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Predictive coding theory suggests that conscious perception results from theinteraction between top-down and bottom-up signals in the brain. However, theelectrophysiological signatures of top-down predictions are not clear yet.Here, we cued subjects to expect a certain perceptual state in a binocularrivalry task and quantitatively analyzed their EEG signals during the cueperiod and prior to binocular rivalry task. We found that when predictions cansuccessfully influence the perception of the rivalrous stimuli, the power ofbeta band rhythms increases in primary visual cortices and beta band phase lagin a frontal-visual homologous channel pair was notably diminished. Buildingupon earlier works, our findings suggest that beta rhythm is potentiallyconsidered as a signature of top-down communication in the brain.

Top-down predictions influence binocular rivalry through beta band rhythms: a qEEG-based investigation