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

초록

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.

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