Latency and multiple sources of distortion product otoacoustic emissions

Research output: Contribution to journalArticle

86 Citations (Scopus)

Abstract

A novel analysis approach has been developed to examine the latency of distortion product otoacoustic emissions (DPOAEs). DPOAEs were measured in ten normal-hearing adults in a paradigm in which f2 was held constant and f1 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 response latency increase as stimulus intensity was decreased. In the second approach, an inverse-FFT procedure was used to provide a temporal analysis of the data. Results of this analysis reveal a complex latency structure with multiple peaks in the envelope of the lime waveform. The latencies of individual peaks remain constant across level, however short latency peaks have the greatest amplitudes at higher levels, and longer latency peaks are largest at low levels. These results would be consistent with the idea that there are multiple intracochlear sources for distortion product generation; however, a simple model, in which generation is assigned to the f2 and the 2f1-f2 place, does not adequately explain the number of envelope peaks that were present in many ears.

Original languageEnglish (US)
Pages (from-to)1016-1024
Number of pages9
JournalJournal of the Acoustical Society of America
Volume99
Issue number2
DOIs
StatePublished - Feb 1 1996

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products
envelopes
fast Fourier transformations
ear
calcium oxides
hearing
stimuli
waveforms
Latency
slopes
Paradigm

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics

Cite this

Latency and multiple sources of distortion product otoacoustic emissions. / Stover, Lisa J.; Neely, Stephen T; Gorga, Michael P.

In: Journal of the Acoustical Society of America, Vol. 99, No. 2, 01.02.1996, p. 1016-1024.

Research output: Contribution to journalArticle

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