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  • Title: The role of figure orientation and apparent depth in the perception of the horizontal-vertical illusion.
    Author: Schiffman HR, Thompson JG.
    Journal: Perception; 1975; 4(1):79-83. PubMed ID: 1161442.
    Abstract:
    An experiment was performed which examined the role of figural orientation directly, and the role of an inappropriately invoked size-constancy mechanism indirectly, in the actuation and magnitude of the horizontal-vertical illusion. When the vertical line of the stimulus figure was aligned above the horizontal line, the illusory effect was significant and positive; in contrast, when the vertical line was located below the horizontal line, the illusion was negative. Under the assumption that a vertical line can appear as a foreshortened line in depth, these findings support an explanation based on the operation of a misapplied size-constancy mechanism.
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