Morgan M J, Thompson P
Perception. 1975;4(1):3-18. doi: 10.1068/p040003.
The Pulfrich pendulum effect, obtained by viewing a moving object with a filter over one eye, was examined with target stimuli in apparent, rather than continuous, motion. The filter-induced depth effect persisted until a certain degree of intermittency in the presentations of the target was reached, and then it broke down. The degree of intermittency that could be tolerated before the depth effect broke down increased with the density of the filter. It could be argued that the filter determined a shift in the pairing of successive inputs to the eyes, such that the target position in the unfiltered eye was fused with the preceding target position in the filtered eye. However, it appears that the shifted-pairing effect cannot account for the depth impression seen when the target intermittency is less than about 30 ms. Below this value of intermittency a filter can produce a depth effect even when the delay it introduces is small in comparison to the intermittency of the input. The depth effect seen with intermittencies less than 30 ms appears to be of the same magnitude as that obtained with stimuli in continuous motion. It is concluded that a filter can cause two different kinds of depth shift with apparently moving stimuli.
通过用滤光片遮住一只眼睛观察运动物体所获得的普尔弗里希摆效应，在目标刺激以明显而非连续运动的情况下进行了研究。滤光片引起的深度效应一直持续到目标呈现达到一定程度的间歇性，然后才消失。在深度效应消失之前能够耐受的间歇性程度随着滤光片的密度增加而增加。可以认为滤光片决定了向双眼连续输入的配对发生偏移，使得未被滤光的眼睛中的目标位置与被滤光的眼睛中先前的目标位置相融合。然而，当目标间歇性小于约30毫秒时，似乎这种偏移配对效应无法解释所看到的深度印象。低于这个间歇性值时，即使滤光片引入的延迟与输入的间歇性相比很小，它也能产生深度效应。间歇性小于30毫秒时所看到的深度效应似乎与连续运动刺激所获得的深度效应大小相同。得出的结论是，滤光片可以对明显运动的刺激产生两种不同类型的深度偏移。
