1973 volume 2(2) pages 225 – 234
doi:10.1068/p020225

Cite as:
Georgeson M A, Blakemore C, 1973, "Apparent depth and the Müller-Lyer illusion" Perception 2(2) 225 – 234
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Apparent depth and the Müller-Lyer illusion

M A Georgeson, C Blakemore

Received 12 April 1973

Abstract. The Müller-Lyer illusion was presented stereoscopically as either a flat or a three-dimensional figure. When the flat figure was made to appear closer or further than a comparison line, the illusion persisted along with large changes in overall size due to classical size constancy. When the fins of the figure were tilted in depth the illusion was somewhat reduced for both forward and backward tilts. It is argued that the size-constancy theory of illusions should predict an enhancement when stereopsis and 'the typical perspective view' reinforce each other, and abolition or reversal of the illusion when they are in opposition. These results therefore pose some problems for the theory.

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