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Influences of orientation on the Ponzo, contrast, and Craik-O’Brien-Cornsweet illusions
Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Psychology.
2019 (English)In: Attention, Perception & Psychophysics, ISSN 1943-3921, E-ISSN 1943-393XArticle in journal (Refereed) Published
Abstract [en]

Explanations of the Ponzo size illusion, the simultaneous contrast illusion, and the Craik-O’Brien-Cornsweet brightness illusions involve either stimulus-driven processes (assimilation, enhanced contrast, and anchoring) or prior experiences. Real-world up-down asymmetries for typical direction of illumination and ground planes in our physical environment should influence these illusions if they are experience based, but not if they are stimulus driven. Results presented here demonstrate differences in illusion strengths between upright and inverted versions of all three illusions. A left-right asymmetry of the Cornsweet illusion was produced by manipulating the direction of illumination, providing further support for the involvement of an experience-based explanation. When the inducers were incompatible with the targets being located at the different distances, the Ponzo illusion persisted and so did the influence from orientation, providing evidence for involvement of processes other than size constancy. As defined here, upright for the brightness illusions is consistent with an interpretation of a shaded bulging surface and a 3D object resulting from a light-from-above assumption triggering compensation for varying illumination. Upright for the Ponzo illusion is consistent with the inducers in the form of converging lines being interpreted as railway tracks receding on the ground triggering size constancy effects. The implications of these results, and other results providing evidence against experience-based accounts of the illusions, are discussed.

Place, publisher, year, edition, pages
2019.
National Category
Psychology
Identifiers
URN: urn:nbn:se:uu:diva-401764DOI: 10.3758/s13414-019-01953-8OAI: oai:DiVA.org:uu-401764DiVA, id: diva2:1383848
Available from: 2020-01-08 Created: 2020-01-08 Last updated: 2020-01-08

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Publisher's full texthttps://doi.org/10.3758/s13414-019-01953-8

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