Induced gamma band responses in the human EEG and selective stimulus processing

Müller, M. M.
Department of Psychology, University of Leipzig, Germany

In everyday life, the brain is confronted with an enormous amount of visual input at any given moment. To guarantee coherent and adaptive behaviour, selective attention is needed to focus the limited processing resources on the relevant part of the available information while ignoring the rest. It is generally appreciated that selective visual information processing is performed in multiple cortical areas. Synchronized neural activity in the gamma frequency range (> 20 Hz) has been proposed as being the key to the question of how information processed in different cortical areas is bound together to form a percept. We present a series of experiments in which we demonstrated that induced GBRs are modulated by selective attention. From these experiments we conclude that synchronized neuronal activity might serve as a powerful mechanism to increase the signal of the attended stimulus from the background “noise”.