Normal adult brain waves during waking hours are dominated by alpha rhythms of 8-12 Hz, and there can be a small amount of beta rhythms of 14-25 Hz in the frontotemporal lobe, and slow waves of less than 8 Hz are very rare. Slow waves less than 8 Hz are rare. Slow waves may gradually increase after sleep. Epileptic waves are mainly spikes, spikes, spike-slow waves, spike-slow waves and multi-spike slow waves. The typical aphasic seizures are mainly spike-slow complex waves, i.e., a spike followed by a slow wave. Tonic clonic seizures can be seen as multi-spike complex waves, i.e., two or more high-amplitude biphasic spike waves appearing in a rhythmic pattern. In myoclonic epilepsy, multiple spines and slow waves are common. The presence of epileptic waves does not necessarily mean that a seizure will occur; a seizure occurs after the abnormal discharge exceeds a threshold. Therefore, it is possible for many patients to record the appearance of seizure waves during the interictal period of a seizure.