Creation of the horizontal-vertical illusion through imagery

Perception of the horizontal-vertical illusion was examined as a function of imaging ability. Subjects who scored either high or low on this attribute (as assessed by the Vividness of Visual Imagery Questionnaire, or VVIQ) were asked to image an inducing line or lines of the illusory stimulus. High imagers reported perceiving the illusion whether the inducing line(s) were imaged or were physically present. Also, the magnitude of the illusion as created by imagery-induced lines was equivalent to that produced for physically present lines. Low imagers reported perceiving the illusion only when inducing lines were physically present.

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