| Characterizing distortion-product otoacoustic emission components across four species. | |
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MedLine Citation:
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PMID: 21568412 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Distortion-product otoacoustic emissions (DPOAEs) were measured as level/phase (L/P) maps in humans, rabbits, chinchillas, and rats with and without an interference tone (IT) placed either near the 2f(1)-f(2) DPOAE frequency place (f(dp)) or at one-third of an octave above the f(2) primary tone (1/3-oct IT). Vector differences between with and without IT conditions were computed to derive a residual composed of the DPOAE components removed by the IT. In humans, a DPOAE component could be extracted with the expected steep phase gradient indicative of reflection emissions by ITs near f(dp). In the laboratory species, ITs near f(dp) failed to produce any conclusive evidence for reflection components. For all species, 1/3-oct ITs extracted large DPOAE components presumably generated at or basal to the IT-frequency place that exhibited both distortion- and reflection-like phase properties. Together, these findings suggested that basal distortion components could assume reflection-like phase behavior when the assumptions of cochlear-scaling symmetry, the basis for shallow phase gradients for constant f(2)/f(1) ratio sweeps, are violated. The present results contradict the common belief that DPOAE components associated with steep or shallow phase slopes are unique signatures for reflection emissions arising from f(dp) or distortion emissions generated near f(2), respectively. |
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Authors:
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Glen K Martin; Barden B Stagner; You Sun Chung; Brenda L Lonsbury-Martin |
Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: The Journal of the Acoustical Society of America Volume: 129 ISSN: 1520-8524 ISO Abbreviation: J. Acoust. Soc. Am. Publication Date: 2011 May |
Date Detail:
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Created Date: 2011-05-16 Completed Date: 2011-09-12 Revised Date: 2012-05-01 |
Medline Journal Info:
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Nlm Unique ID: 7503051 Medline TA: J Acoust Soc Am Country: United States |
Other Details:
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Languages: eng Pagination: 3090-103 Citation Subset: IM |
Affiliation:
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Research Service, VA Loma Linda Healthcare System and Department of Otolaryngology-Head and Neck Surgery, Loma Linda University Medical Center, Loma Linda, California 92357, USA. glen.martin2@va.gov |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Chinchilla / physiology* Ear Canal Female Humans Male Manometry Nonlinear Dynamics Otoacoustic Emissions, Spontaneous / physiology* Perceptual Distortion / physiology* Pressure Rabbits / physiology* Rats / physiology* Species Specificity |
| Grant Support | |
ID/Acronym/Agency:
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DC000613/DC/NIDCD NIH HHS; R01 DC000613-24/DC/NIDCD NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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