Afferent input is critically important for normal development of central auditory nuclei. This project will assess the capacity of a cochlear prosthesis to provide such input in a congenitally deaf animal model. The proposed series of studies will compare morphometric and physiologic changes in the central auditory tract in deaf Dalmatians stimulated with a multichannel cochlear prosthesis with similar measures in untreated deaf and hearing Dalmatians of similar age. These studies will extend current work on changes in the peripheral auditory tract of the deaf Dalmatian. The rationale for these studies is based on 1) observations that auditory deprivation induces measurable changes in the volume of defined cell regions of central auditory nuclei and cell size, 2) auditory tract pathologic changes exhibited by the deaf Dalmatian that suggest it to be an especially appropriate model of congenital human deafness, and 3) early studies that suggest that electrical stimulation may exert a trophic effect on neurons of the peripheral auditory tract. It is anticipated that results from these studies will provide fundamental neuroanatomic information crucial to understanding the effects of prosthetic intervention in early human deafness. These studies are the focus of this 5 year Clinician Investigator Development Award application. Extended g in morphometric, electrophysiologic and statistical analysis will be organized around the proposed project. This training will be used to provide a basic framework that will complement a comprehensive neurotologic program of study of early sensorineural hearing loss and its treatment.

Agency
National Institute of Health (NIH)
Institute
National Institute on Deafness and Other Communication Disorders (NIDCD)
Type
Clinical Investigator Award (CIA) (K08)
Project #
5K08DC000037-02
Application #
3080288
Study Section
Communicative Disorders Review Committee (CDR)
Project Start
1989-09-01
Project End
1991-08-31
Budget Start
1990-09-01
Budget End
1991-08-31
Support Year
2
Fiscal Year
1990
Total Cost
Indirect Cost
Name
University of Michigan Ann Arbor
Department
Type
Schools of Medicine
DUNS #
791277940
City
Ann Arbor
State
MI
Country
United States
Zip Code
48109