Seizure

A sudden, uncontrolled burst of electrical activity in the brain that can cause changes in behavior, movements, feelings, or consciousness. Seizures vary widely in type and severity, from brief lapses in awareness (absence seizures) to full convulsions (tonic-clonic seizures). For people with photosensitive epilepsy, seizures can be triggered by flashing lights, bold patterns, or certain video content. In the digital accessibility context, preventing visually-triggered seizures is addressed by WCAG Success Criteria 2.3.1 and 2.3.2, which limit flashing content.