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Chen SY, Tsou MH, Chen KY, Liu YC, Lin MT. Impact of repetitive transcranial magnetic stimulation on cortical activity: a systematic review and meta-analysis utilizing functional near-infrared spectroscopy evaluation. J Neuroeng Rehabil 2024; 21:108. [PMID: 38915003 PMCID: PMC11194950 DOI: 10.1186/s12984-024-01407-9] [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: 03/10/2024] [Accepted: 06/19/2024] [Indexed: 06/26/2024] Open
Abstract
BACKGROUND Repeated transcranial magnetic stimulation (rTMS) could induce alterations in cortical excitability and promote neuroplasticity. To precisely quantify these effects, functional near-infrared spectroscopy (fNIRS), an optical neuroimaging modality adept at detecting changes in cortical hemodynamic responses, has been employed concurrently alongside rTMS to measure and tailor the impact of diverse rTMS protocols on the brain cortex. OBJECTIVE This systematic review and meta-analysis aimed to elucidate the effects of rTMS on cortical hemodynamic responses over the primary motor cortex (M1) as detected by fNIRS. METHODS Original articles that utilized rTMS to stimulate the M1 cortex in combination with fNIRS for the assessment of cortical activity were systematically searched across the PubMed, Embase, and Scopus databases. The search encompassed records from the inception of these databases up until April, 2024. The assessment for risk of bias was also conducted. A meta-analysis was also conducted in studies with extractable raw data. RESULTS Among 312 studies, 14 articles were eligible for qualitative review. 7 studies were eligible for meta-analysis. A variety of rTMS protocols was employed on M1 cortex. In inhibitory rTMS, multiple studies observed a reduction in the concentration of oxygenated hemoglobin [HbO] at the ipsilateral M1, contrasted by an elevation at the contralateral M1. Meta-analysis also corroborated this consistent trend. Nevertheless, certain investigations unveiled diminished [HbO] in bilateral M1. Several studies also depicted intricate inhibitory or excitatory interplay among distinct cortical regions. CONCLUSION Diverse rTMS protocols led to varied patterns of cortical activity detected by fNIRS. Meta-analysis revealed a trend of increasing [HbO] in the contralateral cortices and decreasing [HbO] in the ipsilateral cortices following low frequency inhibitory rTMS. However, due to the heterogeneity between studies, further research is necessary to comprehensively understand rTMS-induced alterations in brain activity.
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Affiliation(s)
- Shao-Yu Chen
- Department of Physical Medicine and Rehabilitation, National Taiwan University Hospital, College of Medicine, National Taiwan University, No. 7 Chung-Shan South Road, Taipei City, 10002, Taiwan
| | - Meng-Hsuan Tsou
- School and Graduate Institute of Physical Therapy, College of Medicine, National Taiwan University, 3F., No.17, Xuzhou Rd., Zhongzheng Dist, Taipei City, 10002, Taiwan
| | - Kuan-Yu Chen
- Department of Physical Medicine and Rehabilitation, National Taiwan University Hospital, College of Medicine, National Taiwan University, No. 7 Chung-Shan South Road, Taipei City, 10002, Taiwan
| | - Yan-Ci Liu
- School and Graduate Institute of Physical Therapy, College of Medicine, National Taiwan University, 3F., No.17, Xuzhou Rd., Zhongzheng Dist, Taipei City, 10002, Taiwan.
- Physical Therapy Center, National Taiwan University Hospital, College of Medicine, National Taiwan University, No. 1, Changde St., Zhongzheng Dist, Taipei City, 10022, Taiwan.
| | - Meng-Ting Lin
- Department of Physical Medicine and Rehabilitation, National Taiwan University Hospital, College of Medicine, National Taiwan University, No. 7 Chung-Shan South Road, Taipei City, 10002, Taiwan.
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Gorban C, Zhang Z, Mensen A, Khatami R. The Comparison of Early Hemodynamic Response to Single-Pulse Transcranial Magnetic Stimulation following Inhibitory or Excitatory Theta Burst Stimulation on Motor Cortex. Brain Sci 2023; 13:1609. [PMID: 38002568 PMCID: PMC10670137 DOI: 10.3390/brainsci13111609] [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: 10/12/2023] [Revised: 11/14/2023] [Accepted: 11/15/2023] [Indexed: 11/26/2023] Open
Abstract
We present a new study design aiming to enhance the understanding of the mechanism by which continuous theta burst stimulation (cTBS) or intermittent theta burst stimulation (iTBS) paradigms elicit cortical modulation. Using near-infrared spectroscopy (NIRS), we compared the cortical hemodynamics of the previously inhibited (after cTBS) or excited (after iTBS) left primary motor cortex (M1) as elicited by single-pulse TMS (spTMS) in a cross-over design. Mean relative changes in hemodynamics within 6 s of the stimulus were compared using a two-sample t-test (p < 0.05) and linear mixed model between real and sham stimuli and between stimuli after cTBS and iTBS. Only spTMS after cTBS resulted in a significant increase (p = 0.04) in blood volume (BV) compared to baseline. There were no significant changes in other hemodynamic parameters (oxygenated/deoxygenated hemoglobin). spTMS after cTBS induced a larger increase in BV than spTMS after iTBS (p = 0.021) and sham stimulus after cTBS (p = 0.009). BV showed no significant difference between real and sham stimuli after iTBS (p = 0.37). The greater hemodynamic changes suggest increased vasomotor reactivity after cTBS compared to iTBS. In addition, cTBS could decrease lateral inhibition, allowing activation of surrounding areas after cTBS.
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Affiliation(s)
- Corina Gorban
- Center for Sleep Medicine, Sleep Research and Epileptology, Clinic Barmelweid, 5017 Barmelweid, Switzerland; (C.G.); (A.M.); (R.K.)
- Department of Neurology, Bern University Hospital, University of Bern, 3012 Bern, Switzerland
| | - Zhongxing Zhang
- Center for Sleep Medicine, Sleep Research and Epileptology, Clinic Barmelweid, 5017 Barmelweid, Switzerland; (C.G.); (A.M.); (R.K.)
| | - Armand Mensen
- Center for Sleep Medicine, Sleep Research and Epileptology, Clinic Barmelweid, 5017 Barmelweid, Switzerland; (C.G.); (A.M.); (R.K.)
| | - Ramin Khatami
- Center for Sleep Medicine, Sleep Research and Epileptology, Clinic Barmelweid, 5017 Barmelweid, Switzerland; (C.G.); (A.M.); (R.K.)
- Department of Neurology, Bern University Hospital, University of Bern, 3012 Bern, Switzerland
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Balloff C, Penner IK, Ma M, Georgiades I, Scala L, Troullinakis N, Graf J, Kremer D, Aktas O, Hartung HP, Meuth SG, Schnitzler A, Groiss SJ, Albrecht P. The degree of cortical plasticity correlates with cognitive performance in patients with Multiple Sclerosis. Brain Stimul 2022; 15:403-413. [PMID: 35182811 DOI: 10.1016/j.brs.2022.02.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Revised: 02/14/2022] [Accepted: 02/14/2022] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND Cortical reorganization and plasticity may compensate for structural damage in Multiple Sclerosis (MS). It is important to establish sensitive methods to measure these compensatory mechanisms, as they may be of prognostic value. OBJECTIVE To investigate the association between the degree of cortical plasticity and cognitive performance and to compare plasticity between MS patients and healthy controls (HCs). METHODS The amplitudes of the motor evoked potential (MEP) pre and post quadripulse stimulation (QPS) applied over the contralateral motor cortex served as measure of the degree of cortical plasticity in 63 patients with relapsing-remitting MS (RRMS) and 55 matched HCs. The main outcomes were the correlation coefficients between the difference of MEP amplitudes post and pre QPS and the Symbol Digit Modalities Test (SDMT) and Brief Visuospatial Memory Test-Revised (BVMT-R), and the QPSxgroup interaction in a mixed model predicting the MEP amplitude. RESULTS SDMT and BVMT-R correlated significantly with QPS-induced cortical plasticity in RRMS patients. Plasticity was significantly reduced in patients with cognitive impairment compared to patients with preserved cognitive function and the degree of plasticity differentiated between both patient groups. Interestingly, the overall RRMS patient cohort did not show reduced plasticity compared to HCs. CONCLUSIONS We provide first evidence that QPS-induced plasticity may inform about the global synaptic plasticity in RRMS which correlates with cognitive performance as well as clinical disability. Larger longitudinal studies on patients with MS are needed to investigate the relevance and prognostic value of this measure for disease progression and recovery.
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Affiliation(s)
- Carolin Balloff
- Department of Neurology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany; Institute of Clinical Neuroscience and Medical Psychology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany
| | - Iris-Katharina Penner
- Department of Neurology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany; Cogito Center for Applied Neurocognition and Neuropsychological Research, 40225, Düsseldorf, Germany; Department of Neurology, Inselspital, University Hospital Bern, 3010, Bern, Switzerland
| | - Meng Ma
- Department of Neurology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany
| | - Iason Georgiades
- Department of Neurology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany
| | - Lina Scala
- Department of Neurology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany
| | - Nina Troullinakis
- Department of Neurology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany
| | - Jonas Graf
- Department of Neurology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany
| | - David Kremer
- Department of Neurology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany
| | - Orhan Aktas
- Department of Neurology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany
| | - Hans-Peter Hartung
- Department of Neurology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany; Brain and Mind Center, University of Sydney, NSW, 2006, Australia; Department of Neurology, Medical University of Vienna, 1090, Vienna, Austria
| | - Sven Günther Meuth
- Department of Neurology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany
| | - Alfons Schnitzler
- Department of Neurology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany; Institute of Clinical Neuroscience and Medical Psychology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany
| | - Stefan Jun Groiss
- Department of Neurology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany; Institute of Clinical Neuroscience and Medical Psychology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany.
| | - Philipp Albrecht
- Department of Neurology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany
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Hassan SS, Trenado C, Rageh TA, Schnitzler A, Groiss SJ. Effect of conditioning and test stimulus intensity on cortical excitability using triad-conditioning transcranial magnetic stimulation. Exp Brain Res 2020; 238:1305-1309. [PMID: 32322929 PMCID: PMC7237525 DOI: 10.1007/s00221-020-05812-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Accepted: 04/13/2020] [Indexed: 01/17/2023]
Abstract
Cortical facilitation assessed with triad conditioning transcranial magnetic stimulation has been termed triad-conditioned facilitation (TCF). TCF has been supposed to reflect increased intracortical facilitation (ICF) at short interstimulus intervals (ISI) around 10 ms and an intrinsic rhythm of the motor cortex at longer ISI around 25 ms. To gain further insight into the pathophysiological mechanism of TCF, we systematically studied the effect of suprathreshold conditioning stimulus (CS) and test stimulus (TS) intensity on TCF. Various CS intensities and TS intensities were used in a triad-conditioning paradigm that was applied to 11 healthy subjects. ISI between pulses were studied between 5 and 200 ms. TCF at 10 ms ISI enhanced with increasing CS intensity but decreased with increasing TS intensity. The duration of facilitation was longer with higher CS intensity. However, TCF at 25 ms ISI could not be elicited with none of the CS and TS intensities addressed here. Our results are consistent with the notion of TCF at short ISI reflecting ICF. The enhanced and prolonged facilitation with increase of CS without additional isolated facilitation at longer ISI suggest a prolongation of ICF.
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Affiliation(s)
- Shady Safwat Hassan
- Institute of Clinical Neuroscience and Medical Psychology, Medical Faculty, Heinrich Heine University, Düsseldorf, Germany
- Department of Neurology, Assiut University Hospital, Assiut, Egypt
| | - Carlos Trenado
- Institute of Clinical Neuroscience and Medical Psychology, Medical Faculty, Heinrich Heine University, Düsseldorf, Germany
- Translational Neuromodulation Unit, Department of Psychology and Neurosciences, Leibniz Research Centre for Working Environment and Human Factors, Technical University Dortmund, Dortmund, Germany
| | - Tarek Ali Rageh
- Department of Neurology, Assiut University Hospital, Assiut, Egypt
| | - Alfons Schnitzler
- Institute of Clinical Neuroscience and Medical Psychology, Medical Faculty, Heinrich Heine University, Düsseldorf, Germany
- Department of Neurology, Medical Faculty, Heinrich Heine University, Moorenstr 5, 40225, Düsseldorf, Germany
| | - Stefan Jun Groiss
- Institute of Clinical Neuroscience and Medical Psychology, Medical Faculty, Heinrich Heine University, Düsseldorf, Germany.
- Department of Neurology, Medical Faculty, Heinrich Heine University, Moorenstr 5, 40225, Düsseldorf, Germany.
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Snyder AZ, Bauer AQ. Mapping Structure-Function Relationships in the Brain. BIOLOGICAL PSYCHIATRY. COGNITIVE NEUROSCIENCE AND NEUROIMAGING 2019; 4:510-521. [PMID: 30528965 PMCID: PMC6488459 DOI: 10.1016/j.bpsc.2018.10.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Revised: 10/17/2018] [Accepted: 10/17/2018] [Indexed: 01/06/2023]
Abstract
Mapping the structural and functional connectivity of the brain is a major focus of systems neuroscience research and will help to identify causally important changes in neural circuitry responsible for behavioral dysfunction. Several methods for examining brain activity in humans have been extended to rodent and monkey models in which molecular and genetic manipulations exist for linking to human disease. In this review, which is part of a special issue focused on bridging brain connectivity information across species and spatiotemporal scales, we address mapping brain activity and neural connectivity in rodents using optogenetics in conjunction with either functional magnetic resonance imaging or optical intrinsic signal imaging. We chose to focus on these techniques because they are capable of reporting spontaneous or evoked hemodynamic activity most closely linked to human neuroimaging studies. We discuss the capabilities and limitations of blood-based imaging methods, usage of optogenetic techniques to map neural systems in rodent models, and other powerful mapping techniques for examining neural connectivity over different spatial and temporal scales. We also discuss implementing strategies for mapping brain connectivity in humans with both basic and clinical applications, and conclude with how cross-species mapping studies can be utilized to influence preclinical imaging studies and clinical practices alike.
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Affiliation(s)
- Abraham Z Snyder
- Department of Radiology, Washington University School of Medicine, St. Louis, Missouri
| | - Adam Q Bauer
- Department of Radiology, Washington University School of Medicine, St. Louis, Missouri.
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Li R, Potter T, Wang J, Shi Z, Wang C, Yang L, Chan R, Zhang Y. Cortical Hemodynamic Response and Connectivity Modulated by Sub-threshold High-Frequency Repetitive Transcranial Magnetic Stimulation. Front Hum Neurosci 2019; 13:90. [PMID: 30941025 PMCID: PMC6434517 DOI: 10.3389/fnhum.2019.00090] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2018] [Accepted: 02/25/2019] [Indexed: 01/06/2023] Open
Abstract
Repetitive transcranial magnetic stimulation (rTMS) at sub-threshold intensity is a viable clinical strategy to enhance the sensory and motor functions of extremities by increasing or decreasing motor cortical excitability. Despite this, it remains unclear how sub-threshold rTMS modulates brain cortical excitability and connectivity. In this study, we applied functional near-infrared spectroscopy (fNIRS) to investigate the alterations in hemodynamic responses and cortical connectivity patterns that are induced by high-frequency rTMS at a sub-threshold intensity. Forty high-frequency (10 Hz) trains of rTMS at 90% resting motor threshold (RMT) were delivered through a TMS coil placed over 1–2 cm lateral from the vertex. fNIRS signals were acquired from the frontal and bilateral motor areas in healthy volunteers (n = 20) during rTMS administration and at rest. A significant reduction in oxygenated hemoglobin (HbO) concentration was observed in most defined regions of interest (ROIs) during the stimulation period (p < 0.05). Decreased functional connectivity within prefrontal areas as well as between symmetrical ROI-pairs was also observed in most participants during the stimulation (p < 0.05). Results suggest that fNIRS imaging is able to provide a reliable measure of regional cortical brain activation that advances our understanding of the manner in which sub-threshold rTMS affects cortical excitability and brain connectivity.
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Affiliation(s)
- Rihui Li
- Department of Biomedical Engineering, University of Houston, Houston, TX, United States
| | - Thomas Potter
- Department of Biomedical Engineering, University of Houston, Houston, TX, United States
| | - Jun Wang
- Guangdong Provincial Work Injury Rehabilitation Hospital, Guangzhou, China
| | - Zhixi Shi
- Guangdong Provincial Work Injury Rehabilitation Hospital, Guangzhou, China
| | - Chushan Wang
- Guangdong Provincial Work Injury Rehabilitation Hospital, Guangzhou, China
| | - Lingling Yang
- Department of Computer Science, Sun Yat-sen University, Guangzhou, China
| | - Rosa Chan
- Department of Electrical Engineering, City University of Hong Kong, Hong Kong, China
| | - Yingchun Zhang
- Department of Biomedical Engineering, University of Houston, Houston, TX, United States
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Curtin A, Tong S, Sun J, Wang J, Onaral B, Ayaz H. A Systematic Review of Integrated Functional Near-Infrared Spectroscopy (fNIRS) and Transcranial Magnetic Stimulation (TMS) Studies. Front Neurosci 2019; 13:84. [PMID: 30872985 PMCID: PMC6403189 DOI: 10.3389/fnins.2019.00084] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Accepted: 01/25/2019] [Indexed: 01/10/2023] Open
Abstract
Background: The capacity for TMS to elicit neural activity and manipulate cortical excitability has created significant expectation regarding its use in both cognitive and clinical neuroscience. However, the absence of an ability to quantify stimulation effects, particularly outside of the motor cortex, has led clinicians and researchers to pair noninvasive brain stimulation with noninvasive neuroimaging techniques. fNIRS, as an optical and wearable neuroimaging technique, is an ideal candidate for integrated use with TMS. Together, TMS+fNIRS may offer a hybrid alternative to "blind" stimulation to assess NIBS in therapy and research. Objective: In this systematic review, the current body of research into the transient and prolonged effects of TMS on fNIRS-based cortical hemodynamic measures while at rest and during tasks are discussed. Additionally, studies investigating the relation of fNIRS to measures of cortical excitability as produced by TMS-evoked Motor-Evoked-Potential (MEP) are evaluated. The aim of this review is to outline the integrated use of TMS+fNIRS and consolidate findings related to use of fNIRS to monitor changes attributed to TMS and the relationship of fNIRS to cortical excitability itself. Methods: Key terms were searched in PubMed and Web-of-Science to identify studies investigating the use of both fNIRS and TMS. Works from Google-Scholar and referenced works in identified papers were also assessed for relevance. All published experimental studies using both fNIRS and TMS techniques in the study methodology were included. Results: A combined literature search of neuroimaging and neurostimulation studies identified 53 papers detailing the joint use of fNIRS and TMS. 22/53 investigated the immediate effects of TMS at rest in the DLPFC and M1 as measured by fNIRS. 21/22 studies reported a significant effect in [HbO] for 40/54 stimulation conditions with 14 resulting an increase and 26 in a decrease. While 15/22 studies also reported [HbR], only 5/37 conditions were significant. Task effects of fNIRS+TMS were detailed in 16 studies, including 10 with clinical populations. Most studies only reported significant changes in [HbO] related measures. Studies comparing fNIRS to changes in MEP-measured cortical excitability suggest that fNIRS measures may be spatially more diffuse but share similar traits. Conclusion: This review summarizes the progress in the development of this emerging hybrid neuroimaging & neurostimulation methodology and its applications. Despite encouraging progress and novel applications, a lack of replicated works, along with highly disparate methodological approaches, highlight the need for further controlled studies. Interpretation of current research directions, technical challenges of TMS+fNIRS, and recommendations regarding future works are discussed.
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Affiliation(s)
- Adrian Curtin
- Drexel University, School of Biomedical Engineering, Science and Health Systems, Philadelphia, PA, United States.,School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Shanbao Tong
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Junfeng Sun
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Jijun Wang
- Shanghai Mental Health Center, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Banu Onaral
- Drexel University, School of Biomedical Engineering, Science and Health Systems, Philadelphia, PA, United States
| | - Hasan Ayaz
- Drexel University, School of Biomedical Engineering, Science and Health Systems, Philadelphia, PA, United States.,Department of Family and Community Health, University of Pennsylvania, Philadelphia, PA, United States.,Center for Injury Research and Prevention, Children's Hospital of Philadelphia, Philadelphia, PA, United States
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Blood oxygenation changes resulting from subthreshold high frequency repetitive transcranial magnetic stimulation. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2018; 2017:1513-1516. [PMID: 29060167 DOI: 10.1109/embc.2017.8037123] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Effects of high frequency repetitive transcranial magnetic stimulation (rTMS) with a subthreshold intensity on hemodynamic response in brain cortices (both motor and prefrontal cortices) was investigated using the functional near infrared spectroscopy (fNIRS) technique. FNIRS signals of the motor and prefrontal cortices were acquired in healthy volunteers (n=7) at rest and during rTMS intervention. A significant reduction in oxygenated hemoglobin (HbO) concentration during the entire stimulation process was observed from both motor and prefrontal cortices. Results showed that the fNIRS technique can provide a reliable measure of regional cortical brain activation that could be valuable in studying cortical excitability connectivity in combination with rTMS.
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Huang YZ, Lu MK, Antal A, Classen J, Nitsche M, Ziemann U, Ridding M, Hamada M, Ugawa Y, Jaberzadeh S, Suppa A, Paulus W, Rothwell J. Plasticity induced by non-invasive transcranial brain stimulation: A position paper. Clin Neurophysiol 2017; 128:2318-2329. [DOI: 10.1016/j.clinph.2017.09.007] [Citation(s) in RCA: 198] [Impact Index Per Article: 28.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2017] [Revised: 08/31/2017] [Accepted: 09/05/2017] [Indexed: 12/11/2022]
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Groiss SJ, Mochizuki H, Hanajima R, Trenado C, Nakatani-Enomoto S, Otani K, Ugawa Y. Impairment of triad conditioned facilitation in amyotrophic lateral sclerosis. Amyotroph Lateral Scler Frontotemporal Degener 2017; 18:604-610. [PMID: 28485644 DOI: 10.1080/21678421.2017.1321676] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
OBJECTIVES The triad conditioned facilitation (TCF) technique has been shown to detect motor cortical intrinsic rhythms depending on the functioning of specific cortical layers by measuring motor evoked potential (MEP) enhancement after a triad of conditioning TMS pulses at a certain interval. However, the influence of cortical degeneration on TCF is still undetermined. We therefore studied TCF in patients with amyotrophic lateral sclerosis (ALS), a neurodegenerative disorder characterised by degeneration of the motor cortex. METHODS Thirteen patients with ALS and 11 age-matched disease control patients with cervical myelopathy (CM) or radiculopathy (CR) participated in the study. We studied short-interval intracortical inhibition (SICI), intracortical facilitation (ICF) and TCF using the paired-pulse and triad conditioned TMS paradigm. RESULTS TCF was significantly reduced in ALS patients compared to CM/CR patients, who had normal TCF. SICI and ICF did not differ between groups. CONCLUSION The absence of TCF with preserved SICI and ICF suggests changes in the intrinsic rhythm generation within the motor cortex due to cortical neurodegeneration in ALS patients. In contrast, TCF was normal in patents with CM/CR in whom the motor cortical intrinsic circuits are not involved. This technique may be valuable to differentiate patients with ALS from those with CM/CR.
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Affiliation(s)
- Stefan J Groiss
- a Department of Neurology, Faculty of Medicine , Fukushima Medical University , Fukushima , Japan.,b Department of Neurology & Institute of Clinical Neuroscience and Medical Psychology, Medical Faculty , Heinrich-Heine-University , Düsseldorf , Germany
| | - Hitoshi Mochizuki
- a Department of Neurology, Faculty of Medicine , Fukushima Medical University , Fukushima , Japan.,c Division of Neurology, Respirology, Endocrinology and Metabolism, Department of Internal Medicine , University of Miyazaki , Miyazaki , Japan
| | - Ritsuko Hanajima
- d Department of Neurology , Kitasato University School of Medicine , Sagamihara , Japan
| | - Carlos Trenado
- b Department of Neurology & Institute of Clinical Neuroscience and Medical Psychology, Medical Faculty , Heinrich-Heine-University , Düsseldorf , Germany
| | - Setsu Nakatani-Enomoto
- a Department of Neurology, Faculty of Medicine , Fukushima Medical University , Fukushima , Japan
| | - Koji Otani
- e Department of Orthopedic Surgery, Faculty of Medicine , Fukushima Medical University , Fukushima , Japan , and
| | - Yoshikazu Ugawa
- a Department of Neurology, Faculty of Medicine , Fukushima Medical University , Fukushima , Japan.,f Neurology , Fukushima Global Medical Science Center, Advanced Clinical Research Center, Fukushima Medical University , Fukushima , Japan
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Parks NA. Concurrent application of TMS and near-infrared optical imaging: methodological considerations and potential artifacts. Front Hum Neurosci 2013; 7:592. [PMID: 24065911 PMCID: PMC3776952 DOI: 10.3389/fnhum.2013.00592] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2013] [Accepted: 09/03/2013] [Indexed: 12/02/2022] Open
Abstract
The simultaneous application of transcranial magnetic stimulation (TMS) with non-invasive neuroimaging provides a powerful method for investigating functional connectivity in the human brain and the causal relationships between areas in distributed brain networks. TMS has been combined with numerous neuroimaging techniques including, electroencephalography (EEG), functional magnetic resonance imaging (fMRI), and positron emission tomography (PET). Recent work has also demonstrated the feasibility and utility of combining TMS with non-invasive near-infrared optical imaging techniques, functional near-infrared spectroscopy (fNIRS) and the event-related optical signal (EROS). Simultaneous TMS and optical imaging affords a number of advantages over other neuroimaging methods but also involves a unique set of methodological challenges and considerations. This paper describes the methodology of concurrently performing optical imaging during the administration of TMS, focusing on experimental design, potential artifacts, and approaches to controlling for these artifacts.
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Affiliation(s)
- Nathan A Parks
- Department of Psychological Science, University of Arkansas Fayetteville, AR, USA
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