- 권한신청
- P-ISSN1226-9654
- E-ISSN2733-466X
- KCI
피드백 학습능력의 개인차와 두뇌 회백질 부피: 형태분석 연구
Individual differences in feedback learning and regional gray matter volume
강은주 (강원대학교)
초록
성공적인 피드백 학습은 자극-반응-결과의 반복적 경험을 바탕으로 행동을 지속해서 수정(습득)하는 능력과 지연 후 학습하였던 연합을 인출(기억)하는 능력과 관련 있을 것이다. 본 연구에서는 S-R 학습과제에서 획득된 이 두 가지 측면의 개인 차이와 관련된 두뇌 해부학적 신경실질을 조사하기 위해 부피소-기반 형태분석법(voxel-based morphometry)을 사용하였다. 정상인(N=22; M/F = 4/18)의 고해상도 자기공명영상(MRI)에서 얻은 회백질 영상에 학습률과 기억률을 공변인으로 중다회귀분석을 각각 실시하였다. 그 결과, 자극-반응 쌍의 연합 습득 능력을 반영하는 학습률은 주의 통제에 관여한다고 알려진 좌측 상두정영역(superior parietal region)의 회백질의 부피와 정적 상관이 있었다. 반면, 자극-반응 연합의 성공적인 인출과 관련한 기억률이 장기기억형성에 관여한다고 알려진 우반구 후측 해마(posterior hippocampus)의 회백질 부피와 정적 상관이 있음을 발견하였다. 본 결과는 피드백을 근거로한 S-R학습의 습득 능력과 기억수행 능력의 개인차이는 서로 다른 해부학적 구조에 근거할 가능성을 시사한다.
- keywords
- feedback based learning, memory, attention, VBM, parietal lobe, hippocampus, individual difference, 피드백 학습, 기억, 주의, VBM, 두정엽, 해마, 개인차
Abstract
Successful feedback learning relies on the individual's ability to consistently adjust behavior, based on repeated stimulus-response-outcome experiences, and ability to retrieve previously learned information from memory. The present study investigated the neuroanatomical bases of individual differences underlying two types of performance, acquisition and memory, during feedback based S-R learning, using voxel-based morphometry (VBM). Whole-brain structural magnetic resonance imaging (MRI, 3T) scans were obtained from healthy young subjects (N = 22: M/F = 4/18). Multiple regression analysis revealed that individual differences in learning rate were positively correlated with gray matter volume of the left superior parietal region, indicating that efficiency in acquisition may be associated with attentional control. The individual differences in memory rate were positively correlated with volume of the right posterior hippocampal region, which is known to be involved in formation of long-term memory. These results demonstrate a double dissociation between learning-acquisition and memory-performance.
- keywords
- feedback based learning, memory, attention, VBM, parietal lobe, hippocampus, individual difference, 피드백 학습, 기억, 주의, VBM, 두정엽, 해마, 개인차
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