Fig. 5

The average pre-fixation alpha power change between 1st half and 2nd half of the experiment. A The voltage map showed that the pre-cue alpha was the strongest in the occipital area. B Cluster-based permutation analysis on the pre-fixation interval (− 3 to 2 s relative to the onset of stimuli) revealed an enhanced alpha power in 2nd half of the experiment for both migraine and control. The power differences were maximal in the occipital regions (significant channels are highlighted with an asterisk (*) (migraine: p < .001; control: p = .004). C There was no significant difference in pre-fixation alpha between migraine and control for both 1st half and 2nd half of the experiment. D The alpha power increase in the 2nd half was also not significantly different between migraine and control