Physiological studies of the corticomotor projection to the hand after subcortical stroke
Article
Article Title | Physiological studies of the corticomotor projection to the hand after subcortical stroke |
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ERA Journal ID | 15933 |
Article Category | Article |
Authors | Byrnes, M. L. (Author), Thickbroom, G W. (Author), Phillips, B. A. (Author), Wilson, S. A. (Author) and Mastaglia, F. L. (Author) |
Journal Title | Clinical Neurophysiology |
Journal Citation | 110 (3), pp. 487-498 |
Number of Pages | 12 |
Year | 1999 |
Place of Publication | Amsterdam, Netherlands |
ISSN | 1388-2457 |
1872-8952 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/S1388-2457(98)00044-3 |
Abstract | Objective: The mechanisms which lead to recovery of motor function after a stroke are poorly understood. Functional reorganization of cortical motor centres is thought to be one of the factors which may contribute to recovery. We have investigated the extent of reorganization which occurs at the level of the primary motor cortex after a lesion of the corticospinal pathway. Methods: Transcranial magnetic stimulation was used to map the topography of the primary corticomotor projection to the abductor pollicis brevis muscle and study changes in cortical motor thresholds and corticospinal conduction in a group of 20 subjects with subcortical infarcts of varying duration (1 week to 15 years) and varying degrees of motor deficit. Results: There was a broad correlation between motor evoked potential (MEP) amplitude and motor thresholds on the one hand and the severity of motor deficit and site and extent of the lesion on the other. Shifts in the cortical motor maps were found in both early and late cases, irrespective of the site of the lesion, but were more frequent in the longer standing cases. Shifts were usually along the mediolateral axis but anteroposterior shifts were found in some late cases. Conclusion: Our findings indicate that there is functional reorganization of the corticomotor projection in subjects who regain a degree of motor control following a subcortical lesion sparing the motor cortex. |
Keywords | magnetic stimulation; brain mapping; recovery; stroke |
ANZSRC Field of Research 2020 | 320907. Sensory systems |
320199. Cardiovascular medicine and haematology not elsewhere classified | |
320899. Medical physiology not elsewhere classified | |
Byline Affiliations | University of Western Australia |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q05z4/physiological-studies-of-the-corticomotor-projection-to-the-hand-after-subcortical-stroke
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