视觉掩蔽可基于知觉到的客体位置

利用flash—lag效应分离视觉掩蔽中客体的物理位置和知觉位置，以探讨掩蔽效应是否基于知觉到的客体位置。实验中掩蔽刺激做圆周运动，到某一位置时，目标刺激短时呈现，要求被试判断目标刺激（缺角菱形）的缺角方向。通过操作目标呈现时二者之间的相对位置，发现当二者物理位置不重合而知觉位置重合时掩蔽效应最大。该结果表明，视觉掩蔽可基于知觉到的客体位置。

Visual Masking Effect Depends on the Perceived Locations of Objects

To explore whether visual masking effect depends on perceived locations of the target and mask objects, we adopted the ＇ flash-lag＇ paradigm to separate physical and perceived locations of the objects. Specifically,the target （a diamond with a missing angle）was presented near to the moving mask briefly. In this case, the mask could be perceptually overlapped on the target when they were physically separated. Ob-servers were asked to report which angle of the target was missing. The results show that the correct rate of target-identification reached the bottom point when the two objects were perceptually overlapped（but not physically overlapped）, suggesting that visual masking effect depends on objects＇ perceived locations.