Seizures caused by the brightly flashing images in video games are more common than most people realize. They can happen even in people with no history of seizures. Most individuals with this type of visual sensitivity (a condition often called photosensitive epilepsy) have their first seizure before knowing they need to be careful around the flash, flicker, on-screen patterns, and intense colors in video games.
This site explains what you should know so that you can be alert for signs of seizures in yourself and others.
Visit my blog Seizures from Video Games for discussion of medical research findings, commentary on game industry news, and accounts of real people with video game seizures. You can also learn more about me there.