Document Detail

The relationship between stream segregation and frequency discrimination in normally hearing and hearing-impaired subjects.
MedLine Citation:
PMID:  15925188     Owner:  NLM     Status:  MEDLINE    
We examined the relationship between the fission boundary (FB) at which a sequence of pure tones alternating between two frequencies cannot be heard as two separate streams and the frequency difference limen (FDL), using normally hearing subjects and subjects with cochlear hearing loss. The stimuli used in the two tasks were as similar as possible in duration and inter-tone interval. The frequency range examined was 250-8000 Hz for the normally hearing subjects and 250-2000 Hz for the hearing-impaired subjects. For normally hearing subjects, the FBs were almost invariant with frequency when expressed as ERB(N) values; the mean FB was about 0.4 ERB(N). The FDLs, also expressed as ERB(N) values, increased for frequencies above 2000 Hz. The ratio FB/FDL was roughly constant at 7-9 in the frequency region 250-2000 Hz, but decreased for higher frequencies, reaching about 1 at 8000 Hz. For the hearing-impaired subjects, FB/FDL ratios varied over a large range (1-40), and were not systematically related to the amount of hearing loss. These results suggest that the FB is not determined solely by the discriminability of successive tones.
Marina M Rose; Brian C J Moore
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-01-22
Journal Detail:
Title:  Hearing research     Volume:  204     ISSN:  0378-5955     ISO Abbreviation:  Hear. Res.     Publication Date:  2005 Jun 
Date Detail:
Created Date:  2005-05-31     Completed Date:  2006-01-12     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7900445     Medline TA:  Hear Res     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  16-28     Citation Subset:  IM    
Department of Experimental Psychology, University of Cambridge, Downing Street, Cambridge CB2 3EB, England.
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MeSH Terms
Acoustic Stimulation
Aged, 80 and over
Audiometry, Pure-Tone
Auditory Threshold / physiology*
Case-Control Studies
Differential Threshold / physiology
Hearing Loss, Sensorineural / physiopathology*
Middle Aged
Pitch Perception / physiology*
Regression Analysis
Time Factors

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

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