The Novel Addiction Assessment Study in Synthetic Drugs Addiction

Criteria for synthetic drug abusers: Inclusion Criteria: * In accordance with the Diagnostic and Statistical Manual of Mental Disorders-5 (DSM-4) for methamphetamine (MA) use disorders; * Education level equal or more than 9 years; * Have normal or corrected-to-normal vision; * Have normal or corrected-to-normal hearing; * Less than 3 months before last drug use; Exclusion Criteria: * Current substance use (except nicotine or caffeine) ; * History of disease which influence cognition，such as seizure disorder、cerebrovascular disease、 head injury or other severe medication conditions; * Intelligence quotient less than 70. Criteria for healthy control: Inclusion Criteria: * Without schizophrenia family history; * Without history of drug abuse; * Education level equal or more than 9 years; * Have normal or corrected-to-normal vision; * Have normal or corrected-to-normal hearing. Exclusion Criteria: * History of disease which influence cognition，such as seizure disorder、cerebrovascular disease、head injury or other severe medication conditions; * Intelligence quotient less than 70.