PARTIAL SEIZURE - A brief temporary alteration in movement, sensation, or autonomic nerve function caused by abnormal electrical activity in a localized area of the brain. Focal seizures (i.e. partial or Jacksonian seizures) usually cause no change in awareness or alertness. An example of a focal (partial) seizure would be rhythmic muscle contractions in one area of the body: lip smacking, mouth movements, drooling, head turning, eye movements, or seemingly purposeful movements (e.g. picking at clothes). Other presentations may be strictly sensory with abnormal numbness, tingling, or a "crawling" sensation to the skin. More unusual symptoms include changes in speech, thought, personality, mood, sensation of deja vu, or hallucinations.