Definitions:

1. A form of focal epilepsy where seizures originate in one area of the brain, typically the motor cortex, and cause rhythmic muscle contractions that start in one part of the body and then spread to other parts, usually in a sequential manner. NOUN
   • During a Jacksonian seizure, the patient experienced rhythmic twitching that began in her hand and gradually spread to her arm.
2. Focal epilepsy in which the attack usually moves from distal to proximal limb muscles on the same side of the body. NOUN
   • Unlike other forms of epilepsy, Jacksonian seizures typically do not cause a loss of consciousness.

Synonyms:

• jacksonian seizure