Released involuntary laughter after temporal lobe infarction

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Abstract
A case of sustained involuntary laughter is described, with accompanying alteration of mood, due to infarction of the inferior and lateral aspects of the left temporal lobe. The lesion was localized by the clinical findings, by electroencephalography, by a radioisotope brain scan, and by angiography. The problem of the neurology of emotional behaviour is discussed in the context of the localization of the lesion in this case.