Aim: As suggested by the Shared Vulnerability Model, impairment in executive functions could lead to worse creative performance among individuals with schizophrenia. Another impaired function in schizophrenia, previously related to creativity in healthy people, is theory of mind. However, little is known about the effect of theory of mind in creativity in schizophrenia. Therefore, the aim of this study was to analyze differences in creativity among patients with schizophrenia compared to healthy controls (HC) and to explore the potential role of executive functions and theory of mind as mediators of this relation.
Methods: Forty-five patients with schizophrenia and 45 HC underwent a neuropsychological assessment, including executive functions (cognitive flexibility and working memory), theory of mind, and verbal and figural creativity.
Results: As expected, patients with schizophrenia obtained lower scores in creativity, cognitive flexibility, working memory, and theory of mind compared to HC. Path analysis showed that theory of mind mediated the relation between group (schizophrenia or HC) and both figural (Z = 2.075, P = 0.037) and verbal creativity (Z = 2.570, P = 0.010). Working memory mediated the relation between group and figural creativity (Z = 2.034, P = 0.041) and was marginally significant for verbal creativity (Z = 1.930, P = 0.053). Finally, cognitive flexibility mediated between group and figural creativity (Z = 2.454, P = 0.014).
Conclusion: Results suggest that the lower performance in creativity among patients with schizophrenia was partly due to an impairment in executive functions and theory of mind. The involvement of theory of mind opens up a new field of research as a possible risk factor in the Shared Vulnerability Model.
Keywords: cognition; creativity; executive function; schizophrenia; theory of mind.
© 2019 The Authors. Psychiatry and Clinical Neurosciences published by John Wiley & Sons Australia, Ltd on behalf of Japanese Society of Psychiatry and Neurology.