People spend much of their time within social groups but those with schizophrenia commonly describe difficulty with trusting others. Using a public goods game to study social interactions in individuals with the disorder, it was seen that when a lack of cooperation was punished, both patients and control subjects demonstrated increased levels of cooperation.

This suggests that the lack of cooperation in people with schizophrenia within a group setting is not fixed but is amenable to change and treatment could usefully be targeted at this.

Cooperative behaviour

To investigate how cooperative behaviour differed between the two groups, the researchers recruited 27 patients with schizophrenia and 27 healthy controls and got them to play a public goods game that included a social dilemma: participants received an initial endowment and had to make the decision whether to invest the money in a group account (cooperating/public good) for mutual benefit or whether to keep the money for themselves (non-cooperation/private good), yet still benefit from the others contributions.

There were two conditions, one where no fine was possible and one where participants could punish (fine) the other players for non-cooperation of the other players. When players are allowed to punish non-cooperators, investments in the public good tend to increase as cooperation is socially enforced.

Social group interactions

The study, which is published in the journal Schizophrenia Research, is the first to investigate cooperation, social enforcement and sensitivity to social feedback in group interactions in schizophrenia.

Co-author Dr. Anne-Kathrin Fett, from the Department of Psychology at City, University of London, said:

“We used a paradigm from behavioural economics to study social interaction in schizophrenia in this interdisciplinary project. The use of behavioural economics to study social mechanisms in psychiatric disorders is novel and allows us to investigate mechanisms of social interaction while they take place, as opposed to using questionnaires asking hypothetically about what you would do if you were in a social interaction.

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