adult-Onset Relapsing-Remitting Multiple Sclerosis. Radiology 2010; 254:541-50. [PMID: 20093525 DOI: 10.1148/radiol.09090463] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Maria A Rocca
- Neuroimaging Research Unit, Institute of Experimental Neurology, Department of Neurology, University Hospital San Raffaele, Via Olgettina 60, 20132 Milan, Italy
| | | | | | | | | | | | | | | |
Collapse
|
18
|
Abstract
PURPOSE OF REVIEW The intent of this study is to review trends in multicenter neuroimaging trials and their value for research and implications for clinical treatment. RECENT FINDINGS The rise in availability of MRI for detecting disorders in the living brain has made it an attractive technology for assessing neural structure and function in a number of prominent diseases. Geographic factors underlying diseased populations coupled with complementary neuroimaging research programs have led to an increase in multicenter neuroimaging trials and consortia. Neuroimaging has become a major focus for multiinstitutional research in progressive changes in brain architecture, proxy biomarkers of treatment response, and the effects of disease on patterns of cognitive activation and connectivity. Notable consortia and research trial studies have focused on Alzheimer's disease, pediatric brain cancer, and fetal alcohol syndrome, in addition to multiinstitutional collaborative programs for mapping the normal brain. Such large-scale efforts necessitate close coordination of image data collection protocols, ontology development, computational requirements, concerted data archiving, and sharing. SUMMARY Multicenter neuroimaging trials, consortia, and collaboratives enable the acquisition of large-scale, purpose-driven datasets that can then be used by the broader community to model and predict clinical outcomes as well as guide clinicians in selecting treatment options for neurological disease.
Collapse
|
19
|
Shapiro MG, Szablowski JO, Langer R, Jasanoff A. Protein nanoparticles engineered to sense kinase activity in MRI. J Am Chem Soc 2009; 131:2484-6. [PMID: 19199639 DOI: 10.1021/ja8086938] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We introduce a family of protein nanoparticles capable of sensing analytes in conjunction with magnetic resonance imaging (MRI). The new sensors are derived from the iron storage protein ferritin (Ft); they are designed and optimized using facile protein engineering methods, and self-assembled in cells harboring specific combinations of DNA coding sequences. As illustration, we show that suitably constructed Ft-based sensors can report activity of the important neural signaling enzyme protein kinase A (PKA). Phosphorylation of the engineered Ft-based nanoparticles by PKA promotes clustering and changes in T(2)-weighted MRI signal.
Collapse
Affiliation(s)
- Mikhail G Shapiro
- Department of Biological Engineering, Massachusetts Institute of Technology, 150 Albany Street, NW14-2213, Cambridge, Massachusetts 02139, USA
| | | | | | | |
Collapse
|
20
|
Gispen-de Wied CC, Kritsidima M, Elferink AJA. The validity of biomarkers as surrogate endpoints in Alzheimer's disease by means of the Quantitative Surrogate Validation Level of Evidence Scheme (QSVLES). J Nutr Health Aging 2009; 13:376-87. [PMID: 19300886 DOI: 10.1007/s12603-009-0049-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
OBJECTIVE To evaluate the validity of biomarkers that are currently being proposed as potential surrogate endpoints in AD clinical trials with the aid of the "Quantitative Surrogate Validation Level of Evidence Schema" (QSVLES) proposed by Lassere et.al. (1). PROCEDURE A Pubmed literature search was conducted to identify AD biomarkers with SEP potential, and the QSVLES was applied to determine the extent of the SEP validity. RESULTS MRI, PET and MRS measures attained a total validity score of 4, NAA/Cre a total score of 5, and cerebral blood flow (SPECT), Abeta , Tau and APP a total score of 2. None of these biomarkers could fall into the rank of Levels 1 or 2, reserved for SEPs, according to the QSVLES criteria. This was mainly attributed to the lack of sufficient evidence that was derived from high ranking studies (RCT, prospective observational studies). CONCLUSION Though residing on SEPs as sole determinants of the benefit/risk ratio of AD medications seems to be pretty far, there could be certain cases where the use of SEPs may be beneficial, making efficient therapies available faster when there is a major public health interest involved. However, the potential risks of relying on invalid SEPs should not be underestimated and therefore the research on SEP validation and the development of specific validation guidance should be encouraged. The QSVLES, though not devoid of criticism, may be proposed as a starting point.
Collapse
|
21
|
Secko DM, Burgess M, O'Doherty K. Perspectives on engaging the public in the ethics of emerging biotechnologies: from salmon to biobanks to neuroethics. Account Res 2009; 15:283-302. [PMID: 18972267 DOI: 10.1080/08989620802388762] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
In anticipation of increasing interest in public engagement, this article seeks to expand the current discussion in the neuroethics literature concerning what public engagement on issues related to neuroscience might entail and how they could be envisioned. It notes that the small amount of available neuroethics literature related to public engagement has principally discussed only communication/education or made calls for dialogue without exploring what this might entail on a practical level. The article links across three seemingly disparate examples-salmon, biobanks, and neuroethics-to consider and clarify the need for public engagement in neuroscience.
Collapse
Affiliation(s)
- David M Secko
- Department of Journalism, Concordia University, Montreal, Quebec, Canada.
| | | | | |
Collapse
|
22
|
Lee AG, Johnson MC, Policeni BA, Smoker WRK. Imaging for neuro-ophthalmic and orbital disease - a review. Clin Exp Ophthalmol 2008; 37:30-53. [PMID: 19016810 DOI: 10.1111/j.1442-9071.2008.01822.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
A literature review was performed by content experts in neuro-ophthalmology and neuroradiology using a systematic English-language Medline search (1994-2008) limited to articles with relevance to neuro-ophthalmic and orbital imaging. The information covered in this review includes: (i) the basic mechanics, indications and contraindications for cranial and orbital computed tomography and magnetic resonance (MR) imaging; (ii) the utility and indications for intravenous contrast, (iii) the use of specific MR sequences; (iv) the techniques and ophthalmic indications for computed tomography/MR angiography and venography; and (v) the techniques and indications for functional MR imaging, positron emission tomography scanning and single photon emission computed tomography. Throughout the review accurate and timely communication with the neuroradiologist regarding the clinical findings and suspected location of lesions is emphasized so as to optimize the ordering and interpretation of imaging studies for the ophthalmologist.
Collapse
Affiliation(s)
- Andrew G Lee
- Department of Ophthalmology, Universiyt of Iowa Hospitals and Clinics, Iowa City, Iowa 52242, USA.
| | | | | | | |
Collapse
|
23
|
Dickerson BC, Sperling RA. Functional abnormalities of the medial temporal lobe memory system in mild cognitive impairment and Alzheimer's disease: insights from functional MRI studies. Neuropsychologia 2007; 46:1624-35. [PMID: 18206188 PMCID: PMC2760288 DOI: 10.1016/j.neuropsychologia.2007.11.030] [Citation(s) in RCA: 242] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2007] [Revised: 11/11/2007] [Accepted: 11/26/2007] [Indexed: 12/31/2022]
Abstract
Functional MRI (fMRI) studies of mild cognitive impairment (MCI) and Alzheimer's disease (AD) have begun to reveal abnormalities in memory circuit function in humans suffering from memory disorders. Since the medial temporal lobe (MTL) memory system is a site of very early pathology in AD, a number of studies, reviewed here, have focused on this region of the brain. By the time individuals are diagnosed clinically with AD dementia, the substantial memory impairments appear to be associated with not only MTL atrophy but also hypoactivation during memory task performance. Prior to dementia, when individuals are beginning to manifest signs and symptoms of memory impairment, the hippocampal formation and other components of the MTL memory system exhibit substantial functional abnormalities during memory task performance. It appears that, early in the course of MCI when memory deficits and hippocampal atrophy are less prominent, there may be hyperactivation of MTL circuits, possibly representing inefficient compensatory activity. Later in the course of MCI, when considerable memory deficits are present, MTL regions are no longer able to activate during attempted learning, as is the case in AD dementia. Recent fMRI data in MCI and AD are beginning to reveal relationships between abnormalities of functional activity in the MTL memory system and in functionally connected brain regions, such as the precuneus. As this work continues to mature, it will likely contribute to our understanding of fundamental memory processes in the human brain and how these are perturbed in memory disorders. We hope these insights will translate into the incorporation of measures of task-related brain function into diagnostic assessment or therapeutic monitoring, such as for use in clinical trials.
Collapse
Affiliation(s)
- Bradford C Dickerson
- Department of Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA.
| | | |
Collapse
|