The level of selective visual attention is closely related to the intensity of sustained γ band synchronization in early visual areas

Aim: Cortical gamma band synchronization is associated with attention. Accordingly, directing attention to certain visual stimuli modulates gamma band activity in visual cortical areas. However, gradual effects of attention and behavior on gamma band activity in early visual areas have not been reported. By reallocating available resources between simultaneously presented bimodal stimuli graded attention effects can be studied. Methods: In the present study, the degree of selective visual attention was gradually varied in a cued bimodal reaction time paradigm using audio-visual stimuli. Participants were 16 heal…