De Bruyn B, Orban G A
Department of Psychology, University of Surrey, Guildford, UK.
Perception. 1999;28(6):703-9. doi: 10.1068/p2769.
To compare transparent motion and kinetic boundaries with unidirectional motion, in many studies the relative motion is generated by superimposing or adjoining unidirectional motions oriented in opposite directions. The presumption, tacitly underlying this comparison, is that the two oppositely directed velocities are independent of one another as far as their speed is concerned, i.e. the speed of the relative motion is presumed to be equivalent to the speed of the unidirectional components. Here we report that the relative motion between dots moving in opposite directions augments perceived speed. A constant-stimuli procedure was used to pair transparent-motion or kinetic-boundary displays with unidirectional motion, and human observers were asked to match the speed of the relative and unidirectional motions. The results show that transparency and kinetic boundaries increase the perceived visual speed by about 50%, compared with the speed of the individual components.
为了将透明运动和动态边界与单向运动进行比较，在许多研究中，相对运动是通过叠加或邻接方向相反的单向运动而产生的。这种比较背后隐含的假设是，就速度而言，两个相反方向的速度彼此独立，即相对运动的速度被假定等同于单向分量的速度。在此我们报告，相向运动的点之间的相对运动会提高感知速度。采用恒定刺激程序将透明运动或动态边界显示与单向运动配对，并要求人类观察者匹配相对运动和单向运动的速度。结果表明，与单个分量的速度相比，透明运动和动态边界使感知到的视觉速度提高了约50%。
