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KMID : 0368820090480020086
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Journal of the Korean Neuropsychiatr Association
2009 Volume.48 No. 2 p.86 ~ p.91
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Theory of Mind Deficits in Schizophrenia Patients and Their First-Degree Relatives
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Lee Jeong-Im
Lee Seung-Hwan
Bae Sung-Man
Kim Seung-Yeon
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Abstract
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Objectives: Theory of mind (ToM) is the ability to conceptualize other people’s mental states in order to explain their behavior. This study compared the ToM ability of schizophrenia patients, their first-degree biological relatives, and healthy controls.
Methods: ToM animation test was administered to schizophrenia patients (N=28), their healthy first-degree relatives (N=26), and healthy controls (N=28). The Korean version of schizotypal personality questionnaire (SPQ) was used to assess the schizotypal personality trait of all three groups.
Results: Schizophrenia patients and their first-degree relatives showed decreased accuracy on ToM animation test compared to healthy controls [F(2,78)=29.75, p<.001]. Additionally, first-degree relatives performed worse than the control group and better than schizophrenia patients. First-degree relatives had similar SPQ scores compared to healthy controls but showed decreased ToM accuracy compared to healthy controls.
Conclusion: ToM deficits in schizophrenia patients are apparent. The ToM deficit in first-degree relatives of schizophrenia patients raises the possibility that ToM deficit may be a endophenotype for schizophrenia pathology.
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KEYWORD
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Theory of mind, Schizophrenia, Endophenotype, Schizotypal personality traits, First degree relatives
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