Background To determine the usefulness of a few types of photic stimulation in patients with photoconvulsive response.Merhods: A clinical electroencephalographic study was conducted in nine children who developed convulsions and other symptoms while they watched the TV animation and were subsequently treated at the hospital. Photic stimulation was applied with their eyes open or closed. Another photic stimulation was applied with the video tape of the animation. Results: A photoparoxysmal response (PPR) was never seen in the electroencephalographs (EEG) in any of these patients when photic stimulation was applied with their eyes closed, while PPR was seen in three of seven patients when photic stimulation was applied with their eyes open. Two patients (siblings) showed no specific abnormality when photic stimulation was applied with their eyes either open or closed. However, myoclonus and PPR appeared when the EEG was conducted while they watched the video tape of the animation under supervised conditions. Concluswns: In a society where people are exposed to abundant TV games, TV animation or videos, selfrestraint or regulations of frequent use of flickering scenes is thought to be necessary. However, it is also thought to be necessary to conduct EEG by applying photic stimulation, not only with the eyes closed, but also with the eyes opened or by applying flickering red light stimulation, which is emitted from a strong light source, or a combination of two colors. such as red and blue or red and green, in patients with suspected photosensitivity. Key wordselectroencephalography, photic stimulation, photoparoxysmal response, photosensitive epilepsy, photosensitivity.On 16 December 1097. all over Japan, as many as 700 people, mostly children, developed convulsion, loss of consciousness, vomiting or epigastric distress among other symptoms, while they watched the TV animation. Pocket Monster and were urgently brought into. or visited. medical institutions for treatment: which created a great sensation in the community. As most of these patients developed convulsion or other symptoms when they watched the scene immediately before the completion of the program where a character named Pikachu emitted red and blue flickering light, researchers directed attention to a causal relationship associated with photosensitive epilepsy. The authors treated nine such children who developed the aforementioned symptoms at the Department of Correspondence: Shin-ichi Niijima.

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