Chopin Adrien, Mamassian Pascal
Laboratoire Psychologie de la Perception, Université Paris Descartes, Paris, France.
J Vis. 2011 Jun 24;11(7):18. doi: 10.1167/11.7.18.
Two sets of dots moving in opposite directions are usually seen as two transparent surfaces. Deciding which surface is in front of the other is bistable and observers exhibit strong biases to see one particular motion direction in front. Surprisingly, biases are dependent on stimulus orientation in a persistent, idiosyncratic, and irrelevant manner. We investigated here whether this preferred direction is arbitrarily fixed or can instead be updated from the context. Observers performed two tasks alternately. One task was to report the surface seen in front in a transparent motion stimulus. The other task was a visual search for a slow dot. Unknown to the observers, we systematically paired the target dot with one surface direction in an attempt to make that surface appear preferentially in front. This manipulation was sufficient to change the observer's preferred direction for the surface seen in front. Attentional explanations did not account for the results. Observers modified their idiosyncratic preference in motion transparency depth rivalry only because it was useful to perform well in an auxiliary task.
两组朝相反方向移动的点通常被视为两个透明表面。确定哪个表面在另一个表面的前面是双稳态的，观察者在看到前面的一个特定运动方向时表现出强烈的偏向。令人惊讶的是，这种偏向以一种持续、特异且不相关的方式依赖于刺激方向。我们在此研究了这个偏好方向是被任意固定的，还是可以根据上下文进行更新。观察者交替执行两项任务。一项任务是报告在透明运动刺激中看到的前面的表面。另一项任务是视觉搜索一个慢速移动的点。观察者不知道的是，我们系统地将目标点与一个表面方向配对，试图使该表面优先出现在前面。这种操作足以改变观察者对看到的前面表面的偏好方向。注意力方面的解释并不能说明这些结果。观察者仅因为在辅助任务中表现良好有用，就改变了他们在运动透明度深度竞争中的特异偏好。
