epilepsy, Jacksonian

epilepsy, Jacksonian A seizure disorder that is characterized by progressive spreading of abnormal sensations or movements from one local area of the body to more widespread areas. Jacksonian epilepsy is caused by the progressive spread of abnormal electrical activity in the motor cortex of the brain. Seizures of this type typically cause no change in awareness or alertness. They are transient, fleeting, and ephemeral. Jacksonian seizures are extremely varied and may involve, for example, apparently purposeful movements such as turning of the head, eye movements, smacking of the lips, mouth movements, drooling, rhythmic muscle contractions in a part of the body, abnormal numbness, tingling, and a crawling sensation over the skin. Diagnosis is made through observation and EEG. Treatment, if necessary, is with antiseizure medications. Also called Jacksonian seizure disorder. See also seizure, partial.