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Seo F, Clouette J, Huang Y, Potvin‐Desrochers A, Lajeunesse H, Parent‐L'Ecuyer F, Traversa C, Paquette C, Churchward‐Venne TA. Changes in brain functional connectivity and muscle strength independent of elbow flexor atrophy following upper limb immobilization in young females. Exp Physiol 2024; 109:1557-1571. [PMID: 38935545 PMCID: PMC11363139 DOI: 10.1113/ep091782] [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: 01/26/2024] [Accepted: 06/11/2024] [Indexed: 06/29/2024]
Abstract
Muscle disuse induces a decline in muscle strength that exceeds the rate and magnitude of muscle atrophy, suggesting that factors beyond the muscle contribute to strength loss. The purpose of this study was to characterize changes in the brain and neuromuscular system in addition to muscle size following upper limb immobilization in young females. Using a within-participant, unilateral design, 12 females (age: 20.6 ± 2.1 years) underwent 14 days of upper arm immobilization using an elbow brace and sling. Bilateral measures of muscle strength (isometric and isokinetic dynamometry), muscle size (magnetic resonance imaging), voluntary muscle activation capacity, corticospinal excitability, cortical thickness and resting-state functional connectivity were collected before and after immobilization. Immobilization induced a significant decline in isometric elbow flexion (-21.3 ± 19.2%, interaction: P = 0.0440) and extension (-19.9 ± 15.7%, interaction: P = 0.0317) strength in the immobilized arm only. There was no significant effect of immobilization on elbow flexor cross-sectional area (CSA) (-1.2 ± 2.4%, interaction: P = 0.466), whereas elbow extensor CSA decreased (-2.9 ± 2.9%, interaction: P = 0.0177) in the immobilized arm. Immobilization did not differentially alter voluntary activation capacity, corticospinal excitability, or cortical thickness (P > 0.05); however, there were significant changes in the functional connectivity of brain regions related to movement planning and error detection (P < 0.05). This study reveals that elbow flexor strength loss can occur in the absence of significant elbow flexor muscle atrophy, and that the brain represents a site of functional adaptation in response to upper limb immobilization in young females.
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Affiliation(s)
- Freddie Seo
- Department of Kinesiology and Physical EducationMcGill UniversityMontrealQCCanada
| | - Julien Clouette
- Department of Kinesiology and Physical EducationMcGill UniversityMontrealQCCanada
| | - Yijia Huang
- Department of Kinesiology and Physical EducationMcGill UniversityMontrealQCCanada
| | - Alexandra Potvin‐Desrochers
- Department of Kinesiology and Physical EducationMcGill UniversityMontrealQCCanada
- Centre for Interdisciplinary Research in Rehabilitation of Greater MontrealMontrealQCCanada
| | - Henri Lajeunesse
- Department of Kinesiology and Physical EducationMcGill UniversityMontrealQCCanada
| | | | - Claire Traversa
- Department of Kinesiology and Physical EducationMcGill UniversityMontrealQCCanada
| | - Caroline Paquette
- Department of Kinesiology and Physical EducationMcGill UniversityMontrealQCCanada
- Centre for Interdisciplinary Research in Rehabilitation of Greater MontrealMontrealQCCanada
| | - Tyler A. Churchward‐Venne
- Department of Kinesiology and Physical EducationMcGill UniversityMontrealQCCanada
- Division of Geriatric MedicineMcGill UniversityMontrealQCCanada
- Research Institute of the McGill University Health CentreMontrealQCCanada
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Ramdani C, Hasbroucq T, Vidal F. Why is there an error negativity on correct trials? A reappraisal. Neurosci Lett 2024; 828:137731. [PMID: 38492881 DOI: 10.1016/j.neulet.2024.137731] [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: 01/16/2024] [Revised: 03/11/2024] [Accepted: 03/11/2024] [Indexed: 03/18/2024]
Abstract
In healthy subjects, the Error Negativity (Ne) was initially reported on errors and on partial errors, only. Later on, application of the Laplacian transformation to EEG data unmasked a Ne-like wave (Nc) that shares a main generator with the Ne, suggesting that the Nc is just a small Ne. However, the reason why a small Ne would persist on correct responses remains unclear. Now, sometimes, subthreshold EMG activations in the muscles corresponding to correct responses (not strong enough to reach the response threshold) can precede full-blown correct responses. These "partially correct" activities seem to correspond to (force) execution errors, as they evoke a sizeable Ne. Within the frames of the Reward Value and Prediction Model or of the Predicted Response-Outcome model we propose that the action monitoring system evokes a Ne/Nc on correct responses because, even when a correct choice has been made, the accuracy of response (force) execution cannot be fully predicted. If this interpretation is correct, it can be assumed that, once these execution errors have been corrected, the correctness of the (full-blown) correcting response is highly predictable. Consequently, they should evoke a smaller Nc/Ne than "pure" correct responses. We show, that for the response thresholds set in the present experiment, the correcting response of the trials containing a partially correct activation evoke no identifiable Nc at all. Therefore it seems that there usually is an Error Negativity on correct trials because the correctness of response (force) execution cannot be fully predicted.
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Affiliation(s)
- Céline Ramdani
- French Armed Forces Biomedical Research Institute, Resident Underwater Operational Research Team, Toulon, France.
| | - Thierry Hasbroucq
- Centre de Recherche en Psychologie et Neurosciences, UMR 7077CNRS-AMU, France
| | - Franck Vidal
- Centre de Recherche en Psychologie et Neurosciences, UMR 7077CNRS-AMU, France
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Ghaffari A, Asadi B, Zareian A, Akbarfahimi M, Raissi GR, Fathali Lavasani F. The Effects of Vestibular Rehabilitation on Poststroke Fatigue: A Randomized Controlled Trial Study. Stroke Res Treat 2022; 2022:3155437. [PMID: 36090743 PMCID: PMC9453100 DOI: 10.1155/2022/3155437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Accepted: 08/23/2022] [Indexed: 11/18/2022] Open
Abstract
Background A major complication caused by stroke is poststroke fatigue (PSF), and by causing limitations in doing activities of daily living (ADL), it can lower the quality of life. Objective The present study is an attempt to examine the effects of vestibular rehabilitation on BADL (Basic Activities of Daily Living), fatigue, depression, and Lawton Instrumental Activities of Daily Living (IADL) in patients with stroke. Method Patients with a history of stroke took part voluntarily in a single-blind clinical trial. The participants were allocated to control and experimental groups randomly. The experimental group attended 24 sessions of vestibular rehabilitation protocol, while the control group received the standard rehabilitation (including three sessions per week each for around 60 min). To measure fatigue, the Fatigue Impact Scale (FIS) and the Fatigue Assessment Scale (FAS) were used. Depression, BADL, and IADL were measured using the Beck Depression Inventory-II (BDI-II), Barthel Index (BI), and Lawton Instrumental Activities of Daily Living, respectively. All changes were measured from the baseline after the intervention. Results Significant improvement was found in the experimental group compared to the control group (p < 0.05) in FIS (physical, cognition, and social subscales), FAS, BDI-II, BADL, and IADL. Moreover, the results showed small to medium and large effect sizes for the physical subscale of FIS and FAS scores based on Cohen's d, respectively; however, no significant difference was found in terms of cognition and social subscales of FIS, BDI-II, BADL, and IADL scores. Conclusion It is possible to improve fatigue, depression, and independence in BADL and IADL using vestibular rehabilitation. Thus, it is an effective intervention in case of stroke, which is also well tolerated.
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Affiliation(s)
- Amin Ghaffari
- Department of Neurology, Faculty of Medicine, AJA University of Medical Sciences, Tehran, Iran
- Rehabilitation Research Center, Department of Occupational Therapy, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran
| | - Bahador Asadi
- Department of Neurology, Faculty of Medicine, AJA University of Medical Sciences, Tehran, Iran
| | - Armin Zareian
- Public Health Department, Health in Disaster & Emergencies Department, Nursing Faculty, AJA University of Medical Sciences, Tehran, Iran
| | - Malahat Akbarfahimi
- Rehabilitation Research Center, Department of Occupational Therapy, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran
| | - Gholam Reza Raissi
- Neuromusculoskeletal Research Center, Department of Physical Medicine and Rehabilitation, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Fahimeh Fathali Lavasani
- Clinical Psychology Department, Behavioral Sciences & Mental Health School (Tehran Psychiatry of Institute), Iran University of Medical Sciences, Tehran, Iran
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Structure and function of corticospinal projection originating from supplementary motor area. Neuroradiology 2021; 63:1283-1292. [PMID: 33611621 DOI: 10.1007/s00234-021-02669-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2020] [Accepted: 02/03/2021] [Indexed: 10/22/2022]
Abstract
PURPOSE The importance of supplementary motor area (SMA) for motor function and compensation for primary motor area (M1) has received increased attention. METHODS We used diffusion tensor imaging (DTI) and transcranial magnetic stimulation (TMS) to evaluate structure and function of corticospinal projection originating from SMA. Fibers of corticospinal projection originating from M1 (CST) and SMA (ACST) were analyzed. ACST originating from mesial SMA area formed separate white matter bundles leaving the anterior part of M1 area, which then entered the posterior limb of the internal capsule. Projection and overlap of both CST and ACST were detected on medulla. RESULTS Fibers of contralesional ACST were more than that of ipsilesional ACST in patients with SMA tumors (p<0.05). In patients with SMA tumor, all patients experienced temporary akinesia postoperatively. Seven hundred forty-one fibers of ipsilateral ACST and no fibers of ipsilateral CST were detected in the patient with M1 glioma, while most of contralateral limb movement was preserved. MEP could be evoked by stimulating SMA area as well as M1 area. ACST originated from SMA area and projected to the medial medulla. CONCLUSION SMA area and ACST integrity contributed to contralateral motor function and were a compensation for M1 lesion and damaged CST.
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Wilkins KB, Dewald JPA, Yao J. Intervention-induced changes in neural connectivity during motor preparation may affect cortical activity at motor execution. Sci Rep 2020; 10:7326. [PMID: 32355238 PMCID: PMC7193567 DOI: 10.1038/s41598-020-64179-x] [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: 09/16/2019] [Accepted: 04/07/2020] [Indexed: 12/22/2022] Open
Abstract
Effective interventions have demonstrated the ability to improve motor function by reengaging ipsilesional resources, which appears to be critical and feasible for hand function recovery even in individuals with severe chronic stroke. However, previous studies focus on changes in brain activity related to motor execution. How changes in motor preparation may facilitate these changes at motor execution is still unclear. To address this question, 8 individuals with severe chronic hemiparetic stroke participated in a device-assisted intervention for seven weeks. We then quantified changes in both coupling between regions during motor preparation and changes in topographical cortical activity at motor execution for both hand opening in isolation and together with the shoulder using high-density EEG. We hypothesized that intervention-induced changes in cortico-cortico interactions during motor preparation would lead to changes in activity at motor execution specifically towards an increased reliance on the ipsilesional hemisphere. In agreement with this hypothesis, we found that, following the intervention, individuals displayed a reduction in coupling from ipsilesional M1 to contralesional M1 within gamma frequencies during motor preparation for hand opening. This was followed by a reduction in activity in the contralesional primary sensorimotor cortex during motor execution. Similarly, during lifting and opening, a shift to negative coupling within ipsilesional M1 from gamma to beta frequencies was accompanied by an increase in ipsilesional primary sensorimotor cortex activity following the intervention. Together, these results show that intervention-induced changes in coupling within or between motor regions during motor preparation may affect cortical activity at execution.
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Affiliation(s)
- Kevin B Wilkins
- Department of Physical Therapy and Human Movement Sciences, Northwestern University, 645 N Michigan Ave, Suite 1100, Chicago, IL, 60611, USA
- Northwestern University Interdepartmental Neuroscience, Northwestern University, 320 E. Superior St, Chicago, IL, 60611, USA
| | - Julius P A Dewald
- Department of Physical Therapy and Human Movement Sciences, Northwestern University, 645 N Michigan Ave, Suite 1100, Chicago, IL, 60611, USA
- Northwestern University Interdepartmental Neuroscience, Northwestern University, 320 E. Superior St, Chicago, IL, 60611, USA
- Department of Biomedical Engineering, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208, USA
- Department of Physical Medicine and Rehabilitation, Northwestern University, 345 East Superior Street, Chicago, IL, 60611, USA
| | - Jun Yao
- Department of Physical Therapy and Human Movement Sciences, Northwestern University, 645 N Michigan Ave, Suite 1100, Chicago, IL, 60611, USA.
- Northwestern University Interdepartmental Neuroscience, Northwestern University, 320 E. Superior St, Chicago, IL, 60611, USA.
- Department of Biomedical Engineering, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208, USA.
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Siponkoski ST, Martínez-Molina N, Kuusela L, Laitinen S, Holma M, Ahlfors M, Jordan-Kilkki P, Ala-Kauhaluoma K, Melkas S, Pekkola J, Rodriguez-Fornells A, Laine M, Ylinen A, Rantanen P, Koskinen S, Lipsanen J, Särkämö T. Music Therapy Enhances Executive Functions and Prefrontal Structural Neuroplasticity after Traumatic Brain Injury: Evidence from a Randomized Controlled Trial. J Neurotrauma 2020; 37:618-634. [DOI: 10.1089/neu.2019.6413] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Affiliation(s)
- Sini-Tuuli Siponkoski
- Department of Psychology and Logopedics, Cognitive Brain Research Unit, University of Helsinki, Helsinki, Finland
| | - Noelia Martínez-Molina
- Department of Psychology and Logopedics, Cognitive Brain Research Unit, University of Helsinki, Helsinki, Finland
| | - Linda Kuusela
- HUS Medical Imaging Center, Department of Radiology, Helsinki Central University Hospital and University of Helsinki, Helsinki, Finland
- Department of Physics, University of Helsinki, Helsinki, Finland
| | | | - Milla Holma
- Musiikkiterapiaosuuskunta InstruMental (Music Therapy Cooperative InstruMental), Helsinki, Finland
| | | | | | - Katja Ala-Kauhaluoma
- Ludus Oy Tutkimus- ja kuntoutuspalvelut (Assessment and Intervention Services), Helsinki, Finland
| | - Susanna Melkas
- Department of Neurology and Brain Injury Outpatient Clinic, Helsinki University Central Hospital, Helsinki, Finland
| | - Johanna Pekkola
- HUS Medical Imaging Center, Department of Radiology, Helsinki Central University Hospital and University of Helsinki, Helsinki, Finland
| | - Antoni Rodriguez-Fornells
- Cognition and Brain Plasticity Group, Bellvitge Biomedical Research Institute, L'Hospitalet de Llobregat, Barcelona, Spain
- Department of Cognition, Development and Educational Psychology, University of Barcelona, Barcelona, Spain
- Catalan Institution for Research and Advanced Studies, Barcelona, Spain
| | - Matti Laine
- Department of Psychology, Åbo Akademi University, Turku, Finland
| | - Aarne Ylinen
- Department of Neurology and Brain Injury Outpatient Clinic, Helsinki University Central Hospital, Helsinki, Finland
- Tampere University Hospital, Tampere, Finland
| | | | - Sanna Koskinen
- Department of Psychology and Logopedics, University of Helsinki, Helsinki, Finland
| | - Jari Lipsanen
- Department of Psychology and Logopedics, University of Helsinki, Helsinki, Finland
| | - Teppo Särkämö
- Department of Psychology and Logopedics, Cognitive Brain Research Unit, University of Helsinki, Helsinki, Finland
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Vidal F, Burle B, Hasbroucq T. Errors and Action Monitoring: Errare Humanum Est Sed Corrigere Possibile. Front Hum Neurosci 2020; 13:453. [PMID: 31998101 PMCID: PMC6962188 DOI: 10.3389/fnhum.2019.00453] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Accepted: 12/09/2019] [Indexed: 01/12/2023] Open
Abstract
It was recognized long ago by Seneca through his famous "errare humanum est." that the human information processing system is intrinsically fallible. What is newer is the fact that, at least in sensorimotor information processing realized under time pressure, errors are largely dealt with by several (psycho)physiological-specific mechanisms: prevention, detection, inhibition, correction, and, if these mechanisms finally fail, strategic behavioral adjustments following errors. In this article, we review several datasets from laboratory experiments, showing that the human information processing system is well equipped not only to detect and correct errors when they occur but also to detect, inhibit, and correct them even before they fully develop. We argue that these (psycho)physiological mechanisms are important to consider when the brain works in everyday settings in order to render work systems more resilient to human errors and, thus, safer.
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Affiliation(s)
- Franck Vidal
- Aix-Marseille Université, CNRS, LNC UMR 7291, Marseille, France
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8
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Quandt F, Bönstrup M, Schulz R, Timmermann JE, Mund M, Wessel MJ, Hummel FC. The functional role of beta-oscillations in the supplementary motor area during reaching and grasping after stroke: A question of structural damage to the corticospinal tract. Hum Brain Mapp 2019; 40:3091-3101. [PMID: 30927325 PMCID: PMC6865486 DOI: 10.1002/hbm.24582] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2018] [Revised: 02/18/2019] [Accepted: 03/15/2019] [Indexed: 12/18/2022] Open
Abstract
Hand motor function is often severely affected in stroke patients. Non-satisfying recovery limits reintegration into normal daily life. Understanding stroke-related network changes and identifying common principles that might underlie recovered motor function is a prerequisite for the development of interventional therapies to support recovery. Here, we combine the evaluation of functional activity (multichannel electroencephalography) and structural integrity (diffusion tensor imaging) in order to explain the degree of residual motor function in chronic stroke patients. By recording neural activity during a reaching and grasping task that mimics activities of daily living, the study focuses on deficit-related neural activation patterns. The study showed that the functional role of movement-related beta desynchronization in the supplementary motor area (SMA) for residual hand motor function in stroke patients depends on the microstructural integrity of the corticospinal tract (CST). In particular, in patients with damaged CST, stronger task-related activity in the SMA was associated with worse residual motor function. Neither CST damage nor functional brain activity alone sufficiently explained residual hand motor function. The findings suggest a central role of the SMA in the motor network during reaching and grasping in stroke patients, the degree of functional relevance of the SMA is depending on CST integrity.
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Affiliation(s)
- Fanny Quandt
- Department of NeurologyUniversity Medical Center Hamburg‐EppendorfHamburgGermany
| | - Marlene Bönstrup
- Department of NeurologyUniversity Medical Center Hamburg‐EppendorfHamburgGermany
- Human Cortical Physiology and Neurorehabilitation SectionNational Institute of Neurological Disorders and Stroke, National Institutes of HealthBethesdaMaryland
| | - Robert Schulz
- Department of NeurologyUniversity Medical Center Hamburg‐EppendorfHamburgGermany
| | - Jan E. Timmermann
- Department of NeurologyUniversity Medical Center Hamburg‐EppendorfHamburgGermany
| | - Maike Mund
- Department of NeurologyUniversity Medical Center Hamburg‐EppendorfHamburgGermany
| | - Maximilian J. Wessel
- Defitech Chair of Clinical NeuroengineeringBrain Mind Institute and Center for Neuroprosthetics, Swiss Federal Institute of Technology (EPFL)GenevaSwitzerland
- Defitech Chair of Clinical NeuroengineeringBrain Mind Institute and Center for Neuroprosthetics, Swiss Federal Institute of Technology Valais (EPFL Valais), Clinique Romande de RéadaptationSionSwitzerland
| | - Friedhelm C. Hummel
- Defitech Chair of Clinical NeuroengineeringBrain Mind Institute and Center for Neuroprosthetics, Swiss Federal Institute of Technology (EPFL)GenevaSwitzerland
- Defitech Chair of Clinical NeuroengineeringBrain Mind Institute and Center for Neuroprosthetics, Swiss Federal Institute of Technology Valais (EPFL Valais), Clinique Romande de RéadaptationSionSwitzerland
- Clinical NeuroscienceMedical School University of GenevaGenevaSwitzerland
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Vidal F, Burle B, Hasbroucq T. The Way We Do the Things We Do: How Cognitive Contexts Shape the Neural Dynamics of Motor Areas in Humans. Front Psychol 2018; 9:1296. [PMID: 30100890 PMCID: PMC6073480 DOI: 10.3389/fpsyg.2018.01296] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Accepted: 07/05/2018] [Indexed: 11/23/2022] Open
Abstract
In spontaneously triggered movements the nature of the executed response has a prominent effect on the intensity and the dynamics of motor areas recruitment. Under time pressure, the time course of motor areas recruitment is necessarily shorter than that of spontaneously triggered movements because RTs may be extremely short. Moreover, different classes of RT tasks allow examining the nature and the dynamics of motor areas activation in different cognitive contexts. In the present article, we review experimental results obtained from high temporal resolution methods (mainly, but not exclusively EEG ones), during voluntary movements; these results indicate that the activity of motor areas not only depends on the nature of the executed movement but also on the cognitive context in which these movements have to be executed.
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Affiliation(s)
- Franck Vidal
- Aix-Marseille Université, CNRS, LNC UMR 7291, Marseille, France
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10
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Zhao Z, Tang C, Yin D, Wu J, Gong J, Sun L, Jia J, Xu D, Fan M. Frequency-specific alterations of regional homogeneity in subcortical stroke patients with different outcomes in hand function. Hum Brain Mapp 2018; 39:4373-4384. [PMID: 29972261 DOI: 10.1002/hbm.24277] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Revised: 05/10/2018] [Accepted: 06/15/2018] [Indexed: 12/24/2022] Open
Abstract
Emerging evidence has suggested that abnormalities in regional spontaneous brain activity following stroke may be detected by intrinsic low-frequency oscillations (LFO) in resting-state functional MRI (R-fMRI). However, the relationship between hand function outcomes following stroke and local LFO synchronization in different frequency bands is poorly understood. In this study, we performed R-fMRI to examine the regional homogeneity (ReHo) at three different frequency bands (slow-5: .01-.027 Hz; slow-4: .027-.08 Hz; and typical band: .01-.1 Hz) in 26 stroke patients with completely paralyzed hands (CPH) and 26 matched patients with partially paralyzed hands (PPH). Compared to the PPH group, decreased ReHo in the bilateral cerebellum posterior lobes and the contralesional cerebellum anterior lobe was observed in the slow-5 band and the slow-4 band in the CPH group, respectively. The mean ReHo values in these regions were positively correlated with the Fugl-Meyer assessment (FMA) scores. In contrast, increased ReHo in the contralesional supplementary motor area and the contralesional superior temporal gyrus was observed in the slow-4 band and the slow-5 band, respectively. The mean ReHo values in these regions were negatively correlated with the FMA scores. Importantly, significant interactions were identified between the frequency bands and the subgroups of patients in the contralesional precentral gyrus and middle frontal gyrus. These findings indicate that frequency-dependent R-fMRI patterns may serve as potential biomarkers of the neural substrates associated with hand function outcomes following stroke.
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Affiliation(s)
- Zhiyong Zhao
- Department of Physics, Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, Shanghai, China
| | - Chaozheng Tang
- Department of Rehabilitation Medicine, Huashan Hospital, Fudan University, Shanghai, China
| | - Dazhi Yin
- State Key Laboratory of Neuroscience, Key Laboratory of Primate Neurobiology, Institute of Neuroscience, CAS Center for Excellence in Brain Science and Intelligence Technology, Shanghai Institute for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Jie Wu
- Department of Physics, Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, Shanghai, China
| | - Jiayu Gong
- Department of Physics, Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, Shanghai, China
| | - Limin Sun
- Department of Rehabilitation Medicine, Huashan Hospital, Fudan University, Shanghai, China
| | - Jie Jia
- Department of Rehabilitation Medicine, Huashan Hospital, Fudan University, Shanghai, China
| | - Dongrong Xu
- Department of psychiatry, New York State Psychiatric Institute and Columbia University, New York, New York
| | - Mingxia Fan
- Department of Physics, Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, Shanghai, China
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11
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Auditory Target and Novelty Processing in Patients with Unilateral Hippocampal Sclerosis: A Current-Source Density Study. Sci Rep 2017; 7:1612. [PMID: 28487515 PMCID: PMC5431625 DOI: 10.1038/s41598-017-01531-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Accepted: 03/30/2017] [Indexed: 11/29/2022] Open
Abstract
The capacity to respond to novel events is crucial for adapting to the constantly changing environment. Here, we recorded 29-channel Event Related Brain Potentials (ERPs) during an active auditory novelty oddball paradigm and used for the first time Current Source Density-transformed Event Related Brain Potentials and associated time-frequency spectra to study target and novelty processing in a group of epileptic patients with unilateral damage of the hippocampus (N = 18) and in healthy matched control participants (N = 18). Importantly, we used Voxel-Based Morphometry to ensure that our group of patients had a focal unilateral damage restricted to the hippocampus and especially its medial part. We found a clear deficit for target processing at the behavioral level. In addition, compared to controls, our group of patients presented (i) a reduction of theta event-related synchronization (ERS) for targets and (ii) a reduction and delayed P3a source accompanied by reduced theta and low-beta ERS and alpha event-related synchronization (ERD) for novel stimuli. These results suggest that the integrity of the hippocampus might be crucial for the functioning of the complex cortico-subcortical network involved in the detection of novel and target stimuli.
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Kayser J, Tenke CE. Issues and considerations for using the scalp surface Laplacian in EEG/ERP research: A tutorial review. Int J Psychophysiol 2015; 97:189-209. [PMID: 25920962 DOI: 10.1016/j.ijpsycho.2015.04.012] [Citation(s) in RCA: 152] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Revised: 03/26/2015] [Accepted: 04/13/2015] [Indexed: 12/01/2022]
Abstract
Despite the recognition that the surface Laplacian may counteract adverse effects of volume conduction and recording reference for surface potential data, electrophysiology as a discipline has been reluctant to embrace this approach for data analysis. The reasons for such hesitation are manifold but often involve unfamiliarity with the nature of the underlying transformation, as well as intimidation by a perceived mathematical complexity, and concerns of signal loss, dense electrode array requirements, or susceptibility to noise. We revisit the pitfalls arising from volume conduction and the mandated arbitrary choice of EEG reference, describe the basic principle of the surface Laplacian transform in an intuitive fashion, and exemplify the differences between common reference schemes (nose, linked mastoids, average) and the surface Laplacian for frequently-measured EEG spectra (theta, alpha) and standard event-related potential (ERP) components, such as N1 or P3. We specifically review common reservations against the universal use of the surface Laplacian, which can be effectively addressed by employing spherical spline interpolations with an appropriate selection of the spline flexibility parameter and regularization constant. We argue from a pragmatic perspective that not only are these reservations unfounded but that the continued predominant use of surface potentials poses a considerable impediment on the progress of EEG and ERP research.
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Affiliation(s)
- Jürgen Kayser
- Division of Cognitive Neuroscience, New York State Psychiatric Institute, New York, NY, USA; Department of Psychiatry, Columbia University College of Physicians & Surgeons, New York, NY, USA.
| | - Craig E Tenke
- Division of Cognitive Neuroscience, New York State Psychiatric Institute, New York, NY, USA; Department of Psychiatry, Columbia University College of Physicians & Surgeons, New York, NY, USA
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