Hans Wallach

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The problem of how three-dimensional form is perceived in spite of the fact that pertinent stimulation consists only in two-dimensional retinal images has been only partly solved. Much is known about the impressive effectiveness of binocular disparity. However, the excellent perception of threedimensional form in monocular vision has remained essentially(More)
In a previous paper the writer has demonstrated that a distinct localization of sound exists for directions which do not fall into the horizontal plane but lie above or below at varying elevations, in other words that a discrimination of directions with respect to above and below and front and back is possible as well as discrimination with respect to right(More)
When the eyes track a moving object, the image of a stationary target shifts on the retina colinearly with the eye movement. A compensation process called position constancy prevents this image shift from causing perceived target motion commensurate with the image shift. The target either appears stationary or seems to move in the direction opposite to the(More)