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The effects of mirror reflections and planar rotations of pictures on the shape percept of the depicted object.
Perception. 2009; 38(10):1439-66.P

Abstract

Mirror reflections and planar rotations of a picture do not result in any variations concerning the internal geometrical layout of the objects depicted in the picture. We examined to what extent these picture plane transformations gave rise to perceptual differences. A large set of pictures was generated by mirror-reflecting and rotating a set of six original photographs in the picture plane. We externalised the percepts of the depicted objects by using a direct perceptual method: the gauge-figure method. Participants had to adjust a gauge figure so that it seemed to be painted on the surface of the depicted object. From an extensive set of settings collected this way, we computed for each picture the three-dimensional interpretation--or pictorial relief--of the depicted object. On the basis of this set of pictorial reliefs, we addressed the effects of mirror reflections and rotations of pictures on the shape percept of the depicted object. Mirror-reflecting a picture around the horizontal axis resulted in large differences in pictorial reliefs, whereas mirror-reflecting pictures around the vertical axis resulted in only small differences in pictorial reliefs. Clockwise 90 degrees, 180 degrees, and 270 degrees rotation affected the pictorial relief significantly. In all cases, the differences between the pictorial reliefs could be resolved by affine transformations, and could thus be ascribed to different solutions of the depth ambiguities inherent in pictures.

Authors+Show Affiliations

Industrial Design, Delft University of Technology, Landbergstraat 15, 2628 CC Delft, The Netherlands. els.cornelis@psy.kuleuven.beNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

19950478

Citation

Cornelis, Els V K., et al. "The Effects of Mirror Reflections and Planar Rotations of Pictures On the Shape Percept of the Depicted Object." Perception, vol. 38, no. 10, 2009, pp. 1439-66.
Cornelis EV, van Doorn AJ, Wagemans J. The effects of mirror reflections and planar rotations of pictures on the shape percept of the depicted object. Perception. 2009;38(10):1439-66.
Cornelis, E. V., van Doorn, A. J., & Wagemans, J. (2009). The effects of mirror reflections and planar rotations of pictures on the shape percept of the depicted object. Perception, 38(10), 1439-66.
Cornelis EV, van Doorn AJ, Wagemans J. The Effects of Mirror Reflections and Planar Rotations of Pictures On the Shape Percept of the Depicted Object. Perception. 2009;38(10):1439-66. PubMed PMID: 19950478.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The effects of mirror reflections and planar rotations of pictures on the shape percept of the depicted object. AU - Cornelis,Els V K, AU - van Doorn,Andrea J, AU - Wagemans,Johan, PY - 2009/12/3/entrez PY - 2009/12/3/pubmed PY - 2010/5/14/medline SP - 1439 EP - 66 JF - Perception JO - Perception VL - 38 IS - 10 N2 - Mirror reflections and planar rotations of a picture do not result in any variations concerning the internal geometrical layout of the objects depicted in the picture. We examined to what extent these picture plane transformations gave rise to perceptual differences. A large set of pictures was generated by mirror-reflecting and rotating a set of six original photographs in the picture plane. We externalised the percepts of the depicted objects by using a direct perceptual method: the gauge-figure method. Participants had to adjust a gauge figure so that it seemed to be painted on the surface of the depicted object. From an extensive set of settings collected this way, we computed for each picture the three-dimensional interpretation--or pictorial relief--of the depicted object. On the basis of this set of pictorial reliefs, we addressed the effects of mirror reflections and rotations of pictures on the shape percept of the depicted object. Mirror-reflecting a picture around the horizontal axis resulted in large differences in pictorial reliefs, whereas mirror-reflecting pictures around the vertical axis resulted in only small differences in pictorial reliefs. Clockwise 90 degrees, 180 degrees, and 270 degrees rotation affected the pictorial relief significantly. In all cases, the differences between the pictorial reliefs could be resolved by affine transformations, and could thus be ascribed to different solutions of the depth ambiguities inherent in pictures. SN - 0301-0066 UR - https://www.unboundmedicine.com/medline/citation/19950478/The_effects_of_mirror_reflections_and_planar_rotations_of_pictures_on_the_shape_percept_of_the_depicted_object_ L2 - http://journals.sagepub.com/doi/full/10.1068/p6101?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -