Pseudoscopic viewing: transfer and persistence of reversed depth relations from the viewing of photographs to the real scene.

After viewing stereo pictures pseudoscopically (that is, with the pictures of the stereo-pair presented to the opposite eyes) part of the real scene depicted was perceived as inside out from the standpoint of depth during normal binocular vision. Experiments were designed to investigate this form of transfer but, since serious consequences can arise when an inside-out percept persists in normal binocular vision, it was intended that the experiments would be restricted to transfer of a less extreme kind. The scene chosen had not developed persistence during early trials but, surprisingly, one subject taking part in these experiments did experience some transfer from pseudoscopic direct viewing to normal binocular vision.