Form of epilepsy. Jacksonian seizure (or jacksonian march) is a form of epilepsy involving abnormal electrical activity that travels in succession through the primary motor cortex, affecting the corresponding muscles. It usually begins in the fingers and then progresses proximally and involves tingling and numbness, rapid head and eye movements, and sudden muscle contractions.
Moving effect. A jacksonian seizure starts in one location and spreads from there as it moves along the brain's motor strip. For instance it could start at the fingers, move to the hand, up the arm to the shoulder and from there will move along the leg and then usually generalize to involve the whole body.