Tinnitus intensity dependent gamma oscillations of the contralateral auditory cortex.

Non-pulsatile tinnitus is considered a subjective auditory phantom
phenomenon present in 10 to 15% of the population. Tinnitus as a
phantom phenomenon is related to hyperactivity and reorganization
of the auditory cortex. Magnetoencephalography studies demonstrate
a correlation between gamma band activity in the contralateral
auditory cortex and the presence of tinnitus. The present study
aims to investigate the relation between objective gamma-band
activity in the contralateral auditory cortex and subjective
tinnitus loudness scores. In unilateral tinnitus patients (N = 15;
10 right, 5 left) source analysis of resting state
electroencephalographic gamma band oscillations shows a strong
positive correlation with Visual Analogue Scale loudness scores in
the contralateral auditory cortex (max r = 0.73, p