Distortion product otoacoustic emissions in Macaca mulatta and humans. Hear Res 1995 Sep;89(1-2):35-51
Date
09/01/1995Pubmed ID
8600131DOI
10.1016/0378-5955(95)00120-1Scopus ID
2-s2.0-0028884378 (requires institutional sign-in at Scopus site) 20 CitationsAbstract
Distortion product otoacoustic emissions (DPOAEs) were compared in eight rhesus monkeys (Macaca mulatta) and eight normal hearing humans. DPOAEs were recorded in three conditions. In the first condition, DPOAEgrams were generated for monkeys and humans from approximately f2 = 0.5-20 kHz. Monkeys had larger amplitude DPOAEs at all frequencies except around f2 = 1 kHz. In the second condition, DPOAE amplitudes increased and then decreased as the separation between the primaries increased. These functions were similar in the two species except at the lowest frequencies assessed. In the third condition, the levels of the primaries were varied independently. Monkeys had steeper input/output (I/O) functions than humans. The slopes of DPOAE I/O functions increased with frequency in both species. When the levels of both primaries were increased simultaneously, DPOAE I/O functions were well described by power functions throughout the intensity range assessed (from threshold to 65 dB SPL). Monkey I/O functions tended to be expansive power functions at all but the lowest frequencies, while human I/O functions tended to be compressive power functions except at the highest frequencies assessed. Other differences in I/O functions f2 = 8 kHz may indicate species specific differences at high (for human) frequencies.
Author List
Lasky RE, Snodgrass EB, Laughlin NK, Hecox KEMESH terms used to index this publication - Major topics in bold
Acoustic StimulationAdult
Animals
Female
Humans
Linear Models
Macaca mulatta
Male
Otoacoustic Emissions, Spontaneous
Species Specificity
