Abstract
The results of two experiments are reported. In the first it was found that the magnitude of the Pulfrich phenomenon is dependent upon the spatial frequency of the moving stimulus pattern: the greater the spatial frequency for a constant filter density and angular speed, the greater the apparent displacement in depth. In the second study, the magnitude of the Pulfrich effect was found to decrease with increasing angular width of moving single stripes up to an angular width of 27°. The data were interpreted as consistent with the view that for the Pulfrich effect the retinal disparity between the moving stimulus and the fixated stationary stimulus is not given by the retinal points actually stimulated at any instant in time, but rather by the registered rate of motion of the stimulus.
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