MOTION PARALLAX, RELATIVE SIZE, AND BENUSSI EFFECT

Many observers perceive depth when a configuration of nonconcentric ci rcles is rotated on a disc. While it has been suggested by a number of investigators that motion parallax has a role in generating this phen omenon, the supporting data are equivocal. The current study proposed that the ambiguity regarding the role of motion parallax may have aris en because there are contradictions between relative size cues and mot ion parallax cues in the configuration of rotating circles. However, w ith 17 undergraduate observers, apparent depth was no more reliably re ported with consistent cues of motion parallax and relative size than when these cues were contradictory.