In seizure disorders, the brain’s electrical activity is periodically disturbed, resulting in some degree of temporary brain dysfunction. Many people have unusual sensations just before a seizure starts. Some seizures cause uncontrollable shaking and loss of consciousness, but more often, people simply stop moving or become unaware of what is happening. Doctors suspect the diagnosis based on symptoms, but imaging of the brain, blood tests, and electroencephalography (to record the brain’s electrical activity) are usually needed to identify the cause. If needed, drugs can usually prevent seizures.
http://www.merck.com/mmhe/sec06/ch085/ch085a.html
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