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The cerebellar (para)flocculus: A review on its auditory function and a possible role in tinnitus
Lilian M Mennink1, J Marc C van Dijk2, Pim van Dijk3
1Department of Neurosurgery, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands; Department of Otorhinolaryngology/Head & Neck Surgery, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands; Graduate School of Medical Sciences, Research School of Behavioural and Cognitive Neurosciences, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands.
Abstract:
The cerebellum is historically considered to be involved in motor control and motor learning. However, it is also a site of multimodal sensory and sensory-motor integration, implicated in auditory processing. The flocculus and paraflocculus are small lobes of the cerebellum, in humans located in the cerebellopontine angle. The last two decades, both structures have been a subject of interest in hearing loss and tinnitus research. The current review summarizes insights on the auditory function of the (para)flocculus and its contribution to hearing loss and tinnitus. This leads to the hypothesis of a feedback loop between the paraflocculus and the auditory cortex. Disruption of this loop may be instrumental in both maintaining tinnitus and reducing tinnitus. Although the research mostly has been performed in animals, the implications in humans are also discussed. If the (para)flocculus indeed comprises an auditory function and is part of a tinnitus-mechanism, this would potentially open up new treatment options that involve direct intervention at the (para)flocculus.
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