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Patient 8, EEG: atypical absence in A and peculiar PPR in B and C, consisting of fast waves 1:1 related with flashes. Patient 11, resting EEG showing small occipital spikes in D; PPR showing fast waves 1:1 related with flashes in E and F. Parietooccipital channels are magnified in insets. IPS = intermittent photic stimulation; PPR = photoparoxysmal response.
