깊이 맥락이 맹점 채우기에 미치는 영향
The Influence of Depth Context on Blind Spot Filling-in
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참고문헌
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초록
본 연구는 두 정신물리학 실험을 통하여 상향적(bottom-up) 정보와 하향적(top-down) 정보가 맹점 채우기에 미치는 영향을 검증하였다. 두 실험 모두에서 맹점에 채워질 가능성이 동일한 두 자극을 맹점에 제시하였다. 이 두 자극이 맹점을 채우기 위해 경쟁할 때, 그 중 한 자극의 깊이 맥락을 조작하여 상향적 요인과 하향적 요인의 상호작용을 살펴보았다. 깊이 맥락은 맹점에 채워지는 자극들과 맹점 주변부 자극들 간의 상대적인 깊이로 정의되었으며, 실험 참가자들은 맹점에서 채워진 표적의 지각적 깊이를 보고하였다. 실험 결과, 맹점이 상향적 정보만 가진 자극보다 하향적 정보인 깊이 맥락이 첨가된 자극으로 대부분 채워졌다는 사실을 발견하였다. 통제 실험을 통하여 이러한 깊이 지각은 맹점이 위치한 주변시의 해상력 때문은 아닌 것으로 밝혀졌다. 위와 같은 실험 결과는 깊이 맥락정보와 같은 하향 처리 과정도 맹점 채워 넣기 과정에 영향을 미친다는 것을 시사한다.
Abstract
This study investigated whether top-down information influenced the filling-in of the blind spot. Two potential stimuli, which could fill in the blind spot, were presented at the location of the blind spot. When the two stimuli competed against each other to fill in the blind spot with equal probability, the depth-context of one of the stimuli was manipulated. We used an overlapping cue as our depth-context. Participants' task was to report the relative depth of a target presented in the blind spot. We found that the overlapping cue influenced the frequency of reported depth. These results, however, were not observed in the off blind spot. These results suggest that top-down information such as an overlapping cue influences the filling-in of the blind spot.
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