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2015 ; 322
(ä): 200-11
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Longitudinal performance of an implantable vestibular prosthesis
#MMPMID25245586
Phillips C
; Ling L
; Oxford T
; Nowack A
; Nie K
; Rubinstein JT
; Phillips JO
Hear Res
2015[Apr]; 322
(ä): 200-11
PMID25245586
show ga
Loss of vestibular function may be treatable with an implantable vestibular
prosthesis that stimulates semicircular canal afferents with biphasic pulse
trains. Several studies have demonstrated short-term activation of the
vestibulo-ocular reflex (VOR) with electrical stimulation. Fewer long-term
studies have been restricted to small numbers of animals and stimulation designed
to produce adaptive changes in the electrically elicited response. This study is
the first large consecutive series of implanted rhesus macaque to be studied
longitudinally using brief stimuli designed to limit adaptive changes in
response, so that the efficacy of electrical activation can be studied over time,
across surgeries, canals and animals. The implantation of a vestibular prosthesis
in animals with intact vestibular end organs produces variable responses to
electrical stimulation across canals and animals, which change in threshold for
electrical activation of eye movements and in elicited slow phase velocities over
time. These thresholds are consistently lower, and the slow phase velocities
higher, than those obtained in human subjects. The changes do not appear to be
correlated with changes in electrode impedance. The variability in response
suggests that empirically derived transfer functions may be required to optimize
the response of individual canals to a vestibular prosthesis, and that this
function may need to be remapped over time. This article is part of a Special
Issue entitled .