Retention of orienting reaction habituation in patients with postmeningoencephalitic epilepsy.

A polygraphic study on habituation of the somatic, autonomic, and EEG components of the orienting reaction elicited by a repetitive auditory stimulus during successive (weekly) sessions was performed in 29 patients with postmeningoencephalic epilepsy (PME) and in 116 control subjects. The study evidence significant retention disturbances of orienting reaction habituation (i.e., of learning), the "saving" of stimulation, achieved from one session to another to obtain the habituation criterion, being lesser in PME patients than in control subjects. The severity of habituation retention disturbances depended on seizure frequency, electroclinical form, and history, as well as a features of EEG tracings.