Influence of task difficulty and mental effort on the transient gamma response and its sources in the auditory cortex and the anterior cingulate cortex

High frequency oscillations in the 40Hz γ-range are involved in the synchronization of brain regions e.g. in cognitive functions like selective attention. Thus it is assumed that investigating gamma-activity can give answers to the questions about how information is processed by the brain, the interaction of brain regions and the temporal dynamics of brain activity. In the present study, we were interested in the relationship between the transient gamma response (TGR) and task difficulty and mental effort. The TGR is known to be affected by attention. It has been suggested that besides auditory cortex activity,…