title: Altered motor cortex excitability in tinnitus patients: a hint at crossmodal plasticity.
abstract: Idiopathic tinnitus is a frequent and often debilitating auditory phantom perception of largely unknown pathological conditions. In electrophysiological and functional neuroimaging studies, affected subjects have shown excessive spontaneous activity in the central auditory system. To further investigate the underlying central nervous component, we assessed motor cortex excitability in 19 patients with chronic tinnitus by means of transcranial magnetic stimulation (TMS). When results were compared with data from 19 healthy controls matched for age and sex, we found significantly enhanced intracortical facilitation in tinnitus patients. These findings parallel excitability changes after limb amputation and experimental deafferentation. Our results give further support to crossmodal interactions involving neuroplastic changes in some forms of tinnitus and may help to better understand mechanisms of maladaptive cortical reorganisation involved in phantom perceptions.
authors.affiliation: Department of Psychiatry and Psychotherapy, University of Regensburg, Universitaetsstrasse 84, 93053 Regensburg, Germany. berthold.langguth@medbo.de
authors.forename: Berthold
authors.initials: B
authors.lastname: Langguth
authors.forename: Peter
authors.initials: P
authors.lastname: Eichhammer
authors.forename: Marc
authors.initials: M
authors.lastname: Zowe
authors.forename: Tobias
authors.initials: T
authors.lastname: Kleinjung
authors.forename: Peter
authors.initials: P
authors.lastname: Jacob
authors.forename: Harald
authors.initials: H
authors.lastname: Binder
authors.forename: Philipp
authors.initials: P
authors.lastname: Sand
authors.forename: Göran
authors.initials: G
authors.lastname: Hajak
mesh_terms: D000328:Adult; D001303:Auditory Cortex / Q000503:physiopathology; D004558:Electric Stimulation; D004576:Electromyography; D019054:Evoked Potentials, Motor / Q000502:physiology*; D005260:Female; D006801:Humans; D008280:Magnetics; D008297:Male; D008875:Middle Aged; D009044:Motor Cortex / Q000502:physiology*; D009119:Muscle Contraction / Q000502:physiology; D018482:Muscle, Skeletal / Q000294:innervation / Q000502:physiology; D009434:Neural Pathways / Q000502:physiology*; D009473:Neuronal Plasticity / Q000502:physiology*; D010591:Phantom Limb / Q000209:etiology / Q000503:physiopathology; D011712:Pyramidal Tracts / Q000502:physiology; D011930:Reaction Time / Q000502:physiology; D014012:Tinnitus / Q000503:physiopathology*