A form of epilepsy involving brief alteration in movement,
sens ation or nerve function caused by abnormal electrical activity in a localized
area of the brain. Seizures of this type typically cause no change in awareness
or alertness. They are transient, fleeting, ephemeral.
Jacksonian seizures are extremely varied and may involve, for example, apparently
purposeful movements such as turning the head, eye movements, smacking the lips,
mouth movements, drooling, rhythmic muscle contractions in a part of the body, abnormal
numbness, tingling, and a crawling sensation over the skin.
These seizures are named for the English neurologist, John Hughlings Jackson,
who studied speech defects in brain disorders and confirmed the location in the
brain of the speech center ("Broca's center"). He described what are today called
Jacksonian seizures in 1863 and in 1875 found the areas in the brain that caused
them. Jackson was among the towering figures of 19th-century medicine, one of "the
great men of medicine." (There were few, if any, women in medicine in the 19th century.)
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