정상인에서 양가감정과 관련된 뇌 영역 : 양전자방출단층촬영 상관 연구
Brain Regions Associated with Ambivalence in Healthy Adults : A PET Correlation Study
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본 연구의 목적은 정신분열형 양가가정 척도의 한국판을 이용하여 정신분열형 양가감정과 연관있는 뇌 영역을 알아보고자 하였다. 특히, 본 연구는 이미 발병한 정신분열병 환자에게 존재하는 양가감정을 대상으로 하지 않고, 정상인에게 존재하는 정신분열병의 소질성향으로서의 양가감정을 탐색하고자 하였다. 그 결과, 정신분열형 양가감정 변인은 좌측 해마옆이랑 및 뇌궁 술의 대사와 양의 상관관계를, 정서표현의 양가감정 변인은 우측 조가비핵의 대사와 음의 상관관계가 있는 것으로 각각 관찰되었다. 한편, 정서인식 변인은 좌측 뇌섬 및 해마옆이랑을 비롯한 다양한 뇌 영역의 대사와 양의 상관관계가 있는 것으로 나타났다. 결론적으로 정신분열병의 소질성향으로서의 양가감정과 정상적으로 경험할 수 있는 양가감정이 서로 다른 뇌 영역과 연관을 맺고 있는 것으로 나타났으며, 특히 정신분열형 양가감정은 정신분열병의 정보처리 이상과 연관이 있다고 알려져 있는 해마연결체와 연관이 있는 것으로 나타났다.
Abstract
Objectives: The present study investigated the brain regions that correlate with ambivalence in schizotypy, a latent personality organization that is proposed to precede and contribute to the liability of developing schizophrenia. Methods: Using 18F-FDG PET scan, we investigated the brain activity of twenty one normal healthy subjects during resting state. Questionnaires, including the Korean Version of Schizotypal Ambivalence Scale (K-SAS), were administrated after the scan in order to assess the self-rated individual differences in ambivalence. Results: The subjects’ Schizotypal Ambivalence Scale (SAS) scores showed positive correlation with metabolic rates in the left parahippocampal gyrus and fornix. In contrast, the subjects’ Ambivalence over Expression of Emotion Questionnaire (AEQ) scores showed negative correlation with metabolic rates in the right putamen. Although scores of the two ambivalence scales correlated positively (Pearson correlation coefficient 0.477, p<0.050), there was no substantial overlap between the neural correlates. Conclusion: This study suggests that the hippocampal complex, which dysfunction has been reported to correlate with impaired information processing in schizophrenia, may underlie schizotypal ambivalence.
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