Chapter

Objective assessment of tinnitus

Jos J. Eggermont

in The Neuroscience of Tinnitus

Published in print May 2012 | ISBN: 9780199605606
Published online September 2012 | e-ISBN: 9780191741555 | DOI: http://dx.doi.org/10.1093/acprof:oso/9780199605606.003.0004
Objective assessment of tinnitus

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In patients with tinnitus, structural and functional brain imaging combined with electro- and magnetoencephalograms have suggested correlations between aspects of tinnitus and brain functioning. Participating brain regions are among others in the auditory cortex, in the limbic system and in the cerebellum. Spontaneous EEG and MEG points to a reduction of alpha-band activity and an increase in delta- and gamma-band activity. The strength of the latter appears to correlate well with tinnitus loudness, whereas that of the alpha- and delta-band relates more to the level of annoyance caused by the tinnitus. The clear changes in spontaneous synchrony in the MEG activity between different neocortical areas in tinnitus patients also suggest wide involvement of brain areas in this disorder.

Keywords: oto-acoustic emissions; brain imaging; brodman areas; electroencephalogram; auditory evoked potentials; brain rhythms

Chapter.  8884 words.  Illustrated.

Subjects: Neuroscience

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