Document Detail

Masked auditory thresholds in sciaenid fishes: a comparative study.
MedLine Citation:
PMID:  15478435     Owner:  NLM     Status:  MEDLINE    
Western Atlantic sciaenids comprise a taxonomically diverse teleost family with significant variations in the relationship between the swim bladder and the otic capsule. In this study, the auditory brainstem response (ABR) was used to test the hypothesis that fishes with different peripheral auditory structures (black drum, Pogonias chromis and Atlantic croaker, Micropogonias undulatus) show differences in frequency selectivity. In a black drum the swim bladder is relatively distant from the otic capsule while the swim bladder in Atlantic croaker possesses anteriorly-directed diverticulas that terminate relatively near the otic capsule. Signals were pure tones in the frequency range, 100 Hz to 1.5 kHz, and thresholds were determined both with and without the presence of simultaneous white noise at two intensity levels (124 dB and 136 dB, re: 1 microPa). At the 124 dB level of white noise background, both the black drum and Atlantic croaker showed similar changes in auditory sensitivity. However, in the presence of the 136 dB white noise masker, black drum showed significantly greater shifts in auditory thresholds between 300 and 600 Hz. The results indicate that the two species differ in frequency selectivity since the Atlantic croaker was less susceptible to auditory threshold shifts, particularly at the higher level of masking. This difference may be linked to peripheral auditory mechanisms.
John Ramcharitar; Arthur N Popper
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of the Acoustical Society of America     Volume:  116     ISSN:  0001-4966     ISO Abbreviation:  J. Acoust. Soc. Am.     Publication Date:  2004 Sep 
Date Detail:
Created Date:  2004-10-13     Completed Date:  2005-05-17     Revised Date:  2006-12-27    
Medline Journal Info:
Nlm Unique ID:  7503051     Medline TA:  J Acoust Soc Am     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1687-91     Citation Subset:  IM    
Department of Biology and Neuroscience and Cognitive Science Program, University of Maryland, College Park, Maryland 20742, USA.
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MeSH Terms
Air Sacs / anatomy & histology,  physiology
Analysis of Variance
Audiometry, Evoked Response
Auditory Threshold / physiology*
Ear, Inner / anatomy & histology,  physiology
Evoked Potentials, Auditory, Brain Stem
Noise / adverse effects*
Otolithic Membrane / anatomy & histology,  physiology
Perceptual Masking / physiology*
Perciformes / anatomy & histology,  physiology*

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