Photic activationの経験

It was concluded that one of the most valuable activating method for EEG. is photic stimulation. But the existing photic stimulator is quite expensive. (1) We designed a simple cheap photic stimulater by using a slide-projector and circling disc with windows. (2) That stimulater was valuable for precipitating abnormal EEG., from epileptic patient during the interval stage of its clinical seizure.