Reappearance of brain-stem auditory evoked potentials after surgical treatment of a brain-stem hemorrhage: contributions to the question of wave generation

Electrophysiologic auditory tests

“…Wave IV appears to reflect activity predominantly in ascending auditory fibers within the dorsal and rostral pons, just caudal to the inferior colliculus, while wave V predominantly reflects activity at the level of the inferior colliculus, perhaps including activity in the rostral portion of the lateral lemniscus as it terminates in the inferior colliculus (Legatt, 2012). As is the case with wave III, wave V abnormalities due to unilateral brainstem lesions are usually most pronounced following stimulation of the ear ipsilateral to the lesion (Brown et al, 1981;Oh et al, 1981;Faught and Oh, 1985;York, 1986;Scaioli et al, 1988), though there are exceptions (Zanette et al, 1990;Fischer et al, 1995).…”