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Nat Rev Neurol. 2016 Mar;12(3):150-60. doi: 10.1038/nrneurol.2016.12. Epub 2016 Feb 12.

Maladaptive plasticity in tinnitus--triggers, mechanisms and treatment.

Author information

1
Department of Otolaryngology, Molecular and Integrative Physiology, Biomedical Engineering, University of Michigan, 1150 W Medical Center Drive, Michigan 48104, USA.
2
Department of Psychology, Neuroscience, and Behavior, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4K1, Canada.
3
Department of Psychiatry and Psychotherapy and Interdisciplinary Tinnitus Clinic, University of Regensburg, Universitätsstr. 84, D-93053 Regensburg, Germany.

Abstract

Tinnitus is a phantom auditory sensation that reduces quality of life for millions of people worldwide, and for which there is no medical cure. Most cases of tinnitus are associated with hearing loss caused by ageing or noise exposure. Exposure to loud recreational sound is common among the young, and this group are at increasing risk of developing tinnitus. Head or neck injuries can also trigger the development of tinnitus, as altered somatosensory input can affect auditory pathways and lead to tinnitus or modulate its intensity. Emotional and attentional state could be involved in the development and maintenance of tinnitus via top-down mechanisms. Thus, military personnel in combat are particularly at risk owing to combined risk factors (hearing loss, somatosensory system disturbances and emotional stress). Animal model studies have identified tinnitus-associated neural changes that commence at the cochlear nucleus and extend to the auditory cortex and other brain regions. Maladaptive neural plasticity seems to underlie these changes: it results in increased spontaneous firing rates and synchrony among neurons in central auditory structures, possibly generating the phantom percept. This Review highlights the links between animal and human studies, and discusses several therapeutic approaches that have been developed to target the neuroplastic changes underlying tinnitus.

PMID:
26868680
PMCID:
PMC4895692
DOI:
10.1038/nrneurol.2016.12
[Indexed for MEDLINE]
Free PMC Article

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