Document Detail


Two-tone distortion at different longitudinal locations on the basilar membrane.
MedLine Citation:
PMID:  17353104     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
When listening to two tones at frequency f1 and f2 (f2>f1), one can hear pitches not only at f1 and f2 but also at distortion frequencies f2-f1, (n+1)f1-nf2, and (n+1)f2-nf1 (n=1,2,3...). Such two-tone distortion products (DPs) also can be measured in the ear canal using a sensitive microphone. These ear-generated sounds are called otoacoustic emissions (OAEs). In spite of the common applications of OAEs, the mechanisms by which these emissions travel out of the cochlea remain unclear. In a recent study, the basilar membrane (BM) vibration at 2f1-f2 was measured as a function of the longitudinal location, using a scanning laser interferometer. The data indicated a forward traveling wave and no measurable backward wave. However, this study had a relatively high noise floor and high stimulus intensity. In the current study, the noise floor of the BM measurement was significantly decreased by using reflective beads on the BM, and the vibration was measured at relatively low intensities at more than one longitudinal location. The results show that the DP phase at a basal location leads the phase at an apical location. The data indicate that the emission travels along the BM from base to apex as a forward traveling wave, and no backward traveling wave was detected under the current experimental conditions.
Authors:
Wenxuan He; Alfred L Nuttall; Tianying Ren
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2007-02-12
Journal Detail:
Title:  Hearing research     Volume:  228     ISSN:  0378-5955     ISO Abbreviation:  Hear. Res.     Publication Date:  2007 Jun 
Date Detail:
Created Date:  2007-05-04     Completed Date:  2007-07-03     Revised Date:  2014-09-21    
Medline Journal Info:
Nlm Unique ID:  7900445     Medline TA:  Hear Res     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  112-22     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Acoustic Stimulation
Animals
Auditory Threshold
Basilar Membrane / physiology*
Cochlear Microphonic Potentials
Gerbillinae
Interferometry / methods
Otoacoustic Emissions, Spontaneous*
Perceptual Distortion*
Pitch Perception*
Vibration
Grant Support
ID/Acronym/Agency:
R01 DC004554/DC/NIDCD NIH HHS; R01 DC004554-04/DC/NIDCD NIH HHS; R01 DC004554-05/DC/NIDCD NIH HHS; R21 DC006695/DC/NIDCD NIH HHS; R21 DC006695-01/DC/NIDCD NIH HHS
Comments/Corrections

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