Bocheva Nadejda, Braunstein Myron L
Institute of Physiology, Bulgarian Academy of Sciences, 23 Acad. G Bonchev Street, BG 1113 Sofia, Bulgaria.
Perception. 2006;35(6):723-48. doi: 10.1068/p5013.
The effects of surface markings on perceived motion direction were examined for a rotating sphere in a structure-from-motion display. The markings were dot patterns representing separate line segments or intersecting line segments (crosses) covering the surface of the sphere. The orientation of the surface markings and their intersection angles affected the perceived direction of motion, suggesting that the markings were not interpreted as geodesics or planar cuts on the surface. The perceived direction of motion was biased towards the mean orientation of the markings over the visible area of the surface. A similar bias was observed for translating planar stimuli covered with crosses, suggesting that the bias is not specific to curved surfaces or motion in depth. The deviation between the simulated motion direction and the external horizontal and vertical axes also affected the perceived motion direction. These results suggest that the average orientation of surface contours with respect to an external reference frame influences the perceived direction of motion.
在由运动产生结构的显示中，研究了表面标记对旋转球体感知运动方向的影响。这些标记是代表覆盖球体表面的单独线段或相交线段（十字）的点图案。表面标记的方向及其交角影响了感知到的运动方向，这表明这些标记并未被解释为表面上的测地线或平面切割线。感知到的运动方向偏向于表面可见区域上标记的平均方向。对于覆盖有十字的平移平面刺激也观察到了类似的偏向，这表明该偏向并非特定于曲面或深度运动。模拟运动方向与外部水平和垂直轴之间的偏差也影响了感知到的运动方向。这些结果表明，表面轮廓相对于外部参考系的平均方向会影响感知到的运动方向。
