Hearing Loss in the Rhesus Monkey after Repeated Exposures to Identical Noises

摘要

The experiment is the first in a series studying hearing loss in monkeys. Five animals were exposed to repeated single-pulse noises alternately at 72- and 96-hour intervals, to observe inter-subject and intra-subject variations in hearing behavior under similar physical-noise conditions. Audiograms were taken periodically, from two minutes after exposure to 72 hours later, for 2 and 4 kc test tones. There were distinctive differences in individual-animal patterns of hearing loss and recovery. Two animals clearly showed smaller hearing losses during the later exposure sessions, and that loss phenomenon is discussed. (Author)