NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Vestibulo-ocular and vestibulospinal function before and after cochlear implant surgeryVestibular function in cochlear implant candidates varies from normal to total absence of function. In patients with intact vestibular function preoperatively, invasion of the otic capsule places residual vestibular function at risk. Speech-processing strategies that result in large amplitude electrical transients or strategies that employ high amplitude broad frequency carrier signals have the potential for disrupting vestibular function. Five patients were tested with and without electrical stimulation via cochlear electrodes. Two patients experienced subjective vestibular effects that were quickly resolved. No long-term vestibular effects were noted for the two types of second generation cochlear implants evaluated. Histopathological findings from another patient, who had electrically generated vestibular reflex responses to intramodiolar electrodes, indicated that responses elicited were a function of several variables including electrode location, stimulus intensity, stimulus amplitude, and stimulus frequency. Differential auditory, vestibulocolic, and vestibulospinal reflexes were demonstrated from the same electrode as a function of stimulus amplitude, frequency, and duration.
Document ID
20040088972
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Black, F. O.
Lilly, D. J.
Peterka, R. J.
Fowler, L. P.
Simmons, F. B.
Date Acquired
August 21, 2013
Publication Date
January 1, 1987
Publication Information
Publication: The Annals of otology, rhinology & laryngology. Supplement
Volume: 96
Issue: 1 Pt 2 Suppl 128
ISSN: 0096-8056
Subject Category
Aerospace Medicine
Funding Number(s)
CONTRACT_GRANT: NS-19221
Distribution Limits
Public
Copyright
Other
Keywords
Case Reports
NASA Discipline Neuroscience
Non-NASA Center

Available Downloads

There are no available downloads for this record.
No Preview Available