비순응 영역으로의 운동 잔여효과의 번짐에 미치는 삼차원 깊이 불연속의 효과
The effect of depth discontinuity on spreading of motion aftereffect to non-adapted area
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운동자극에 오랫동안 노출된 이후 해당 자극이 제시된 망막상의 영역에 제시된 정지 자극은 운동 자극의 방향과는 반대방향으로 움직이는 것으로 지각되는 운동 잔여효과(motion aftereffect: MAE)가 발생한다. 본 연구에서는 운동순응에 의해 발생된 운동 잔여효과가 인접 비순응 영역에까지 번져나가는 현상이 양안 시차에 의해 깊이가 다른 표면에서도 발생하는 지를 살펴보았다. 동심원의 고리부분에만 운동순응을 시킨 후, 실험 1에서는 양안 시차에 의한 경사 표면을 중앙 비순응 영역에 제시했고 실험 2에서는 양안시차에 의해 깊이가 다른 정면평행 표면(fronto parallel plane)을 중앙 비순응 영역에 제시하였다. 경사 표면인 경우 주변 순응영역과 깊이가 동일한 비경사조건에서의 MAE지속시간과 유사한 반면, 깊이가 다른 정면 평행 표면에서는 동일 깊이 조건보다 MAE 지속시간은 줄어들었지만 완전히 사라지지는 않았다. 이러한 결과는 MAE의 번짐 현상이 깊이 불연속 정보에 의해 영향 받는다는 것을 보여줄 뿐만 아니라 양안정보가 합치된 이후에도 발생될 수 있음을 시사한다.
Abstract
The stationary image appears to move after we view a moving stimulus for a long time. The motion aftereffect(MAE) can spread to an adjacent region if there is no contrast discontinuity between two regions. In this study, it is investigated whether a phenomenon of MAE spreading to an adjacent non adapting area is affected by the depth discontinuity defined by binocular disparity. In the first experiment a disparity defined slanted pattern was presented in an unadapted region, and in the second experiment, a disparity defined pattern with a different depth was presented on the fronto-parallel plane. Although MAE duration in the condition with slanted pattern was not different from that in the non-slanted pattern condition, MAE durations in the pattern presented on pronto-parallel plane was vividly reduced, but not completely disappeared. These results suggest that a phenomenon of MAE spreading might be affected by depth discontinuity, and could be occurred after binocular information converges.
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