Medically, EEG refers to electroencephalography, also known as topography of the brain. It is a commonly used adjunctive test in neurology that uses electrodes affixed to the scalp to record the electrical activity of the brain, and is an indirect means of detecting brain electricity. It is mainly used to identify and diagnose epilepsy, but can also be used to determine other diseases, such as syncope, migraine, central nervous system infection, Alzheimer’s disease, etc.; and psychiatric diseases, such as schizophrenia, can also be identified using EEG testing. EEG is divided into general EEG, video EEG, and 24-hour dynamic EEG. General EEG is often used for screening of diseases; video EEG is mostly used for children and infants; 24-hour dynamic EEG is used to look for epileptic waves and is often used to confirm the diagnosis of epilepsy.