Using social outcomes to inform decision-making in schizophrenia: Relationships with symptoms and functioning.

The outcomes of the decisions we make can be used to inform subsequent choices and behavior. We investigated whether and how people with and without schizophrenia use positive and negative social outcomes and emotional displays to inform decisions to place trust in social partners. We also investigated the impact of reversals in social partners' behavior on decisions to trust. Thirty-two people with schizophrenia and 29 control participants completed a task in which they decided how much trust to place in social partners' showing either a dynamic emotional (smiling, scowling) or neutral display. Interactions were predetermined to result in positive (trust reciprocated) or negative (trust abused) outcomes, and we modeled changes in trust decisions over the course of repeated interactions. Compared to controls, people with schizophrenia were less sensitive to positive social outcomes in that they placed less trust in trustworthy social partners during initial interactions. By contrast, people with schizophrenia were more sensitive to negative social outcomes during initial interactions with untrustworthy social partners, placing less trust in these partners compared to controls. People with schizophrenia did not differ from controls in detecting social partner behavior reversals from trustworthy to untrustworthy; however, they had difficulties detecting reversals from untrustworthy to trustworthy. Importantly, decisions to trust were associated with real-world social functioning. We discuss the implications of these findings for understanding social engagement among people with schizophrenia and the development of psychosocial interventions for social functioning.

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