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Partial seizures : are characterized by abnormal electrical activity involving only a small part of the brain . Sometimes a partial seizure can spread to the whole brain (secondary generalized seizure ) . There is a classification of partial seizures into simple and complex according to the degree of disturbance of consciousness . Simple partial seizures : produce no alteration of consciousness despite clinical manifestations which may include sensory, motor, or autonomic activity . Complex partial seizures : may produce similar sensory, motor, or autonomic activity , but are also characterized by some impairment or alteration of consciousness during the event .