Distance Perception in Darkness

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Science  17 Jul 1964:
Vol. 145, Issue 3629, pp. 294-295
DOI: 10.1126/science.145.3629.294


Human subjects viewed round stimuli located equidistantly in the horizontal and vertical planes of vision under conditions where presumed cues to size were present and where they were systematically eliminated. Two experiments revealed a consistent tendency for the horizon object to be judged the closer. Cues introduced reduced the effect.