LATENCY AND MULTIPLE SOURCES OF DISTORTION-PRODUCT OTOACOUSTIC EMISSIONS

Citation
Lj. Stover et al., LATENCY AND MULTIPLE SOURCES OF DISTORTION-PRODUCT OTOACOUSTIC EMISSIONS, The Journal of the Acoustical Society of America, 99(2), 1996, pp. 1016-1024
Citations number
36
Categorie Soggetti
Acoustics
ISSN journal
00014966
Volume
99
Issue
2
Year of publication
1996
Pages
1016 - 1024
Database
ISI
SICI code
0001-4966(1996)99:2<1016:LAMSOD>2.0.ZU;2-L
Abstract
A novel analysis approach has been developed to examine the latency of distortion product otoacoustic emissions (DPOAEs). DPOAEs were measur ed in ten normal-hearing adults in a paradigm in which f(2) was held c onstant and f(1) was varied. This paradigm was used with a wide range of primary levels. Latency was estimated in two ways. In the first, a phase-slope delay measurement was used which showed a significant resp onse latency increase as stimulus intensity was decreased. In the seco nd approach, an inverse-FFT procedure was used to provide a temporal a nalysis of the data. Results of this analysis reveal a complex latency structure with multiple peaks in the envelope of the time waveform. T he latencies of individual peaks remain constant across level, however short latency peaks have the greatest amplitudes at higher levels, an d longer latency peaks are largest at low levels. These results would be consistent with the idea that there are multiple intracochlear sour ces for distortion product generation; however, a simple model, in whi ch generation is assigned to the f(2) and the 2f(1)-f(2) place, does n ot adequately explain the number of envelope peaks that were present i n many ears. (C) 1996 Acoustical Society of America.