Growth of distortion product otoacoustic emissions with primary-tone level in humans.

Abstract:

:This study addressed the hypotheses that the growth of the level of distortion product otoacoustic emissions (LDP) with primary-tone level reflects the behavior of a third-order nonlinear polynomial system, and that two sources exist for these distortion products. The results indicated that the 2f1-f2 otoacoustic emission in humans can be measured over a much larger stimulus range than reported previously, even for stimuli (L1 = L2) as low as 10 dB SPL (re 20 microPa). The input/output functions are best described as a straight line with a rate of growth of about 1 dB/dB of stimulus level. For stimulus levels at which metabolically active, nonlinear cochlear processes are in operation, the system does not behave as a simple third-order nonlinear polynomial. Small plateaus and sharp discontinuities or 'notches' can occur in the functions at stimulus levels of approximately 55 dB SPL. These characteristics are consistent with the notion of two separate sources of the LDP, one at low stimulus levels, and one at high levels. An alternative explanation is that the measured otoacoustic emission does not represent only the activity at a single location along the basilar membrane but includes the effects of interactions among similar signals arising from multiple locations, or from the original source via multiple paths.

journal_name

Hear Res

journal_title

Hearing research

authors

Popelka GR,Osterhammel PA,Nielsen LH,Rasmussen AN

doi

10.1016/0378-5955(93)90016-t

subject

Has Abstract

pub_date

1993-12-01 00:00:00

pages

12-22

issue

1-2

eissn

0378-5955

issn

1878-5891

pii

0378-5955(93)90016-T

journal_volume

71

pub_type

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