Abstract

Prior studies suggest that visual attention selects objects of interest by biasing the competition in favor of attended items. However, our current understanding of this competitive process is based on indirect inference. To fill this critical gap in our understanding of selective attention, we directly measured the interaction between two stimuli by using high-density EEG combined with cortical source localization. This technique offers a powerful approach to directly measure responses to individual stimuli (self-terms) as well as to their interaction (intermodulation term). Observers were tested with a pair of adjacent wedge-shaped gratings flickering at two different frequencies (7.14 Hz and 5.56 Hz, respectively), and two static wedge-shaped gratings located diametrically opposite the flickering wedges. By directing attention to one or both stimuli we determined how attention modulated the response to each stimulus as well as to the interaction between the two stimuli. These responses were compared to...

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