Relative cues and absolute distance perception.

I I t is possible, in theory, for the simultaneous occurrence of several different relative cues i of distances to increase the veridicality of the perception of absolute distance. To test whether I this actually occurs, a three-dimensional display was viewed monocularly while moving the head laterally, under conditions in which some error in perceived absolute distance was expected. The perceived absolute distance of the display was measured with the number of relative cues of distance within the display varied. No systematic reduction was found in the error in perceived absolute distance as a consequence of the variation in the number of relative cues. The study provides no evidence that the potential source of absolute distance information provided by relative cues is utilized by the visual system.