Illustration of the paradigm and the SNR. A, Stimuli were flickering at 14.4 and 18 Hz (counterbalanced across runs) to induce SSVEP. B, SNR for different electrodes. C, Magenta and green curves represent illustrative SSVEP amplitudes for the two frequency-tagged stimuli. We epoched the data based on uninterrupted perceptual periods. Periods with dominance durations <1.5 s or >5 s were excluded. D, Histogram represents the distribution of all reported percept durations from all participants.