Brain Anatomy
Seizure Types

 > Partial | Partial with Secondary Generalization | Generalized

Generalized Seizure

In contrast to partial seizures, which arise in a small area of the brain's cerebral cortex, generalized seizures involve both hemispheres spontaneously at onset. Variation from one type of generalized seizure to another suggests that some types may involve structures deep within the brain in addition to the cerebral hemispheres. Absence seizures, for example, are thought to originate in the thalamus. Involvement of areas of the brain in addition to the cerebral cortex may explain why the characteristics of different types of generalized seizures vary so greatly.