Evidence for a bipolar change in distortion product otoacoustic emissions during contralateral acoustic stimulation in humans

2005 ◽  
Vol 118 (6) ◽  
pp. 3747-3756 ◽  
Author(s):  
Jörg Müller ◽  
Thomas Janssen ◽  
Guido Heppelmann ◽  
Wolfgang Wagner
Keyword(s):  
Otoacoustic Emissions ◽  
Acoustic Stimulation ◽  
Distortion Product Otoacoustic Emissions ◽  
Distortion Product ◽  
Contralateral Acoustic Stimulation

Contralateral Acoustic Stimulation Modulates Low-Frequency Biasing of DPOAE: Efferent Influence on Cochlear Amplifier Operating State?

2009 ◽  
Vol 101 (5) ◽  
pp. 2362-2371 ◽  
Author(s):  
Cornelius Abel ◽  
Anna Wittekindt ◽  
Manfred Kössl
Keyword(s):  
Otoacoustic Emissions ◽  
Low Frequency ◽  
Acoustic Stimulation ◽  
Operating Point ◽  
Cochlear Amplifier ◽  
Contralateral Noise ◽  
Distortion Product ◽  
Contralateral Acoustic Stimulation ◽  
Olivocochlear System ◽  
Cas A

The mammalian efferent medial olivocochlear system modulates active amplification of low-level sounds in the cochlea. Changes of the cochlear amplifier can be monitored by distortion product otoacoustic emissions (DPOAEs). The quadratic distortion product f2–f1 is known to be sensitive to changes in the operating point of the amplifier transfer function. We investigated the effect of contralateral acoustic stimulation (CAS), known to elicit efferent activity, on DPOAEs in the gerbil. During CAS, a significant increase of the f2–f1 level occurred already at low contralateral noise levels (20 dB SPL), whereas 2f1–f2 was much less affected. The effect strength depended on the CAS level and as shown in experiments with pure tones on the frequency of the contralateral stimulus. In a second approach, we biased the position of the cochlear partition and thus the cochlear amplifier operating point periodically by a ipsilateral low-frequency tone, which resulted in a phase-related amplitude modulation of f2–f1. This modulation pattern was changed considerably during contralateral noise stimulation, in dependence on the noise level. The experimental results were in good agreement with a simple model of distortion product generation and suggest that the olivocochlear efferents might change the operating state of cochlear amplification.

Relationship Between Distortion Product Otoacoustic Emissions and Hearing Loss

2006 ◽  
Vol 2 (1) ◽  
pp. 2-9
Author(s):  
Tiffany A. Johnson ◽  
Stephen T. Neely ◽  
Michael P. Gorga
Keyword(s):  
Hearing Loss ◽  
Otoacoustic Emissions ◽  
Distortion Product Otoacoustic Emissions ◽  
Distortion Product

Distortion product otoacoustic emissions upon ear canal pressurization

2013 ◽  
Vol 133 (4) ◽  
pp. EL331-EL337 ◽  
Author(s):  
Makram Zebian ◽  
Volker Schirkonyer ◽  
Johannes Hensel ◽  
Sven Vollbort ◽  
Thomas Fedtke ◽  
...  
Keyword(s):  
Otoacoustic Emissions ◽  
Distortion Product Otoacoustic Emissions ◽  
Ear Canal ◽  
Distortion Product

Dependence of distortion‐product otoacoustic emissions on primary levels in normal and impaired ears. II. Asymmetry in L1,L2 space

1995 ◽  
Vol 97 (4) ◽  
pp. 2359-2377 ◽  
Author(s):  
M. L. Whitehead ◽  
B. B. Stagner ◽  
M. J. McCoy ◽  
B. L. Lonsbury‐Martin ◽  
G. K. Martin
Keyword(s):  
Otoacoustic Emissions ◽  
Distortion Product Otoacoustic Emissions ◽  
Distortion Product
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