title: Free-field audiogram of the Japanese macaque (Macaca fuscata).
abstract: The audiograms of three Japanese macaques and seven humans were determined in a free-field environment using loudspeakers. The monkeys and humans were tested using tones ranging from 8 Hz to 40 kHz and 4 Hz to 22.4 kHz, respectively. At a level of 60 dB sound pressure level the monkeys were able to hear tones extending from 28 Hz to 37 kHz with their best sensitivity of 1 dB occurring at 4 kHz. The human 60-dB hearing range extended from 31 Hz to 17.6 kHz with a best sensitivity of -10 dB at 2 and 4 kHz. These results indicate that the Japanese macaque has low-frequency hearing equal to that of humans and better than that indicated by previous audiograms obtained using headphones.
authors.affiliation: Department of Psychology, University of Toledo, Ohio 43606, USA.
authors.forename: L L
authors.initials: LL
authors.lastname: Jackson
authors.forename: R S
authors.initials: RS
authors.lastname: Heffner
authors.forename: H E
authors.initials: HE
authors.lastname: Heffner
mesh_terms: D000162:Acoustics; D000818:Animals; D001299:Audiometry; D004455:Echolocation / Q000502:physiology*; D006309:Hearing / Q000502:physiology*; D006801:Humans; D008251:Macaca; D008297:Male; D011601:Psychophysics; D013067:Speech Perception / Q000502:physiology*