Patients with mental disorders may have hallucinations and hallucinations, hallucinations are called auditory hallucinations and hallucinations refer to visual hallucinations. Mental disorders are further divided into organic mental disorders and functional mental disorders. The former refers to mental disorders with clear etiology, such as patients with exact structural or functional brain damage, commonly seen in cerebral infarction, cerebral hemorrhage, brain tumor, encephalitis, and advanced stages of degenerative diseases, such as Alzheimer’s and Parkinson’s disease. Such mental disorders, cranial MRI or functional MRI, can reveal abnormal brain lesions. Functional psychiatric disorders are most often seen in primary psychiatric disorders, such as schizophrenia, delusional disorder, obsessive-compulsive disorder, etc. In these patients, the brain examination cannot detect structural damage, but the EEG will be abnormal, also accompanied by a family history.