Document Detail


Integration of monaural and binaural evidence of vowel formants.
MedLine Citation:
PMID:  10875384     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The intelligibility of speech is sustained at lower signal-to-noise ratios when the speech has a different interaural configuration from the noise. This paper argues that the advantage arises in part because listeners combine evidence of the spectrum of speech in the across-frequency profile of interaural decorrelation with evidence in the across-frequency profile of intensity. To support the argument, three experiments examined the ability of listeners to integrate and segregate evidence of vowel formants in these two profiles. In experiment 1, listeners achieved accurate identification of the members of a small set of vowels whose first formant was defined by a peak in one profile and whose second formant was defined by a peak in the other profile. This result demonstrates that integration is possible. Experiment 2 demonstrated that integration is not mandatory, insofar as listeners could report the identity of a vowel defined entirely in one profile despite the presence of a competing vowel in the other profile. The presence of the competing vowel reduced accuracy of identification, however, showing that segregation was incomplete. Experiment 3 demonstrated that segregation of the binaural vowel, in particular, can be increased by the introduction of an onset asynchrony between the competing vowels. The results of experiments 2 and 3 show that the intrinsic cues for segregation of the profiles are relatively weak. Overall, the results are compatible with the argument that listeners can integrate evidence of spectral peaks from the two profiles.
Authors:
M A Akeroyd; A Q Summerfield
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of the Acoustical Society of America     Volume:  107     ISSN:  0001-4966     ISO Abbreviation:  J. Acoust. Soc. Am.     Publication Date:  2000 Jun 
Date Detail:
Created Date:  2000-08-15     Completed Date:  2000-08-15     Revised Date:  2006-12-27    
Medline Journal Info:
Nlm Unique ID:  7503051     Medline TA:  J Acoust Soc Am     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  3394-406     Citation Subset:  IM    
Affiliation:
MRC Institute of Hearing Research, University Park, Nottingham, United Kingdom. michael@neuron.uchc.edu
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MeSH Terms
Descriptor/Qualifier:
Adult
Auditory Threshold / physiology
Hearing / physiology
Humans
Models, Biological
Phonetics
Speech Perception / physiology*

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


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