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Journal of the Association for Research in Otolaryngology

Published in:

01-06-2011

Isoresponse Versus Isoinput Estimates of Cochlear Filter Tuning

Authors: Almudena Eustaquio-Martín, Enrique A. Lopez-Poveda

Published in: Journal of the Association for Research in Otolaryngology | Issue 3/2011

Abstract

The tuning of a linear filter may be inferred from the filter’s isoresponse (e.g., tuning curves) or isoinput (e.g., isolevel curves) characteristics. This paper provides a theoretical demonstration that for nonlinear filters with compressive response characteristics like those of the basilar membrane, isoresponse measures can suggest strikingly sharper tuning than isoinput measures. The practical significance of this phenomenon is demonstrated by inferring the 3-dB-down bandwidths (BW_3dB) of human auditory filters at 500 and 4,000 Hz from behavioral isoresponse and isoinput measures obtained with sinusoidal and notched noise forward maskers. Inferred cochlear responses were compressive for the two types of maskers. Consistent with expectations, low-level BW_3dB estimates obtained from isoresponse conditions were considerably narrower than those obtained from isolevel conditions: 69 vs. 174 Hz, respectively, at 500 Hz, and 280 vs. 464 Hz, respectively, at 4,000 Hz. Furthermore, isoresponse BW_3dB decreased with increasing level while corresponding isolevel estimates remained approximately constant at 500 Hz or increased slightly at 4 kHz. It is suggested that comparisons between isoresponse supra-threshold human tuning and threshold animal neural tuning should be made with caution.

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Title: Isoresponse Versus Isoinput Estimates of Cochlear Filter Tuning
Authors: Almudena Eustaquio-Martín
Enrique A. Lopez-Poveda
Publication date: 01-06-2011
Publisher: Springer-Verlag
Published in: Journal of the Association for Research in Otolaryngology / Issue 3/2011
Print ISSN: 1525-3961
Electronic ISSN: 1438-7573
DOI: https://doi.org/10.1007/s10162-010-0252-1

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