Right hemisphere partial complex seizures: mania, hallucinations, and speech disturbances during ictal events.

A patient with right hemisphere complex partial seizures exhibited extreme emotional lability resembling mania, neologisms resembling those found in fluent aphasia, and hallucinations during ictal periods. The electroencephalographic and clinical findings in this case suggest that cortical and subcortical structures of the right hemisphere may play a role in mediating the expression of language content.