Relative size as a cue to the relative distances of random stereogram images

Document Type


Department or Administrative Unit


Publication Date



With random letter stereograms as stimuli, three groups of Ss made judgments of relative size and relative distance of paired stereo images varying in size but not in distance, as indexed by amount of retinal disparity. Ss in Group D were instructed that members of the stereo pairs differed in size and distance; Ss in Group S were told that there were distance differences but not size differences; Ss in Group N were told nothing about either relative sizes or relative distances. Differences in instructions regarding relative size did not affect relative size judgments: Ss typically reported the objectively larger image as being larger. Ss in all three groups reliably reported the objectively smaller image as being the more distant image.


This article was originally published in Psychonomic Science. The full-text article from the publisher can be found here.

Due to copyright restrictions, this article is not available for free download from ScholarWorks @ CWU.


Psychonomic Science