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논문KCI 등재

예상외의 정서 자극으로부터 유발된 ERP 요소와 충동성의 관련성

Correlation between ERP components elicited by unexpected emotional stimuli and impulsivity

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참고문헌

키워드

주제분류심리과학

초록

충동성은 자신이나 타인에게 일어날 수 있는 부정적인 결과를 무시한 채, 내부 자극이나 외부 자극에 대해 빠르고 무계획적으로 반응하는 성향을 말한다. 충동적인 사람은 부적 정서를 통제하는데 곤란을 겪는 것으로 알려져 있다. 본 연구의 목적은 위협적이거나 중성적인 사진 자극을 일탈 자극으로 사용하여 3-자극 oddball 과제를 수행하고, 이때 유발되는 N2 및 P3 ERP 요소가 충동성 성향과 어떤 관련성을 보이는지를 알아보기 위한 것이다. 대학교에 재학 중인 50명의 학생들(남자 24명, 여자 26명)이 실험에 참가하였다. 본 연구의 결과에 의하면 무계획 충동성은 중성 자극 조건에서 N2 및 novelty P3 잠복기와 정적 상관이 있는 것으로 나타났으며, 위협 및 중성 자극 조건에서의 novelty P3 진폭과 유의한 부적 상관을 보였다. 이러한 결과는 무계획적 충동성이 높은 사람은 예상외의 정서 자극이 나타났을 때, 변화를 자동적으로 탐지하는데 느리고, 이에 대한 주의 집중 및 통제를 잘하지 못함을 나타낸다. 본 연구의 결과는 충동성이 높은 정상인 및 충동 조절 장애를 가진 사람들에게 있어서 정서 처리 결함이 초기 정보처리 과정에서부터 나타날 수 있음을 시사한다.

Abstract

Impulsivity is one of the personality trait in which someone tend to do things suddenly without any planning or careful consideration. In this study, we investigated the relation between impulsivity and N2/P3 component which is elicited by unexpected emotional stimulus. We used three-stimulus oddball paradigm to examine this relation. Total 50 college students (male: 24, female: 26) participated. Non planning impulsivity represented a negative correlation with peak amplitude of the novelty P3 component in both threat-stimulus and neutral-stimulus conditions. While in the N2 component, only peak latency showed a positive correlation to non planning impulsivity. These results indicate that non planning impulsivity influences on the speed of early involuntary cognitive process to the emotional stimulus and attentional modulatory capacity and speed of later voluntary cognitive process. But, with threat-related stimulus, there is no decrease in speed of early and late cognitive process, and the proper speed is maintained.

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