Gros B L, Pope D R, Cohn T E
Vanderbilt Vision Research Center, Nashville, TN 37420, USA.
Vision Res. 1996 Aug;36(15):2297-302. doi: 10.1016/0042-6989(95)00259-6.
We measured the relative efficiency for motion and position discriminations of brief, localized spot stimuli with a technique that makes no assumptions about sites of noise or information loss in the visual system. In one task, the observer had to discriminate whether an increment was located at one (left) or another (right) closely spaced spots. In the other task, the observer had to discriminate two successive brief increments of the left spot from a left spot increment followed by a right spot increment. Ideal observer theory predicts identical performance on the two tasks. Observers' thresholds, however, were significantly lower in the motion task at all intervals between flashes (ISIs) less than 60 msec in one observer and all ISIs less than 150 msec in two other observers (P < 0.01, t-test). We conclude that this apparent motion stimulus is seen more efficiently than a non-moving stimulus, and that the higher efficiency may be due to use of a motion sensitive channel in addition to independent position sensitive channels.
我们使用一种对视觉系统中噪声或信息损失部位不做任何假设的技术，测量了短暂、局部点状刺激在运动和位置辨别方面的相对效率。在一项任务中，观察者必须辨别增量是位于一个（左侧）还是另一个（右侧）紧密间隔的点上。在另一项任务中，观察者必须将左侧点的两个连续短暂增量与左侧点增量后接右侧点增量区分开来。理想观察者理论预测这两项任务的表现相同。然而，在一名观察者中，对于所有小于60毫秒的闪光间隔（ISI），以及在另外两名观察者中，对于所有小于150毫秒的ISI，观察者在运动任务中的阈值在所有间隔下都显著更低（P < 0.01，t检验）。我们得出结论，这种表观运动刺激比非运动刺激的视觉效率更高，并且更高的效率可能是由于除了独立的位置敏感通道外，还使用了运动敏感通道。
