Waves of consciousness: ongoing cortical patterns during binocular rivalry.
Neuroimage September 1, 2004 Diego Cosmelli, Olivier David, Jean-Philippe Lachaux et al.
During binocular rivalry, when perception alternates between two competing images, distributed brain activity correlates with which image is consciously seen. Magnetoencephalography (MEG) recordings showed that neural responses to a frequency-tagged stimulus were modulated during its perceptual dominance. Source estimation revealed activation not only in visual cortex but also in parietal, temporal pole, and frontal regions. Perceptual switches modulated activity in visual cortex, medial parietal, and left frontal areas. During dominance, occipital and frontal regions, including anterior cingulate and medial frontal areas, became coactivated. Phase synchrony in the frequency tag band revealed a dynamically modulated distributed cortical network that varied in extent across individuals.