the.com/seizure

A burst of uncontrolled electrical activity in the brain that can briefly affect movement, sensation, or awareness.

means A sudden surge of uncontrolled electrical activity in the brain, causing involuntary movements, sensations, or loss of awareness.

from From Old French 'seisir' (to take possession of), itself from Late Latin 'sacire', related to legal traditions of seizing property. For centuries 'seizure' meant any sudden, forcible taking — and a medical seizure kept that sense: the body seized, as if gripped and held by something outside its control.

origin
electrical storm of neurons firing in sync
not always
dramatic; some look like blank staring spells
misconception
you cannot swallow your tongue during one
first aid
time it, cushion the head, never restrain
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