3차원 깊이 변화 탐지과정에서 드러난 시야와 양안의 상호작용효과 = Interaction Effect between Visual Field and Eye on 3-D Movement Perception

국문 초록 (Abstract)

시각 정보가 제시되는 눈과 좌우 시야의 위치를 조합하면 망막에서부터 형성되는 네 가지 시각경로를 분리하고 이를 행동적으로 측정할 수 있다. 본 연구는 3차원 깊이 지각 과정에 눈과 시야, 좌우뇌가 차별적인 기여를 할 가능성을 구분해서 알아보고자 하였다. 이를 위하여 두 눈에서 오는 정보를 모두 필요로 하는 깊이 변화 판단 과제를 구성하였다. 좌우 시야의 위치와 제시되는 눈의 조건을 독립적으로 조정하여 깊이 변화를 탐지하기 위한 정보를 관찰자에게 체계적으로 제공하였다. 정보가 조합되는 조건에 따라 수행차이가 있는지를 반응시간으로 측정하였다. 실험 참가자는 가상의 두 원주(작은 원, 3.43°; 큰 원 8.13°) 상에 제시된 12개의 자극 중 어느 하나에서 깊이 변화가 탐지되면 다가오거나 멀어지는 변화의 방향에 따라 적합한 반응을 하도록 하였다. 결과로는 자극의 공간 이동 방향, 깊이 탐지 정보가 제시되는 눈과 시야에 따라 탐지 수행이 달라지는 것으로 나타났다. 또한 변화의 방향에 대한 좌우 손 반응 요구를 상호 뒤바꾸는 두 실험조건에서 수행 안정성의 차이가 관찰되었다. 이런 결과는 3차원 깊이 지각 과정이 정보가 입력되는 시각 경로가 동측인지 대측인지에 따라 차이날 수 있으며, 자극에 대한 행동 반응의 적절성은 깊이 변화 방향과 밀접한 관련이 있을 가능성을 논의하였다.

다국어 초록 (Multilingual Abstract)

It is investigated whether the visual pathway starting from retina could be separated and measured behaviorally. It could be possible to separate visual pathways with four combinations of left/right visual fields and viewing eyes. 12 spheral stimuli along two imagery concentric circles were presented against dark background, and then one of stimulus was shifted rightward or leftward. Since a stimulus shift occurred on one of two visual displays viewed exclusively by one of two eyes, an observer perceived it as shifted its depth position closer or further away. We manipulated the stimulus shifting conditions, consisting of viewing eyes, visual fields, stimulus shifting directions, and measured observers’ reaction time performance as promptness to its change. Several interaction effects among visual fields, viewing eyes, and shift directions were obtained to show that there could be a performance difference between contralateral and ipsilateral visual pathway of the 3-D related information processing. In addition, the interaction effect with response assignment might be caused by the natural human response tendency to the 3-D motion direction.

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