Properties of Visual Working Memory Representations as Examined by Memory-Perception Comparison Process

시각 작업 기억에 저장되는 정보의 표상 특성을 조사하기 위해, 변화 탐지 과제에서 기억 항목과 검사 항목이 비교되는 과정을 사건 관련 전위 측정법을 통해 관찰하였다. 피험자는 기억 항목으로 제시된 막대들의 방위 변화를 검사 항목과의 비교를 통해 탐지하도록 요구되었으며, 각 변화 탐지 시행 내에서 기억해야 할 항목의 개수는 1~6개로 변화되었다. 기억과 검사 항목 간 차이에 의해 촉발되는 주의 전환 시점을 N2pc 성분의 발현 시간을 통해 추정한 결과, 항목 개수 증가에 관계없이 주의 전환 시점은 일정하였다. 이는 기억과 검사 항목 간 비교 처리 과정이 매우 신속하며 즉각적으로 수행됨을 의미하며, 기억에 저장된 정보의 표상이 3~4개의 독립된 고정해상도 슬롯들에 저장됨을 시사한다.

keywords: 시각작업기억, 변화 탐지, 비교, N2pc, 고정해상도 슬롯, visual working memory, change-detection, comparison, N2pc, fixed-resolution slot, visual working memory, change-detection, comparison, N2pc, fixed-resolution slot

Abstract

To examine properties of visual working memory (VWM) representations, event-related potentials were measured during the comparison process between memory and perception in a change-detection task. Subjects were asked to detect an orientation change upon a memory display onset after remembering a few orientation bars, and the memory set size was varied from 1 to 6. Onset latencies of attention shift triggered by a memory-perception difference were measured by N2pc component onset time, and the latencies were constant regardless of the number of items in the display. The results indicate that the comparison between VWM representations and perceptual inputs occurs very rapidly and is accomplished immediately upon a test display onset, and further that the representations in VWM are stored into 3-4 fixed-resolution slots.

keywords: 시각작업기억, 변화 탐지, 비교, N2pc, 고정해상도 슬롯, visual working memory, change-detection, comparison, N2pc, fixed-resolution slot, visual working memory, change-detection, comparison, N2pc, fixed-resolution slot

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논문 상세

Vol.21 No.4

기억 표상과 지각적 입력 간 비교 과정을 통해 본 시각작업기억 표상의 특성

Properties of Visual Working Memory Representations as Examined by Memory-Perception Comparison Process

초록

Abstract

참고문헌

한국심리학회지: 인지 및 생물