Procedure

The test took 50 min to complete. In the first step, clinico-demographic and psychological scale data were collected (Tables I and ​andII).II). In the second step, fMRI scans and the GO/NO-go task were simultaneously performed. Once fMRI data were acquired, participants were paid and verbally debriefed.

Demographic characteristics of heroin-dependent Han Chinese patients undergoing methadone maintenance treatment.

Personality and psychological characteristics of heroin-dependent Han Chinese patients prior to and after 1-year methadone maintenance treatment.

Differences between time-points were assessed for significance using the paired sample t-test. BDI, Beck Depression Inventory-II; HAMA, Hamilton Anxiety scale; PWSS, Protracted Withdrawal Symptoms Scale; BIS, Barratt Impulsivity Scale; AI, attention impulsivity; MI, motor impulsivity; NPI, non-planned impulsivity.