Abstract
We observed a stroke patient with an infarct of the internal capsule interrupting the pyramidal tract who stretched his hemiplegic arm during spontaneous and apomorphine-induced yawning. The putative mechanism by which yawning can induce the paradoxical motor response of the plegic arm in the patient might be the functional efficiency of a pathway projecting directly from the stimulated basal ganglia to lower motor systems in the brainstem.
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