This study will examine both physical and neural-perceptual channel interactions that occur with stimulation of multiple channel cochlear implants. Specifically, the effects of channel interactions on percepts of stimulus detection thresholds and loudness estimation for dual-channel stimulation will be examined and quantified. In addition, a battery of speech recognition tests will be performed and correlated with the above mentioned measures of channel interaction. For all of these measurements, the degree of channel interaction will be manipulated by controlling the spatial extent of the electrical current configuration delivered to each of several cochlear implant channels. Cochlear electrode configurations will consist of monopolar (MP), bipolar (BP) with adjacent active and return electrodes within the scala tympani, and tripolar (TP) with one active electrode and two flanking return electrodes. The overall hypotheses to be tested are that channel interactions will be reduced when a spatially restricted electrical current configuration is employed and that reduction in channel interactions should lead to enhanced subject performance on speech recognition. The results of these studies could influence the development of future cochlear implant electrodes and speech processing strategies, ideally, leading to improved performance for most cochlear implant subjects.

Agency
National Institute of Health (NIH)
Institute
National Institute on Deafness and Other Communication Disorders (NIDCD)
Type
Postdoctoral Individual National Research Service Award (F32)
Project #
5F32DC005883-02
Application #
6641184
Study Section
Special Emphasis Panel (ZDC1-SRB-J (18))
Program Officer
Sklare, Dan
Project Start
2002-09-04
Project End
2005-07-31
Budget Start
2003-09-01
Budget End
2004-08-31
Support Year
2
Fiscal Year
2003
Total Cost
$46,420
Indirect Cost
Name
University of California San Francisco
Department
Otolaryngology
Type
Schools of Medicine
DUNS #
094878337
City
San Francisco
State
CA
Country
United States
Zip Code
94143