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Abstract
The purpose of this study was to compare multifre-quency tympanometry and otoacoustic emissions (OAEs) in rhesus monkeys (Macaca mulatto) and humans. Tympanometry and OAEs can be recorded efficiently in Macaca mulatta to assess peripheral auditory function with results comparable to those in humans. Differences include (1) greater admittances and conductances in humans from 226 to 630 Hz, the frequency range validly assessed; (2) larger amplitude transient evoked OAEs (TEOAEs) and noise levels in humans; (3) larger amplitude monkey 2ft—f2 distortion product OAEs (DPOAES) (f2s<2 kHz); (4) more prominent DPOAEs other than 2f1-f2 in monkeys; (5) more narrowly tuned human f2/fl X 2f]-f2 amplitude functions at the lower frequencies tested; and (6) lower 2f,-f2 DPOAE thresholds at f2=0.5 kHz and ⩾ 8 kHz in monkeys.