Using cognitive modelling to investigate the psychological processes of the Go/NoGo discrimination task in male abstinent heroin misusers

Aims To use cognitive modelling to investigate psychological processes underlying decision-making in male abstinent heroin misusers (AHMs). Design A case–control study design. Setting A drug misuse treatment centre in Taiwan. Participants Eighty-eight male AHMs and 48 male controls. Measurements Four parameters representing the attention to wins, learning rate, response sensitivity and incentive of heroin-related stimuli from the modified Go/NoGo discrimination task. Findings A modified cue-dependent learning (CD) model with four parameters representing attention to wins, learning rate, response sensitivity and incentive of heroin-related stimuli had a lower value of the sum of Bayesian information criterion (showing a better fit) than the original CD model (9555.50 versus 11 192.22, P