Physiological studies of the corticomotor projection to the hand after subcortical stroke


Byrnes, M. L., Thickbroom, G W., Phillips, B. A., Wilson, S. A. and Mastaglia, F. L.. 1999. "Physiological studies of the corticomotor projection to the hand after subcortical stroke." Clinical Neurophysiology. 110 (3), pp. 487-498.
Article Title

Physiological studies of the corticomotor projection to the hand after subcortical stroke

ERA Journal ID15933
Article CategoryArticle
AuthorsByrnes, M. L. (Author), Thickbroom, G W. (Author), Phillips, B. A. (Author), Wilson, S. A. (Author) and Mastaglia, F. L. (Author)
Journal TitleClinical Neurophysiology
Journal Citation110 (3), pp. 487-498
Number of Pages12
Place of PublicationAmsterdam, Netherlands
Digital Object Identifier (DOI)

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.

Keywordsmagnetic stimulation; brain mapping; recovery; stroke
ANZSRC Field of Research 2020320907. Sensory systems
320199. Cardiovascular medicine and haematology not elsewhere classified
320899. Medical physiology not elsewhere classified
Byline AffiliationsUniversity of Western Australia
Institution of OriginUniversity of Southern Queensland
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