Document Detail

Comodulation detection differences in the hooded crow (Corvus corone cornix), with direct comparison to human subjects.
MedLine Citation:
PMID:  17407915     Owner:  NLM     Status:  MEDLINE    
Envelope modulations have been shown important in determining the effectiveness of masking noises. For example, the threshold for detecting a signal flanked by maskers is lower if the maskers and the signal are modulated with different envelopes, rather than the same envelope (comodulation). This threshold change is called the comodulation detection difference (CDD). CDDs were studied in two wild-caught hooded crows, using a 1.5 kHz signal and two maskers at 0.9 and 2.1 kHz, presented at an overall level of 55 dB SPL (re 20 microPa). For direct comparison with human psychophysics, three human subjects were tested in the same setup. CDDs averaged 15 dB for the two crow subjects and 11 dB for the human subjects. The species difference between average CDDs was insignificant. The significance of the CDD effect in a natural setting is discussed.
Kenneth Kragh Jensen
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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:  121     ISSN:  0001-4966     ISO Abbreviation:  J. Acoust. Soc. Am.     Publication Date:  2007 Mar 
Date Detail:
Created Date:  2007-04-05     Completed Date:  2007-05-01     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7503051     Medline TA:  J Acoust Soc Am     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1783-9     Citation Subset:  IM    
Institute of Biology, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark.
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MeSH Terms
Animal Communication*
Auditory Threshold
Crows / physiology*
Perceptual Masking

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