Increasing spectral resolution in cochlear implants using current steering and current focusing

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Title	Increasing spectral resolution in cochlear implants using current steering and current focusing
Author	Srinivasan, Arthi Grace
Author email	agsriniva@gmail.com
Degree	Doctor of Philosophy
Document type	Dissertation
Degree program	Biomedical Engineering
School	Viterbi School of Engineering
Date defended/completed	2012-06-01
Date submitted	2012-06-25
Date approved	2012-06-25
Restricted until	2012-06-25
Date published	2012-06-25
Advisor (committee chair)	Shannon, Robert V.
Advisor (committee member)	Grzywacz, Norberto Weiland, James Loeb, Gerald Bottjer, Sarah
Abstract	Cochlear implants (CIs) are a device used to treat sensorineural hearing loss. The CI works by bypassing the hair cells of the cochlea and directly stimulating the auditory nerve. Most CI users tend to have excellent speech recognition in quiet and can even talk on the telephone. However, CI users tend to struggle with understanding speech in more difficult listening environments, such as in noisy restaurants. ❧ It is thought that CI users’ difficulty with speech perception in noise is due to channel interactions between stimulating electrodes – due to broad current spread, adjacent electrodes may stimulate overlapping populations of neurons; those electrodes therefore do not convey independent channels of information. Therefore, reducing current spread from a stimulating electrode may narrow the population of activated neurons, and consequently, reduce channel interactions and increase the number of independent channels of information transmitted by the CI. That is, reducing current spread could improve CI users’ speech perception ability in noise. ❧ The primary goal of this dissertation was to investigate current focusing as a method of reducing channel interactions in CIs. Current focusing was studied in both psychophysical and speech perception experiments. The results show that current focusing can reduce spread of excitation in the cochlea, improve signal discrimination, and improve speech perception in noise.
Keyword	cochlear implants; auditory system; psychophysics; current shaping
Language	English
Part of collection	University of Southern California dissertations and theses
Publisher (of the original version)	University of Southern California
Place of publication (of the original version)	Los Angeles, California
Publisher (of the digital version)	University of Southern California. Libraries
Provenance	Electronically uploaded by the author
Type	texts
Legacy record ID	usctheses-m
Rights	Srinivasan, Arthi Grace
Access conditions	The author retains rights to his/her dissertation, thesis or other graduate work according to U.S. copyright law. Electronic access is being provided by the USC Libraries in agreement with the author, as the original true and official version of the work, but does not grant the reader permission to use the work if the desired use is covered by copyright. It is the author, as rights holder, who must provide use permission if such use is covered by copyright. The original signature page accompanying the original submission of the work to the USC Libraries is retained by the USC Libraries and a copy of it may be obtained by authorized requesters contacting the repository e-mail address given.
Repository name	University of Southern California Digital Library
Repository address	USC Digital Library, University of Southern California, University Park Campus MC 7002, 106 University Village, Los Angeles, California 90089-7002, USA
Repository email	cisadmin@usc.edu
Archival file	uscthesesreloadpub_Volume4/etd-Srinivasan-904.pdf

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Increasing spectral resolution in cochlear implants using current steering and current focusing

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