Kooi F L, De Valois K K, Grosof D H, De Valois R L
University of California, Berkeley.
Percept Psychophys. 1992 Oct;52(4):415-24. doi: 10.3758/bf03206701.
We have examined the human ability to determine the direction of movement of a variety of plaid patterns. The plaids were composed of two orthogonal sine-wave gratings. When the plaid components are of unequal spatial frequency or sometimes of unequal contrast, observers judge the direction of movement incorrectly. In terms of the two-stage model of Adelson and Movshon (1982), these errors may result from either a misjudgment in the perceived speeds of each of the components or a failure in the combination of one-dimensional component movements into a coherent direction of motion of the two-dimensional plaid pattern, or both. A comparison of the perceived direction of motion of plaids with the relative perceived speeds of the plaid component gratings suggest that both failures occur, but in different circumstances. The relative perceived speed of the plaid components was measured with a spatial and a temporal forced-choice technique, the former leading to larger differences. Our results support the notion that the visual system decomposes a moving plaid into oriented components and subsequently recombines the component motions.
我们研究了人类判断各种格子图案运动方向的能力。这些格子由两个相互正交的正弦波光栅组成。当格子的组成部分具有不等的空间频率，或者有时具有不等的对比度时，观察者会错误地判断运动方向。根据阿德尔森和莫夫尚（1982年）的两阶段模型，这些错误可能源于对每个组成部分感知速度的错误判断，或者源于一维组成部分运动未能组合成二维格子图案的连贯运动方向，或者两者皆有。将格子图案的感知运动方向与格子组成光栅的相对感知速度进行比较表明，这两种失误都会发生，但发生在不同的情况下。通过空间和时间强制选择技术测量了格子组成部分的相对感知速度，前者导致的差异更大。我们的结果支持这样一种观点，即视觉系统将移动的格子分解为有方向的组成部分，随后重新组合这些组成部分的运动。
