tACS to Improve Negative Symptoms & Cognition in Long-term Hospitalized Schizophrenia Patients.

Inclusion Criteria: * Inclusion criteria for long-term hospitalized schizophrenia patients: 1. Diagnosed with DSM-5 schizophrenia and hospitalized for more than half a year 2. Aged between 18 and 65 years old 3. Willing to participate in the study and sign the informed consent 4. Stable condition, PANSS total score changed less than 15% at least 2 months before the study. 5. Education level above primary school 6. Normal vision or normal after correction Inclusion criteria for normal control group: 1. No diagnosed mental illness 2. Aged between 18 and 65 years old 3. Willing to participate in the study and sign the informed consent 4. Education level above primary school 5. Normal vision or normal after correction 6. Residents living in Pudong community Exclusion Criteria: Exclusion criteria for long-term hospitalization of schizophrenia patients: 1. Combined diagnosis of other mental illnesses in DSM-5 2. History of severe neurological diseases, epilepsy, craniocerebral trauma, etc. 3. Severe organic diseases of the heart, liver, kidney and other organs that are unstable 4. Infectious skin diseases 5. Use of other drugs that affect the results during the study, such as benzodiazepines, non-benzodiazepine sedatives, and psychostimulants 6. Pregnant or lactating women 7. Patients with claustrophobia 8. Patients with alcohol, drugs Abuse history 9. Patients who have received TACS treatment in the past and have no effect or intolerance Exclusion criteria for normal control group: 1. Patients with a history of severe neurological diseases, epilepsy, craniocerebral trauma, etc. 2. Patients with severe organic diseases that cause instability of organs such as heart, liver, and kidney 3. Patients with infectious skin diseases 4. During the study, drugs that affect the results were used in combination, such as benzodiazepines, non-benzodiazepine sedatives, and psychostimulants 5. Pregnant or lactating women 6. Patients with claustrophobia 7. Patients with a history of alcohol and drug abuse -