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Korean J Schizophr Res > Volume 18(1); 2015 > Article
Korean Journal of Schizophrenia Research 2015;18(1):21-27.
DOI: https://doi.org/10.16946/kjsr.2015.18.1.21    Published online April 30, 2015.
Characteristics of Self-Other Boundary Recognition Using Morphed Face Pictures in Patients with Schizophrenia.
Seung Taek Oh, Yeon Ju Hong, Yu Bin Shin, Hyung Jun Yoon, Ja Yeun Sun, Dae Hyun Kim, Jae Min Kim, Jae Jin Kim
1Department of Psychiatry, Yonsei University Gangnam Severance Hospital, Seoul, Korea. jaejkim@yonsei.ac.kr
2Institute of Behavioral Science in Medicine, Yonsei University College of Medicine, Seoul, Korea.
3Department of Psychiatry, Seongam Love Hospital, Seongnam, Korea.
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.
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.
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).
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.
Key Words: Schizophrenia · Self-experience · Self-other boundary · Negative symptom


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