Generalised seizures (primary) are caused by seizure activity in both hemispheres of the brain simultaneously. Consciousness is lost at the onset of the seizure.
Generalised seizures can be convulsive or non-convulsive, for example tonic-clonic or absence seizures.
When the seizure activity starts in one region of the brain (focal) but spreads to both hemispheres, it is called a ‘focal seizure evolving to a bilateral convulsive seizure’.
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