가현운동 경로에서 발생되는 채움의 시공간적인 특성 = Spatiotemporal Properties of "Filling-in" process in Apparent Motion

다국어 초록 (Multilingual Abstract)

When the objects are presented successively in different locations, they evoke the perception of a single object moving between them, which is known as apparent motion(AM). Although the displacement of the object is discontinuous in AM, it is perceived as if the object moved along the smooth continuous path, suggesting that filling-in process might occur in the path of AM. To investigate the spatiotemporal properties of filling-in process in the path of AM, the correct discrimination rate was measured for the target stimulus presented either on- or off-the path of AM. In Experiment 1, SOA between target and the second motion frame was varied to examine the temporal characteristics of filling-in process. In Experiment 2, the spacial separation of the target was varied from the center of the path in order to examine the spacial characteristics of filling-in process. We found that the discrimination rate for the target on the center of the path was decreased when the target was presented at a temporal range of 40ms before or after the presence of the second stimulus in AM and that the decrease in discrimination rate was confined to a spatial region narrower than an imaginary path inferred from the contours of AM stimulus. The results suggest that filling-in process of apparent motion is formed very quickly within a restricted region along its central path.

국문 초록 (Abstract)

두 불빛이 각기 다른 위치에서 적절한 시간 간격을 두고 명멸하면 하나의 불빛이 경로를 따라 움직이는 것으로 지각된다. 가현운동이라 불리는 이 현상에서 물리적으로 제시되지 않은 경로가 지각된다는 사실은 모종의 채움이 발생됨을 시사한다. 본 연구에서는 가현운동 경로에서 채움이 발생되는지를 확인하고, 그 과정의 시공간적 특성을 살펴보기 위해서 두 장면 가현운동(two-frame apparent motion) 자극의 경로 안과 밖에 제시된 표적자극의 정확변별율을 측정하였다. 실험 1에서는 채움의 시간적 추이를 살펴보기 위해 표적자극의 제시 시간을 변화시켰고, 실험 2에서는 채움의 공간적 범위를 살펴보기 위해 표적자극의 제시 위치를 변화시켰다. 운동 자극의 둘째 장면의 제시 시점을 기준으로 -40ms에서부터 40ms 사이에서 경로 안에 제시된 표적자극의 정확변별율은 경로 밖에 제시된 표적 자극의 정확변별율보다 더 떨어지는 것으로 나타났다. 표적자극의 정확변별율 감소는 운동자극의 윤곽들로부터 추정할 수 있는 가상의 경로보다 좁은 공간적 영역에서만 발생되었다. 이러한 결과들은 가현운동의 경로에서 발생되는 채움은 제한된 공간적 범위 내에서 매우 빠른 시간 내에 발생되었다가 소멸됨을 시사한다.

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