Corpus Callosotomy

This procedure causes an iatrogenic lesion and is undertaken in an effort to control intractable epilepsy. The rationale is that seizures that begin in one hemisphere can be contained therein by severing the callosal connections to the other hemisphere. Because naturally occurring lesions of the corpus callosum are uncommon, these patients have provided a source of investigation for callosal function. In general, the effects of such a dramatic procedure are surprisingly inapparent, and patients function relatively normally. The "unity of consciousness" is well integrated despite the two halves of the brain being anatomically separated. However, detailed testing may reveal callosal deficits, such as left unilateral ideomotor apraxia, agraphia, hemialexia, and tactile anomia.

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