Test of Comparison Process in Visual Working Memory by Consolidation Masking

변화 탐지 과제(change-detection task)에서 시각 작업 기억에 저장된 정보는 감각 기관을 통해 유입되는 정보와 비교(comparison)되는 과정을 필요로 한다(Hyun 2006). 본 연구에서는 검사 항목이 제시된 직 후 차폐 자극을 제시하여 차폐에 의한 변화 탐지 정확도의 변화와 검사 항목에 의해 유발된 사건 관련 전위의 변화를 조사하였다. 피험자는 색상을 서로 달리하는 네 개의 정사각형과 뒤이어 제시된 또 다른 네 개의 정사각형간 색상 변화의 유무를 보고하는 변화 탐지 과제를 수행하였다. 검사 자극이 사라진 후 약 17ms 후 색상 차폐 자극이 각 사각형의 위치에 제시되었다. 변화 탐지 정확도는 차폐 자극이 제시된 조건에서 저하되었으며, 검사 자극에 의해 유발된 사건 관련 전위(N2pc) 또한 그 발현 정도가 현저히 저하되었다. 이는 검사 자극에 뒤이어 제시된 패턴 차폐 자극이 작업 기억에 저장된 정보를 감각 표상과 비교하는 과정을 방해함을 의미한다.

keywords: change-detection task, visual working memory, comparison, masking, ERPs, 변화 탐지 과제, 시각 작업 기억, 비교, 차폐, 사건 관련 전위

Abstract

Change-detection necessitates comparison of visual working memory (VWM) representations with perceptual inputs (Hyun, 2006). The current study tests masking interference with consolidation of test items being compared with sample items in memory. Subjects performed a change-detection task where they were asked for reporting a color change between two sets of colored boxes. In masking trials, complex pattern masks were presented at each item position 17ms after the test display disappeared. Change-detection performance was worse in masking trials than no-masking trials, and Event-related potentials (N2pc) was virtually absent when masks were present. The interference effect observed both behaviorally and electrophysiologically supports for the presence of a comparison process between memory and perceptual inputs.

keywords: change-detection task, visual working memory, comparison, masking, ERPs, 변화 탐지 과제, 시각 작업 기억, 비교, 차폐, 사건 관련 전위

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논문 상세

Vol.20 No.3

차폐 자극이 시각 작업 기억 비교 과정에 미치는 영향

Test of Comparison Process in Visual Working Memory by Consolidation Masking

초록

Abstract

참고문헌

한국심리학회지: 인지 및 생물