Somatosensory evoked magnetic fields and potentials following passive toe movement in humans |
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| Institution: | 1. Ohio Musculoskeletal and Neurological Institute, Ohio University, Athens, OH, USA;2. School of Health and Rehabilitation Sciences, The Ohio State University, Columbus, OH, USA;3. Division of Athletic Training, School of Applied Health Sciences and Wellness, College of Health Sciences and Professions, Ohio University, Athens, OH, USA;4. Translational Biomedical Sciences Program, Graduate College, Ohio University, Athens, OH, USA;5. Heritage College of Osteopathic Medicine, Athens, OH, USA;1. Department of Biomedical Engineering, Marquette University and Medical College of Wisconsin, Milwaukee, WI, USA;2. Clinical Translational Science Institute, Medical College of Wisconsin, Milwaukee, WI, USA;3. McLean Hospital, Department of Psychiatry, Harvard Medical School, Boston, MA, USA;1. Department of Radiology, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada;2. Department of Neuroscience, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada;3. Child and Adolescent Imaging Research (CAIR) Program, University of Calgary, Calgary, Alberta, Canada;4. Alberta Children’s Hospital Research Institute, University of Calgary, Calgary, Alberta, Canada;5. Hotchkiss Brain Institute, University of Calgary, Calgary, Alberta, Canada;1. Biomedical Translational Imaging Centre (BIOTIC), IWK Health Sciences Centre, Halifax, Nova Scotia, Canada;2. Department of Diagnostic Imaging, IWK Health Sciences Centre, Halifax, Nova Scotia, Canada;3. Laboratory for Brain Recovery and Function, School of Physiotherapy, Dalhousie University, Halifax, Nova Scotia, Canada;4. Department of Computer Sciences, Dalhousie University, Halifax, Nova Scotia, Canada;1. Neuroscience Program and Biomedical Engineering Laboratory, University of São Paulo, EP-USP, PTC, São Paulo, Brazil;2. Division of Neurology, Federal University of São Paulo, São Paulo, Brazil;3. Institute of Physical Activity and Sport Sciences and Graduate Program in Human Movement Sciences, Cruzeiro do Sul University, São Paulo, Brazil;4. Institute of Bioscience, São Paulo State University, Rio Claro, Brazil |
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| Abstract: | The somatosensory evoked magnetic fields (SEFs) and evoked potentials (SEPs) following passive toe movement were studied in 10 normal subjects. Five main components were identified in SEFs recorded around the vertex around the foot area of the primary sensory cortex (SI). The first and second components, 1M and 2M, were identified at approximately 35 and 46 ms. Equivalent current dipoles (ECDs) of both 1M and 2M were estimated around SI in the hemisphere contralateral to the movement toe, and were probably generated in area 3a or area 2, which mainly receive inputs ascending through muscle and joint afferents. The large inter-individual difference of 1M and 2M in terms of ECD orientation was probably due to a large anatomical variance of the foot area of SI. The third and fourth components, 3M and 4M, were identified at approximately 62 ms and 87 ms, respectively. They appeared to be a single large long-duration component with two peaks. Since the 3M and 4M components were significantly larger than the 1M and 2M components in amplitude and their ECD location was significantly superior to that of 1M and 2M, we suspected that they were generated in different sites from those of 1M and 2M, probably area 3b or area 4. Four components, 1E, 2E, 3E and 4E, were identified in SEPs, which appeared to correspond to 1M, 2M, 3M and 4M, respectively. The variation observed in the scalp distribution of the primary component, 1E, could be accounted for by the variation of the orientation of ECD of the 1M component. There was a large difference in the waveform of the long-latency component (longer than 100 ms) between SEFs and SEPs. The 5E of SEPs was a large amplitude component, but the 5M of SEFs was small or absent. We speculate that this long-latency component was generated by multiple generators. |
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