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2014 ; 15
(6
): 1007-22
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Effects of unilateral acoustic trauma on tinnitus-related spontaneous activity in
the inferior colliculus
#MMPMID25255865
Ropp TJ
; Tiedemann KL
; Young ED
; May BJ
J Assoc Res Otolaryngol
2014[Dec]; 15
(6
): 1007-22
PMID25255865
show ga
This study describes the long-term effects of sound-induced cochlear trauma on
spontaneous discharge rates in the central nucleus of the inferior colliculus
(ICC). As in previous studies, single-unit recordings in Sprague-Dawley rats
revealed pervasive increases in spontaneous discharge rates. Based on differences
in their sources of input, it was hypothesized that physiologically defined
neural populations of the auditory midbrain would reveal the brainstem sources
that dictate ICC hyperactivity. Abnormal spontaneous activity was restricted to
target neurons of the ventral cochlear nucleus. Nearly identical patterns of
hyperactivity were observed in the contralateral and ipsilateral ICC. The
elevation in spontaneous activity extended to frequencies well below and above
the region of maximum threshold shift. This lack of frequency organization
suggests that ICC hyperactivity may be influenced by regions of the brainstem
that are not tonotopically organized. Sound-induced hyperactivity is often
observed in animals with behavioral signs of tinnitus. Prior to
electrophysiological recording, rats were screened for tinnitus by measuring gap
pre-pulse inhibition of the acoustic startle reflex (GPIASR). Rats with positive
phenotypes did not exhibit unique patterns of ICC hyperactivity. This ambiguity
raises concerns regarding animal behavioral models of tinnitus. If our screening
procedures were valid, ICC hyperactivity is observed in animals without
behavioral indications of the disorder. Alternatively, if the perception of
tinnitus is strictly linked to ongoing ICC hyperactivity, our current behavioral
approach failed to provide a reliable assessment of tinnitus state.