Document Detail


Effects of phase duration and electrode separation on loudness growth in cochlear implant listeners.
MedLine Citation:
PMID:  10738817     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Loudness estimates were obtained in a group of four adult subjects implanted with the Nucleus-22 multielectrode cochlear implant device, for a range of pulse amplitudes and different fixed phase durations and electrode separations. The stimulus was a 200-ms long train of biphasic pulses presented at 500 pulses/s. Subjects estimated loudness as a number from 0 ("don't hear it") to 100 ("uncomfortably loud"). Loudness was found to grow exponentially with pulse amplitude, at a rate that was dependent upon the phase duration as well as the electrode separation. An equation of the form L = e(lambda + gamma M)(D theta)I, where L is the estimated loudness, M is the separation between electrodes of a stimulating pair, D is the phase duration, I is current amplitude, and lambda, gamma, and theta are constants, appears to describe the observed data adequately. The findings are remarkably consistent across subjects.
Authors:
M Chatterjee; Q J Fu; R V Shannon
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
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 Mar 
Date Detail:
Created Date:  2000-05-09     Completed Date:  2000-05-09     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  7503051     Medline TA:  J Acoust Soc Am     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1637-44     Citation Subset:  IM    
Affiliation:
Department of Auditory Implants and Perception, House Ear Institute, Los Angeles, California 90057, USA. monita@hei.org
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MeSH Terms
Descriptor/Qualifier:
Adult
Aged
Cochlear Implantation*
Electrodes
Humans
Loudness Perception / physiology*
Male
Middle Aged
Models, Biological
Speech Perception / physiology
Time Factors
Grant Support
ID/Acronym/Agency:
R01 DC01526-05/DC/NIDCD NIH HHS; R03 DC03519-01/DC/NIDCD NIH HHS

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


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