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KMID : 1177320150180010021
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Korean Journal of Schizophrenia Research
2015 Volume.18 No. 1 p.21 ~ p.27
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Characteristics of Self-Other Boundary Recognition Using Morphed Face Pictures in Patients with Schizophrenia
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Oh Seong-Taek
Hong Yeon-Ju
Shin Yu-Bin
Yoon Hyung-Jun
Sun Ja-Yeun
Kim Dae-Hyun
Kim Jae-Min
Kim Jae-Jin
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Abstract
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Objectives: Disturbance in self-experience has been considered to be a core feature of schizophrenia. Evidence from mirror face-recognition tasks supports the connection between self-face recognition and self-awareness which is a part of self-experience. The aim of this study was to investigate the self-other boundary recognition using morphed face pictures in patients with schizophrenia.
Methods: Twenty-one patients with schizophrenia and twenty-three healthy controls completed the self-face recognition task that consisted of various morphed pictures. Participant’s own picture was morphed with each of three different, unknown, gender-matched facial identities in steps of 10% ; each pair producing 11 images with graded blending of facial features. Thirty-three images in total were randomly presented as stimuli in a run, which was repeated three times. Participants were instructed to choose whether the stimulus was self-face or not.
Results: Self-face proportion was significantly lower in the schizophrenia group at both recognition start point I and II (33.33% vs. 53.04%, p<0.001 ; 61.43% vs. 70.87%, p=0.01, respectively). Using the mean value of each recognition start point in the control group, we calculated the difference in self-face proportion for each individual with schizophrenia. There was a significant correlation between the degree of this difference and total Scale for the Assessment of Negative Symptoms (SANS) score at recognition start point I (r=0.507, p=0.019).
Conclusion: The difference in self-other boundary recognition in this study may account for self-disturbance of schizophrenia. Its correlation with SANS total score may reflect the shared nature of persistent disturbance between the disturbance in self-experience and the negative symptom.
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KEYWORD
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Schizophrenia, Self-experience, Self-other boundary, Negative symptom
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