시야 중앙의 시각단기기억 처리가 주변 시야의 감각적 변화탐지에 미치는 영향
The Influence of Visual Short-term Memory Process on Detection of a Peripheral Sensory Change
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시각단기기억에 기초한 변화탐지 처리 과정은 기억항목에 대한 공고화 및 유지 그리고 검사항목에 대한 비교 처리를 요구한다. 본 연구에서는 이 세 과정에 요구되는 정보처리 자원의 양이 서로 다를 수 있음을 가정하고, 시야 중앙에 제시된 시각단기기억 기반 변화탐지 과제와 주변 배경 시야의 감각적 변화에 대한 탐지 과제 간 수행 간섭 여부를 조사했다. 그 결과 중앙의 변화탐지 과제(기억기반 과제)와 주변 시야의 변화탐지 과제(지각기반 과제) 간 간섭은 기억항목의 출현 인접 시점에 비해 검사항목이 출현한 시점에 가장 감소한 것이 관찰되었다. 이 결과는 시각단기기억 기반 변화탐지 과정에서 공고화 및 유지 과정에 비해 비교 처리 과정에 요구되는 정보 처리 자원의 양이 상대적으로 적은 것을 시사한다.
Abstract
Change detection process based upon visual short-term memory (VSTM) requires consolidation and maintenance of memory items as well as their comparison against test items. Assuming that the amount of information-processing resources may be different for these three processes, the present study examined presence or absence of performance interference between VSTM-based change detection task at the center of display and a sensory change detection task at periphery. The results showed that less interference between the central change-detection (i.e., memory-intensive) task and peripheral sensory change-detection (i.e., perception- intensive) task was observed near the time the test items were displayed than around when the memory items were displayed. The results indicate that the amount of information-processing resources required for the comparison process is relatively small compared to the consolidation or maintenance process during the VSTM-based change detection.
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