Tinnitus and temporary hearing loss result in differential noise-induced spatial reorganization of brain activity

Brain Structure & Function
Antonela MucaAvril Genene Holt

Abstract

Loud noise frequently results in hyperacusis or hearing loss (i.e., increased or decreased sensitivity to sound). These conditions are often accompanied by tinnitus (ringing in the ears) and changes in spontaneous neuronal activity (SNA). The ability to differentiate the contributions of hyperacusis and hearing loss to neural correlates of tinnitus has yet to be achieved. Towards this purpose, we used a combination of behavior, electrophysiology, and imaging tools to investigate two models of noise-induced tinnitus (either with temporary hearing loss or with permanent hearing loss). Manganese (Mn2+) uptake was used as a measure of calcium channel function and as an index of SNA. Manganese uptake was examined in vivo with manganese-enhanced magnetic resonance imaging (MEMRI) in key auditory brain regions implicated in tinnitus. Following acoustic trauma, MEMRI, the SNA index, showed evidence of spatially dependent rearrangement of Mn2+ uptake within specific brain nuclei (i.e., reorganization). Reorganization of Mn2+ uptake in the superior olivary complex and cochlear nucleus was dependent upon tinnitus status. However, reorganization of Mn2+ uptake in the inferior colliculus was dependent upon hearing sensitivity. Furthermore, ...Continue Reading

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Citations

Aug 26, 2020·Expert Opinion on Drug Discovery·Isabel Varela-NietoLuis Lassaletta
Nov 9, 2019·Scientific Reports·André KühlAvril Genene Holt
Dec 5, 2019·The Journal of the Acoustical Society of America·Avril Genene HoltRichard Altschuler

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Software Mentioned

SAS
StatView
MRIcro
DaqGen
R language scripts
Daqarta ( Data AcQuisition And Real - Time Analysis )
Daqarta
MEMRI
Image J

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