(A) Partial seizure is the first clinical and EEG changes suggesting that the beginning neuronal activation is limited to a part of one cerebral hemisphere. 1. Simple partial seizure No impairment of consciousness. Focal discharges can be recorded on EEG during or between seizures in the corresponding representative area on the opposite side of the brain. (1) Seizures with motor symptoms Jin Junkong, Department of Neurosurgery, Tangdu Hospital, Fourth Military Medical University (2) Seizures with somatosensory or specific sensory symptoms (3) Seizures with autonomic symptoms (4) Seizures with psychiatric symptoms 2. complex partial seizures There is an impairment of consciousness and the EEG is unilateral or bilateral asynchronous discharges during the seizure, usually located in the temporal or frontal area. (1) Simple partial seizure onset followed by impaired consciousness (2) Onset from impaired consciousness 3. Partial seizure progressing to secondary generalized seizure EEG during seizure is partial seizure discharge, which becomes diffuse secondary and rapidly. (2) Generalized seizure A generalized seizure is the first clinical change suggesting simultaneous involvement of both hemispheres from the beginning. Impaired consciousness can be the earliest manifestation, and motor symptoms and EEG changes of the seizure are bilateral, which may reflect extensive distribution of neural discharges in both hemispheres. (1) Typical aphasic seizure The EEG during the seizure is a regular and synchronous symmetrical 3-Hz spike-slow complex wave or multiple spike-slow complex waves. The EEG background activity is normal between seizures, but there may be paroxysmal activity (such as spike wave or spike-slow complex wave). (2) Atypical aphasic seizure The EEG during the seizure is more disorganized, including irregular spike-slow complex waves, fast activity or other paroxysmal 2. The EEG between seizures is the same as that during seizures. 3.Clonic seizure The EEG is fast activity (above 10Hz) and slow waves, occasionally spike-slow complex waves. 4.Tonic seizures EEG is low amplitude fast activity or fast rhythm above 9~10Hz during seizure, with decreasing frequency and increasing amplitude. Between seizures, different degrees of rhythmic spike and slow complex wave discharges are seen, sometimes asymmetrical, and the background activity is often abnormal. 5.Tonic clonic seizure (grand mal seizure) The EEG is 10Hz or more rhythmical during seizure, with decreasing frequency and increasing amplitude during tonic phase, and excessive spike wave. The spike wave alternates with the slow wave during the clonic phase. 6.Dystonic seizure EEG is multi-spike slow complex wave or low flat or low amplitude fast activity during seizure. In between seizures, it is multi-spike slow complex waves.