Document Detail

The effects of temporal asymmetry on the detection and perception of short chirps.
MedLine Citation:
PMID:  11506939     Owner:  NLM     Status:  MEDLINE    
There is an intriguing contrast between the physiological response to short frequency sweeps in the brainstem and the perception produced by these sounds. Dau et al. (2000) demonstrated that optimised chirps with increasing instantaneous frequency (up-chirps), designed to compensate for spatial dispersion along the cochlea, enhance wave V of the auditory brainstem response (ABR), by synchronising excitation of all frequency channels across the basilar membrane. Down-chirps, that is up-chirps reversed in time, increase cochlear phase delays and therefore result in a poor ABR wave V. In this study, a set of psychoacoustical experiments with up-chirps and down-chirps has been performed to investigate how these phase changes affect what we hear. The perceptual contrast is different from what was reported at the brainstem level. It is the down-chirp that sounds more compact, despite the poor synchronisation across channels and phase delays up to 20 ms. The perceived 'compactness' of a sound is apparently more determined by the fine structure of excitation within each peripheral channel than by between-channel phase differences. This suggests an additional temporal integration mechanism at a higher stage of auditory processing, which effectively removes phase differences between channels.
S Uppenkamp; S Fobel; R D Patterson
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Hearing research     Volume:  158     ISSN:  0378-5955     ISO Abbreviation:  Hear. Res.     Publication Date:  2001 Aug 
Date Detail:
Created Date:  2001-08-16     Completed Date:  2001-10-25     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7900445     Medline TA:  Hear Res     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  71-83     Citation Subset:  IM    
entre for the Basis of Hearing, Department of Physiology, University of Cambridge, UK.
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MeSH Terms
Acoustic Stimulation / methods
Auditory Perception / physiology*
Auditory Threshold
Cochlea / physiology*
Evoked Potentials, Auditory, Brain Stem / physiology
Hearing / physiology*
Perceptual Masking
Time Factors

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

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