Document Detail

Loudness perception in the domestic cat: reaction time estimates of equal loudness contours and recruitment effects.
MedLine Citation:
PMID:  19198944     Owner:  NLM     Status:  MEDLINE    
The domestic cat is the primary physiological model of loudness coding and recruitment. At present, there are no published descriptions of loudness perception in this species. This study used a reaction time task to characterize loudness perception in six behaviorally trained cats. The psychophysical approach was based on the assumption that sounds of equal loudness elicit responses of equal latency. The resulting equal latency contours reproduced well-known features of human equal loudness contours. At the completion of normal baseline measures, the cats were exposed to intense sound to investigate the behavioral correlates of loudness recruitment, the abnormally rapid growth of loudness that is commonly associated with hearing loss. Observed recruitment effects were similar in magnitude to those that have been reported in hearing-impaired humans. Linear hearing aid amplification is known to improve speech intelligibility but also exacerbate recruitment in impaired listeners. The effects of speech spectra and amplification on recruitment were explored by measuring the growth of loudness for natural and amplified vowels before and after sound exposure. Vowels produced more recruitment than tones, and the effect was exacerbated by the selective amplification of formant structure. These findings support the adequacy of the domestic cat as a model system for future investigations of the auditory processes that underlie loudness perception, recruitment, and hearing aid design.
Bradford J May; Nicole Little; Stephanie Saylor
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2009-02-07
Journal Detail:
Title:  Journal of the Association for Research in Otolaryngology : JARO     Volume:  10     ISSN:  1438-7573     ISO Abbreviation:  J. Assoc. Res. Otolaryngol.     Publication Date:  2009 Jun 
Date Detail:
Created Date:  2009-04-28     Completed Date:  2009-07-15     Revised Date:  2013-06-02    
Medline Journal Info:
Nlm Unique ID:  100892857     Medline TA:  J Assoc Res Otolaryngol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  295-308     Citation Subset:  IM    
Center for Hearing and Balance, Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University School of Medicine, Traylor Research Building, Room 521, 720 Rutland Avenue, Baltimore, MD 21205, USA.
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MeSH Terms
Acoustic Stimulation
Auditory Threshold
Hearing / physiology
Hearing Aids
Loudness Perception / physiology*
Models, Animal
Reaction Time*
Speech Perception
Grant Support

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

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