ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Epilepsy. Conceptual computer artwork of a brain in a cutaway human head, representing an epileptic attack (or seizure) as lightning in the brain. Bolts of lightning (or electricity) are seen in the cerebrum, which is the largest and most highly developed part of the brain. Epileptic seizures are caused by abnormal electrical activity in the brain. The normally ordered electrical activity associated with brain function becomes chaotic and unregulated during a seizure. In some cases, a stimulus, such as flashing lights, can trigger an attack, but normally there is no apparent cause. Epilepsy is thought to be caused by disease or injury, and may also be inherited.
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