Motivational contingencies may improve or worsen our executive functioning. The effects of reward on behavior have been widely studied and may be involved in the physiopathology of obsessive-compulsive disorder (OCD). Nonetheless, it is not known (i) which are the brain systems modulating the interactions between executive and motivational processes, (ii) how these are modulated by individual differences in reward sensitivity, and (iii) which is the relevance of these processes in the context of OCD. This project aims to analyze the brain correlates of the interaction between cognitive and motivational processes in OCD, considering individual differences in personality. Specifically, we intend to shed light over the brain mechanisms underlying individual differences in the Brain Activation System (BAS)(Gray, 1987), which modulates the interaction between these processes, and to explore whether the impulse control deficits present in OCD may be better understood from this perspective.