Document Detail

Variation in spectral-shape discrimination weighting functions at different stimulus levels and signal strengths.
MedLine Citation:
PMID:  17927430     Owner:  NLM     Status:  MEDLINE    
This study evaluated whether weights for spectral-shape discrimination depend on overall stimulus level and signal strength (the degree of spectral-shape change between two stimuli). Five listeners discriminated between standard stimuli that were the sum of six equal-amplitude tones and signal stimuli created by decreasing the amplitudes of three low-frequency components and increasing the amplitudes of three high-frequency components. Weighting functions were influenced by stimulus level in that the relative contribution of the low-frequency (decremented) components to the high-frequency (incremented) components decreased with increasing stimulus level. Although individual variability was present, a follow-up experiment suggested that the level dependence was due to greater reliance on high-frequency components rather than incremented components. Excitation-pattern analyses indicated that the level dependence is primarily, but not solely, driven by cochlear factors. In general, different signal strengths had no effect on the weighting functions (when normalized), but two of the five listeners showed variability in the shape of the weighting function across signal strengths. Results suggest that the effects of stimulus level on weighting functions and individual variability in the shapes of the weighting functions should be considered when comparing weighting functions across conditions and groups that might require different stimulus levels and signal strengths.
Jennifer J Lentz
Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural    
Journal Detail:
Title:  The Journal of the Acoustical Society of America     Volume:  122     ISSN:  1520-8524     ISO Abbreviation:  J. Acoust. Soc. Am.     Publication Date:  2007 Sep 
Date Detail:
Created Date:  2007-10-11     Completed Date:  2008-03-07     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7503051     Medline TA:  J Acoust Soc Am     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1702     Citation Subset:  IM    
Department of Speech and Hearing Sciences, Indiana University, Bloomington, Indiana 47405, USA.
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MeSH Terms
Acoustic Stimulation*
Analysis of Variance
Audiometry, Pure-Tone
Decision Support Techniques
Hearing / physiology*
Loudness Perception*
Middle Aged
Speech Discrimination Tests / methods*
Grant Support

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

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