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Abstract

Averaged responses evoked by tone-bursts were investigated in the alert, anesthetized, and sedated Rhesus monkey. Identified were a short latency (peak 13.5 msec) triphasic extracranial response and a longer latency (P1 38 msec, N1 93 msec, P2 152 msec, N2 199 msec) polyphasic intracranial response. The early and late components of the intracranial response seemed to originate in different auditory centers. It was concluded that, with intracranially implanted electrodes, determining averaged response thresholds for tone-bursts in the monkey sedated with phencyclidine hydrochloride is a reasonably accurate method of estimating behavioral thresholds of hearing.