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Symmetry 2017, 9(5), 76;

Asymmetry for Symmetry: Right-Hemispheric Superiority in Bi-Dimensional Symmetry Perception

Department of Psychology, Health and Territory, G. d’Annunzio University of Chieti-Pescara, Chieti 66013, Italy
Department of Clinical and Experimental Medicine, Neuroscience and Cell Biology Section, Polytechnic University of Marche, Ancona 60121, Italy
Regional Epilepsy Centre, Neurological Clinic, Ospedali Riuniti, Ancona 60126, Italy
Author to whom correspondence should be addressed.
Academic Editor: Lesley Rogers
Received: 2 April 2017 / Revised: 15 May 2017 / Accepted: 16 May 2017 / Published: 18 May 2017
(This article belongs to the Special Issue Brain Asymmetry of Structure and/or Function)
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A right-hemispheric superiority has been shown for spatial symmetry perception with mono-dimensional stimuli (e.g., bisected lines). Nevertheless, the cerebral imbalance for bi-dimensional stimuli is still controversial, and the aim of the present study is to investigate this issue. Healthy participants and a split-brain patient (D.D.C.) were tested in a divided visual field paradigm, in which a square shape was presented either in the left or right visual field and they were asked to judge whether a dot was placed exactly in the center of the square or off-center, by using the left/right hand in two separate sessions. The performance of healthy participants was better when the stimuli presented in the left visual field (LVF) were on-center rather than off-center. The performance of D.D.C. was higher than chance only when on-center stimuli were presented in the LVF in the left hand session. Only in this condition did his accuracy not differ with respect to that of the control group, whereas in all of the other conditions, it was lower than the controls’ accuracy. We conclude that the right-hemispheric advantage already shown for mono-dimensional stimuli can be extended also to bi-dimensional configurations, confirming the right-hemispheric superiority for spatial symmetry perception. View Full-Text
Keywords: perceptual symmetry; cerebral hemispheres; split-brain patient; spatial processing; bi-dimensional stimuli perceptual symmetry; cerebral hemispheres; split-brain patient; spatial processing; bi-dimensional stimuli

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Prete, G.; Fabri, M.; Foschi, N.; Tommasi, L. Asymmetry for Symmetry: Right-Hemispheric Superiority in Bi-Dimensional Symmetry Perception. Symmetry 2017, 9, 76.

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