자극의 정서가가 조현병 환자의 작업기억수행에 미치는 영향: 예비연구
Influence of Emotional Stimuli on Working Memory in Schizophrenia: A Preliminary Study
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본 연구의 목적은 자극의 정서가가 조현병 환자의 작업기억 과제수행에 어떠한 영향을 미치는지에 대해 검증하는 것이었다. 조현병집단(N=11)과 연령과 성별을 짝지운 비교집단(N=11)을 대상으로, 일련의 자기보고식 질문지, 단축형 지능검사(K-WAIS)와 2-back 과제를 실시하였다. 2-back 과제는 두 부분, 즉 숫자를 제시한 2-back 과제와 행복, 분노 또는 중립의 얼굴표정을 포함한 정서자극 2-back 과제로 구성되었다. Mann-Whitney U test를 실시한 결과, 주관적 정서경험과 숫자 2-back 과제에서 집단 간 차이는 유의하지 않았다. 또한 정서자극 2-back 과제에서 부정 표정, 중립 표정에서 집단 간 정확반응율 및 반응시간의 차이가 유의하지 않았으나 긍정 표정의 정확반응율에서는 유의한 차이가 나타났다. 이러한 결과는 조현병집단이 비교집단보다 긍정 표정에 대한 정확반응의 저하를 시사한다. 본 연구의 제한점과 후속 연구에 대한 제언이 논의되었다.
Abstract
The purpose of the present study was to examine how emotional stimuli affect on working memory performance in schizophrenia. The participants were 11 patients with schizophrenia and 11 healthy control individuals who matched in gender and age. All participants performed several self-report, short form of Korean-Wechsler Adult Intelligence Scale(K-WAIS) and 2-back task. 2-back task was composed the general 2-back task as digit stimuli and the emotional 2-back task that was included happy, anger and neutral facial expressions. The results was no significant difference of subjective experience of emotion and general 2-back task performance between groups. In addition, there were no significant difference of correct response rates(%) and reaction time in the emotional 2-back task using negative and neutral facial expression stimulus between groups. However, there was a significant difference of correct response rate(%) in the emotional 2-back task using positive facial expression stimulus between groups. These results suggested that schizophrenia group was less accurate for positive stimuli than healthy control group. Limitations of the current study and suggestions for future research were discussed.
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