Rhythmic after-activity to flashes in relation to the background alpha which precedes and follows the photic stimuli.
D000328:Adult; D001921:Brain / Q000502:physiology*; D004569:Electroencephalography; D005071:Evoked Potentials; D006801:Humans; D008027:Light; D009778:Occipital Lobe / Q000502:physiology