Eyes-closed EEG analysis
Eyes-closed EEG data consisted of a 2-minute pre-task and a 2-minute post-task recording, which were highly correlated with each other (r = 0.91, P<0.001). Pre- and post-task recordings were therefore analysed as one dataset for each participant. We detected a moderate correlation in the expected direction ( r = -0.43, P<0.05) between eyes-closed peak alpha frequency and flash-fusion thresholds (Fig 3, left). We found no correlation between eyes-closed alpha power and flash-fusion thresholds (r = 0.14, P>0.05).