Schizophrenia Bulletin Advance Access originally published online on May 21, 2008
Schizophrenia Bulletin 2008 34(4):698-707; doi:10.1093/schbul/sbn048
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Imitation, Simulation, and Schizophrenia
2 Department of Psychology
3 Department of Psychiatry
4 The Kennedy Center for Research on Human Development, Vanderbilt University, Nashville, TN, USA
1 To whom correspondence should be addressed; Department of Psychology, Wilson Hall, Vanderbilt University, 111, 21st Avenue South, Nashville, TN 37240, USA; tel: +1-615-322-3435, fax: +1-615-383-8449, e-mail: sohee.park{at}vanderbilt.edu.
The social significance of imitation is that it provides internal tools for understanding the actions of others by simulating or forming internal representations of these actions. Imitation plays a central role in human social behavior by mediating diverse forms of social learning. However, imitation and simulation ability in schizophrenia has not been adequately addressed. The major aim of the present study was to investigate imitation ability in schizophrenia patients and healthy individuals by examining simple motor imitation that involved the replication of meaningless manual and oral gestures, and the imitation of emotional facial expressions, which has implications for mentalizing. A secondary aim of the present study was to investigate the relationships among imitation ability, social functioning, and working memory. Subjects were asked to mimic hand gestures, mouth movements, and facial expressions of others, online. Clinical symptoms, social competence, and working memory were also assessed. Patients with schizophrenia were significantly impaired on all imitation tasks. Imitation errors were significantly correlated with reduced social competence and increased negative symptoms. However, imitation ability was only weakly associated with working memory. To summarize, the present study examined the ability of patients with schizophrenia to imitate the behaviors demonstrated by others. The results indicate a fundamental impairment in imitation ability in schizophrenia and implicate a possible difficulty in simulation. Further research to determine the neural and developmental origins of this difficulty could be extremely helpful in elucidating the role of simulation in schizophrenia and to establish the complex relationships among mental representation, imitation, and social cognition.
Keywords: imitation / simulation / mirror neuron / social cognition / schizophrenia / theory of mind / working memory / mentalizing / mind reading
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