The Effect of Unilateral Hand Contractions on Contralateral Frontal Activity and Affective Experience

본 연구는 일측성 손 수축 방법을 사용하여 정서기능에 있어서 전두피질의 비대칭성을 검증하기 위해 수행되었다. 실험참가자들은 통제집단, 좌측 손 수축집단 혹은 우측 손 수축집단으로 무선 배정되었다. 참가자들은 우선 기저선 EEG 측정을 받은 다음, 연습시행에서 EEG가 측정되는 동안 2회의 좌측 혹은 우축 손 수축 훈련을 받았다. 그 후에 EEG 활동이 기록되는 동안 참가자들은 해당되는 조건에 따라 좌측 손 혹은 우측 손을 수축한 상태에서 중립적, 긍정적 혹은 부정적 정서자극에 노출되었고, 각각의 정서자극이 종료될 때마다 주관적으로 느끼는 정서를 보고하였다. 그 결과 우측 손의 수축은 우측 피질에 비해 좌측 피질의 활성화를 증가시킨 반면에, 좌측 손의 수축은 좌측 피질에 비해 우측 피질의 활성화를 증가시켰다. 또한 우측 손의 수축은 좌측 손의 수축에 비해 중립적 및 긍정적 정서자극에 대해 긍정적 정서경험을 증가시켰다. 그러나 기저선과 정서자극이 제시되는 동안 측정된 중전두피질영역의 비대칭성만이 긍정적 정서경험과 유의한 관련성이 있었다. 이 결과는 일측성 우측 손 수축이 좌측 중전두피질의 활동을 증가시키고, 이에 따라 긍정적 정서경험이 증가한다는 사실을 시사한다. 그리고 일측성 손 수축 조작에 따른 중전두영역의 비대칭성이 다른 영역의 비대칭성 및 정서특질로서의 기저선 비대칭성과 어느 정도 독립적이라는 견해가 논의되었다.

keywords: unilateral hand contraction, electroencephalogram, emotional news, mid-frontal asymmetry, affective traits., 일측성 손 수축, 비대칭성, 긍정적 정서반응, 중전두피질영역, 정서특질

Abstract

This study investigated the emotional function of frontal cortex asymmetry using unilateral hand contractions paradigm. Participants were randomly assigned to control, left-hand or right-hand contraction groups. Electroencephalogram(EEG) was recorded during 4 1-min baselines and two consecutive 45-s left or right hand contractions trial. Following the hand contraction practice trials, participants contracted the right or left hand during hearing the emotional news and EEG activity was also recorded. The results indicated that right-hand contractions produced greater left than right hemispheric activity, whereas left-hand contractions produced greater right than left hemispheric activity. Right-hand contractions increased positive emotional experience to both neutral and positive news editorial, compared to left-hand contraction. This results supported the hypothesis that the increase in relative left frontal cortical activation due to right-hand contraction was related to more self-reported positive affect. It was discussed that the mid-frontal asymmetry effect produced by the hand contraction manipulation is somewhat independent of the other asymmetry effects and the baseline asymmetry effect as affective traits.

keywords: unilateral hand contraction, electroencephalogram, emotional news, mid-frontal asymmetry, affective traits., 일측성 손 수축, 비대칭성, 긍정적 정서반응, 중전두피질영역, 정서특질

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논문 상세

Vol.21 No.4

일측성 손 수축이 대측 전두피질의 활동성과 정서경험에 미치는 효과

The Effect of Unilateral Hand Contractions on Contralateral Frontal Activity and Affective Experience

초록

Abstract

참고문헌

한국심리학회지: 인지 및 생물