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2014 ; 11
(6
): 066001
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Suppression and facilitation of auditory neurons through coordinated acoustic and
midbrain stimulation: investigating a deep brain stimulator for tinnitus
#MMPMID25307351
Offutt SJ
; Ryan KJ
; Konop AE
; Lim HH
J Neural Eng
2014[Dec]; 11
(6
): 066001
PMID25307351
show ga
OBJECTIVE: The inferior colliculus (IC) is the primary processing center of
auditory information in the midbrain and is one site of tinnitus-related
activity. One potential option for suppressing the tinnitus percept is through
deep brain stimulation via the auditory midbrain implant (AMI), which is designed
for hearing restoration and is already being implanted in deaf patients who also
have tinnitus. However, to assess the feasibility of AMI stimulation for tinnitus
treatment we first need to characterize the functional connectivity within the
IC. Previous studies have suggested modulatory projections from the dorsal cortex
of the IC (ICD) to the central nucleus of the IC (ICC), though the functional
properties of these projections need to be determined. APPROACH: In this study,
we investigated the effects of electrical stimulation of the ICD on
acoustic-driven activity within the ICC in ketamine-anesthetized guinea pigs.
MAIN RESULTS: We observed ICD stimulation induces both suppressive and
facilitatory changes across ICC that can occur immediately during stimulation and
remain after stimulation. Additionally, ICD stimulation paired with broadband
noise stimulation at a specific delay can induce greater suppressive than
facilitatory effects, especially when stimulating in more rostral and medial ICD
locations. SIGNIFICANCE: These findings demonstrate that ICD stimulation can
induce specific types of plastic changes in ICC activity, which may be relevant
for treating tinnitus. By using the AMI with electrode sites positioned with the
ICD and the ICC, the modulatory effects of ICD stimulation can be tested directly
in tinnitus patients.