Document Detail


Discrimination between sequential and simultaneous virtual channels with electrical hearing.
MedLine Citation:
PMID:  21895094     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
In cochlear implants (CIs), simultaneous or sequential stimulation of adjacent electrodes can produce intermediate pitch percepts between those of the component electrodes. However, it is unclear whether simultaneous and sequential virtual channels (VCs) can be discriminated. In this study, CI users were asked to discriminate simultaneous and sequential VCs; discrimination was measured for monopolar (MP) and bipolar + 1 stimulation (BP + 1), i.e., relatively broad and focused stimulation modes. For sequential VCs, the interpulse interval (IPI) varied between 0.0 and 1.8 ms. All stimuli were presented at comfortably loud, loudness-balanced levels at a 250 pulse per second per electrode (ppse) stimulation rate. On average, CI subjects were able to reliably discriminate between sequential and simultaneous VCs. While there was no significant effect of IPI or stimulation mode on VC discrimination, some subjects exhibited better VC discrimination with BP + 1 stimulation. Subjects' discrimination between sequential and simultaneous VCs was correlated with electrode discrimination, suggesting that spatial selectivity may influence perception of sequential VCs. To maintain equal loudness, sequential VC amplitudes were nearly double those of simultaneous VCs, presumably resulting in a broader spread of excitation. These results suggest that perceptual differences between simultaneous and sequential VCs might be explained by differences in the spread of excitation.
Authors:
David Landsberger; John J Galvin
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural    
Journal Detail:
Title:  The Journal of the Acoustical Society of America     Volume:  130     ISSN:  1520-8524     ISO Abbreviation:  J. Acoust. Soc. Am.     Publication Date:  2011 Sep 
Date Detail:
Created Date:  2011-09-07     Completed Date:  2012-01-11     Revised Date:  2013-06-27    
Medline Journal Info:
Nlm Unique ID:  7503051     Medline TA:  J Acoust Soc Am     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1559-66     Citation Subset:  IM    
Copyright Information:
© 2011 Acoustical Society of America
Affiliation:
Division of Communication and Auditory Neuroscience, House Ear Institute, 2100 West 3rd Street, Los Angeles, California 90057, USA. dlandsberger@hei.org
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MeSH Terms
Descriptor/Qualifier:
Acoustic Stimulation
Adult
Aged
Audiometry
Auditory Perception*
Auditory Threshold
Cochlear Implantation / instrumentation*
Cochlear Implants*
Correction of Hearing Impairment / psychology*
Discrimination (Psychology)*
Electric Stimulation
Female
Hearing Impaired Persons / psychology,  rehabilitation*
Humans
Loudness Perception
Male
Middle Aged
Signal Processing, Computer-Assisted
Time Factors
Grant Support
ID/Acronym/Agency:
R01-DC004993/DC/NIDCD NIH HHS; R03-DC010064/DC/NIDCD NIH HHS
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