EEG is free of radiation. EEG examinations are mainly performed by recording the spontaneous bioelectric potentials of the brain through the amplification of the instrument to obtain the corresponding graphs. Every cell of the brain is carrying out bioelectrical activity, and EEG examination can produce specific waveforms, which can visualize the distribution of brain waves. EEG is a non-invasive, scientific and safe test. There are usually conventional EEG monitoring, video EEG monitoring and dynamic EEG monitoring, which are suitable for different groups of people with different conditions. Avoid blinking, swallowing, gnashing of teeth or shaking of the head. 3. Keep the muscles of the whole body relaxed during the examination to avoid interference with the electromyography. EEG can be used to assist in the diagnosis of epilepsy, disorders of consciousness, cranial occupational lesions, cranial trauma, etc.