Job Agnès, Jacob Roland, Pons Yoann, Raynal Marc, Kossowski Michel, Gauthier Jérôme, Lombard Bertrand, Delon-Martin Chantal
IRBA, Institut de Recherche Biomédicale des Armées, Bretigny Sur Orge, France.
INSERM, U836, Grenoble, France.
Brain Struct Funct. 2016 Mar;221(2):913-22. doi: 10.1007/s00429-014-0944-0. Epub 2014 Dec 12.
The phantom sound perception mechanism by which a sound perception occurs without any external sound source is still enigmatic. According to our previous fMRI study, a small region in the parietal operculum 3 was hyperactivated as a function of tinnitus periodicity in subjects with acoustic trauma tinnitus sequelae. This region was localized in the vicinity of neural correlates of middle-ear tympano-ossicular chain movements due to pressure variations. Disturbed proprioceptors are known to trigger illusory perceptions; therefore, we hypothesized that a disturbance of middle-ear proprioceptors may originate phantom sound perceptions. We designed an fMRI study that aimed to stimulate middle-ear proprioceptors by repetitive vibrations using various rates of click trains. In this study, we report that exposure to specific rates of stimuli for a few minutes at comfortable intensity level in healthy subjects distinctly triggered transient tinnitus-like aftereffects. The fMRI neural correlates of the aftereffects were unequivocally localized in the same parietal region as in acoustic trauma tinnitus sufferers. Our results strongly suggest that a middle-ear kinesthetic/proprioceptive illusion exists at the origin of acoustic trauma tinnitus via a somatosensory pathway encompassing the trigeminal system.
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