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인터넷게임 과사용자의 성격 관련 신경해부학적 특질: 부피소-기반 형태 연구

Neuroanatomical Correlates of Personality Traits for Internet Gaming Overuse: a VBM study

한국심리학회지: 일반 / Korean Journal of Psychology: General, (P)1229-067X; (E)2734-1127
2017, v.36 no.1, pp.109-135
https://doi.org/10.22257/kjp.2017.03.36.1.109
김진희 (Univ. of Toronto)
강은주 (강원대학교)
김학진 (고려대학교)
조희연 (강원대학교 심리학과)
정호진 (강원대학교 심리학과)
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초록

본 연구는 부피소-기반 형태분석법(voxel-based morphometry)을 이용하여 인터넷게임장애의 잠재적 위험군인 인터넷게임 과사용 집단의 심리적 특성과 더불어 관련된 회백질의 미세구조 변화를 알아보고자 수행되었다. 이를 위해 인터넷게임 과사용 집단(n = 18, 평균 연령 22.2 ± 2.0세)과 대조집단(n = 20, 평균 연령 21.2 ± 2.2세)의 고해상도 구조적 T1 영상을 획득하여 집단 간 회백질 부피 차이를 검증하고 성격 특질과의 관련성을 조사하였다. 그 결과, 대조집단에 비해 인터넷게임 과사용 집단의 양측 일차운동 피질의 회백질 부피가 유의하게 크다는 것이 관찰되었다. 또한, 성격 특질 중 충동성과 보상민감성의 개인 차이에 따른 두뇌 회백질의 부피 변화는 인터넷게임 과사용 집단에서만 좌측 소뇌 회백질 부피의 감소, 그리고 양측 편도체 및 우측 쐐기전소엽의 회백질 부피 감소 경향으로 각각 관찰되었다. 본 연구는 인터넷게임 과사용자 집단에서 게임 활동과 관련된 일차운동피질의 구조적 적응이 나타났음을 보였다. 인터넷게임 과사용 집단의 성격 특성과 회백질 부피 간의 관련성에 관한 본 연구의 발견은 인터넷게임장애가 반응 억제 및 보상처리의 신경해부학적 결함과 관련될 가능성을 시사한다.

keywords
인터넷게임 과사용, 충동성, 보상민감성, 회백질 부피, 운동피질, Internet gaming overuse, impulsivity, reward responsiveness, gray matter volume, primary motor cortex

Abstract

The neuroanatomical correlates of personality traits in individuals with internet gaming overuse were investigated using voxel-based morphometry (VBM). High-resolution T1-weighted whole-brain images and questionnaires measuring impulsivity, depression, and personality traits were collected from 18 young male adults with internet gaming overuse (IOs; 22.2 ± 2.0 years) and 20 normal controls (NCs; 21.2 ± 2.2 years). We examined 1) the regional gray matter volume (rGMV) difference between groups and 2) group difference in the relationship between rGMV and the scores on the psychological tests. The IO group showed greater rGMV in the bilateral primary motor cortex, relative to the NC group. Significant interaction effects were found between personality traits and groups on rGMV, showing that the IO group exhibited negative correlations between impulsivity and rGMV in the left cerebellum, and between reward responsiveness scales and rGMV in the bilateral amygdala and right precuneus. These findings suggest a structural adjustment in the motor cortex due to internet gaming overuse, and structural abnormalities in brain regions associated with inhibitory motor control and reward processing for individuals at-risk for internet gaming disorder.

keywords
인터넷게임 과사용, 충동성, 보상민감성, 회백질 부피, 운동피질, Internet gaming overuse, impulsivity, reward responsiveness, gray matter volume, primary motor cortex

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