Spatial Vision , Vol. 18, No. 1, pp. 1 – 23 (2005) VSP 2005. Also available online - www.vsppub.com Symmetry cues for matching mirrored objects EMANUEL LEEUWENBERG ∗ and ROB VAN LIER Nijmegen Institute for Cognition and Information (NICI), University of Nijmegen, P. O. Box 9104, 6500 HE Nijmegen, The Netherlands Received 1 November 2003; accepted 21 May 2004 Abstract —The study explores cues for matching pairs of objects. These objects were arranged into mirror-symmetrical displays and the task was to judge whether a pre-specified 180 ◦ rotation around the X, Y or Z axis carries one object into the mirror object. For some rotations, the object’s mirror symmetry (M) and, for other rotations, the object’s point-symmetry (P) could serve as a cue. The matching results suggest that M is a better cue than P, say M > P. Various attempts are made to explain this effect. The most promising one focuses on simplest structural object representations as these capture M and not P. It is furthermore plausible that M captured by reference frames at high hierarchical representation levels, say M1, serves as a better cue than M captured at low levels, say M2. The prediction M1
Spatial Vision (continued as Seeing & Perceiving from 2010) – Brill
Published: Jan 1, 2005
Keywords: MENTAL ROTATION; REPRESENTATION CUES; HIERARCHICAL DOMINANCE; MIRROR- AND POINT-SYMMETRIES
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