Binocular Disparity, Stimulus Intensity and the Way of Light Presentation

Correspondence, disparity and displacement are the bases on which any hypothesis of depth perception must stand. Werner (1937) brought forward that depth perception which is the result of displacement of visual direction of disparity, depends on the process which leads to displacement. Displacement as the result of unification of retinal points is the only indispensable perceptual condition for binocular depth. And here, too, displacement must be understood as a dynamic, not a static, concept. It must be interpreted as the process of changes in the spatial values of retinal points depending on the process of change in the width-value of the retinal point. In figure I, an observer can look at two threads one of which F is in focus, and the other of which A appears as an uncrossed double image. The former on both retinas is f1, f2 and the latter is a1 and a2.