Document Detail

Assessment of the role of the cochlear latency effect in lateralization of click sounds in humans.
MedLine Citation:
PMID:  19470129     Owner:  NLM     Status:  MEDLINE    
Interaural time and intensity disparities (ITD and IID) are the two cues to sound lateralization. "Time-only" hypothesis claims that an IID is first converted to an interaural afferent delay (Delta t), and is then processed by the central ITD mechanism, rendering a separate IID processor unnecessary. We tested this hypothesis by assessing the contribution of the cochlear latency effect to the psychophysical ITD/IID trading ratio. Auditory brainstem responses (ABRs) were used to measure the interaural afferent delays (Delta ts) that developed with a 20/sec dichotic click train used in the trading experiment. Except for small IIDs at low loudness levels, the physiological Delta t delay produced by an IID was significantly smaller than the ITD psychophysically traded for the same IID. We concluded that the cochlear latency effect alone cannot explain the psychophysical ITD/IID trading ratios and a separate IID mechanism must be involved.
Bülent Ozmen; Pekcan Ungan
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-05-12
Journal Detail:
Title:  Psychophysiology     Volume:  46     ISSN:  1540-5958     ISO Abbreviation:  Psychophysiology     Publication Date:  2009 Jul 
Date Detail:
Created Date:  2009-07-07     Completed Date:  2009-09-16     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0142657     Medline TA:  Psychophysiology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  797-806     Citation Subset:  IM    
Department of Biophysics, Faculty of Medicine, Hacettepe University, Ankara, Turkey.
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MeSH Terms
Acoustic Stimulation
Analysis of Variance
Cochlea / physiology*
Data Interpretation, Statistical
Functional Laterality / physiology*
Psychomotor Performance / physiology

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