[Early, middle-latency and late auditory evoked potentials in a case of acquired epileptic aphasia (Landau-Kleffner syndrome)].

The authors report the case of a girl whose development was normal until the age of eleven when epileptic seizures occurred. These were followed by loss of speech and auditory agnosia. The diagnosis of Landau-Kleffner syndrome was mode. The study of the auditory evoked response showed normal function of ear and brainstem auditory relays. On the other hand, the amplitude of the middle latency and late cortical responses were decreased. The relationship between these electrophysiological abnormalities and auditory agnosia are discussed.