PMID: 15250666Jul 15, 2004Paper

Is there an assignment of top and bottom during symmetry perception?

Perception
Johan Hulleman, Glyn W Humphreys

Abstract

We report data from a discrimination task in which participants had to decide whether a single-item display was either vertically symmetric or asymmetric. This decision was found to be easier when items with a top bottom polarity were placed in an orientation where the wide end was the base of the stimulus and the narrow end was the top. The difference in reaction times between this orientation and its inversion was about 10 ms. We suggest that top and bottom labels are assigned to stimuli during the detection of bilateral symmetry.

References

Jul 1, 1985·Memory & Cognition·P Jolicoeur
Dec 1, 1981·Journal of Experimental Psychology. Human Perception and Performance·F L Royer
Jan 1, 1995·Spatial Vision·J Wagemans
Jan 1, 1994·Spatial Vision·S C Dakin, R J Watt
Nov 20, 1998·Perception & Psychophysics·C N Olivers, P A van der Helm
Mar 18, 2000·Canadian Journal of Experimental Psychology = Revue Canadienne De Psychologie Expérimentale·A B Sekuler, M B Swimmer

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Citations

Jan 31, 2008·Psychonomic Bulletin & Review·Johan Hulleman, Christian N L Olivers
Dec 4, 2012·Vision Research·Frédéric Devinck, Lothar Spillmann
Sep 3, 2004·Vision Research·Johan Hulleman, Glyn W Humphreys

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