Document Detail


Phase effects in masking by harmonic complexes in birds.
MedLine Citation:
PMID:  16521786     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Masking by harmonic complexes depends on the frequency content of the masker and its phase spectrum. Harmonic complexes created with negative Schroeder phases (component phases decreasing with increasing frequency) produce more masking than those with positive Schroeder phases (increasing phase) in humans, but not in birds. The masking differences in humans have been attributed to interactions between the masker phase spectrum and the phase characteristic of the basilar membrane. In birds, the similarity in masking by positive and negative Schroeder maskers, and reduced masking by cosine-phase maskers (constant phase), suggests a phase characteristic that does not change much along the basilar papilla. To evaluate this possibility, the rate of phase change across masker bandwidth was varied by systematically altering the Schroeder algorithm. Humans and three species of birds detected tones added in phase to a single component of a harmonic complex. As observed in earlier studies, the minimum amount of masking in humans occurred for positive phase gradients. However, minimum masking in birds occurred for a shallow negative phase gradient. These results suggest a cochlear delay in birds that is reduced compared to that found in humans, probably related to the shorter avian basilar epithelia.
Authors:
Amanda M Lauer; Robert J Dooling; Marjorie R Leek; Jennifer J Lentz
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural    
Journal Detail:
Title:  The Journal of the Acoustical Society of America     Volume:  119     ISSN:  0001-4966     ISO Abbreviation:  J. Acoust. Soc. Am.     Publication Date:  2006 Feb 
Date Detail:
Created Date:  2006-03-08     Completed Date:  2006-12-29     Revised Date:  2013-09-20    
Medline Journal Info:
Nlm Unique ID:  7503051     Medline TA:  J Acoust Soc Am     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1251-9     Citation Subset:  IM    
Affiliation:
Department of Psychology, University of Maryland, College Park, Maryland 20742, USA. alauer@psyc.umd.edu
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MeSH Terms
Descriptor/Qualifier:
Acoustic Stimulation / methods
Animals
Auditory Threshold / physiology*
Canaries / physiology*
Cochlea / physiology
Finches / physiology*
Humans
Melopsittacus / physiology*
Noise / adverse effects
Organ of Corti / physiology*
Perceptual Masking / physiology*
Vocalization, Animal / physiology
Grant Support
ID/Acronym/Agency:
DC-005450/DC/NIDCD NIH HHS; DC-00626/DC/NIDCD NIH HHS; DC-01372/DC/NIDCD NIH HHS; DC-04664-01A2/DC/NIDCD NIH HHS; F31 DC005450/DC/NIDCD NIH HHS
Comments/Corrections

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