Document Detail

Auditory nerve frequency tuning measured with forward-masked compound action potentials.
MedLine Citation:
PMID:  22948475     Owner:  NLM     Status:  MEDLINE    
Frequency selectivity is a fundamental cochlear property. Recent studies using otoacoustic emissions and psychophysical forward masking suggest that frequency selectivity is sharper in human than in common laboratory species. This has been disputed based on reports using compound action potentials (CAPs), which reflect activity in the auditory nerve and can be measured in humans. Comparative data of CAPs, obtained with a variety of simultaneous masking protocols, have been interpreted to indicate similarity of frequency tuning across mammals and even birds. Unfortunately, there are several issues with the available CAP measurements which hamper a straightforward comparison across species. We investigate sharpness of CAP tuning in cat and chinchilla using a forward masking notched-noise paradigm--which is less confounded by cochlear nonlinearities than simultaneous masking paradigms and similar to what was used in the psychophysical study reporting sharper tuning in humans. Our parametric study, using different probe frequencies and notch widths, shows relationships consistent with those of auditory nerve fibers (ANFs). The sharpness of tuning, quantified by Q(10) factors, is negatively correlated with probe level and increases with probe frequency, but the Q(10) values are generally lower than the average trend for ANFs. Like the single fiber data, tuning for CAPs is sharper in cat than in chinchilla, but the two species are similar in the dependence of tuning on probe frequency and in the relationship between tuning in ANFs and CAP. Growth-of-maskability functions show slopes <1 indicating that with increasing probe level the probe is more susceptible to cochlear compression than the masker. The results support the use of forward-masked CAPs as an alternative measure to estimate ANF tuning and to compare frequency tuning across species.
Eric Verschooten; Luis Robles; Damir Kovačić; Philip X Joris
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-09-05
Journal Detail:
Title:  Journal of the Association for Research in Otolaryngology : JARO     Volume:  13     ISSN:  1438-7573     ISO Abbreviation:  J. Assoc. Res. Otolaryngol.     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-11-26     Completed Date:  2013-07-22     Revised Date:  2013-12-05    
Medline Journal Info:
Nlm Unique ID:  100892857     Medline TA:  J Assoc Res Otolaryngol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  799-817     Citation Subset:  IM    
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MeSH Terms
Action Potentials*
Cochlea / physiology
Cochlear Nerve / physiology*
Nerve Fibers / physiology
Species Specificity

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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