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Symmetry
Special Issues
Visual Processing of Symmetry
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Visual Processing of Symmetry

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Computer".

Deadline for manuscript submissions: closed (28 February 2023) | Viewed by 3206

Special Issue Editors

Prof. Dr. Marco Bertamini

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Guest Editor
Department of Psychological Sciences, University of Liverpool, Liverpool L69 7ZA, UK
Interests: visual perception; symmetry; attention; multisensory integration; mirrors
Special Issues, Collections and Topics in MDPI journals
Dr. Alexis Makin

E-Mail Website
Guest Editor
Department of Psychological Sciences, University of Liverpool, Liverpool L69 7ZA, UK
Interests: empirical aesthetics; symmetry perception; velocity perception; smooth pursuit eye movements; prediction-motion tasks
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Peter Jes Kohler

E-Mail Website
Guest Editor
Department of Psychology, Faculty of Health, York University, Toronto, ON M3J 1P3, Canada
Interests: visual neuroscience; visual processing

Special Issue Information

Dear Colleagues,

We are pleased to announce a new Special Issue in the journal Symmetry, associated with the 7th annual Visual Properties Driving Visual Preference (VPDVP) workshop (https://www.bertamini.org/lab/vpdvp.html) at the University of Liverpool. We welcome articles that report new insights into the neural processing of visual symmetry, obtained with either brain imaging or behavioural methods.

Prof. Dr. Marco Bertamini
Dr. Alexis Makin
Prof. Dr. Peter Jes Kohler
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Symmetry is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • symmetry
  • fractal dimension
  • natural statistics
  • smooth curvature

Published Papers (2 papers)

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Research

9 pages, 2391 KiB  
Article
Overlapping Neural Responses to Reflectional Symmetry and Glass Patterns Revealed by an ERP Priming Paradigm
by John Tyson-Carr, Giulia Rampone, Elena Karakashevska, Yiovanna Derpsch, Marco Bertamini and Alexis D. J. Makin
Symmetry 2022, 14(7), 1329; https://doi.org/10.3390/sym14071329 - 27 Jun 2022
Cited by 1 | Viewed by 1391
Abstract
The extrastriate visual cortex is activated by visual regularity and generates an ERP known as the sustained posterior negativity (SPN). Spatial filter models offer a biologically plausible account of regularity detection based on the spectral properties of an image. These models are specific [...] Read more.
The extrastriate visual cortex is activated by visual regularity and generates an ERP known as the sustained posterior negativity (SPN). Spatial filter models offer a biologically plausible account of regularity detection based on the spectral properties of an image. These models are specific to reflection and therefore imply that reflectional symmetry and Glass patterns are coded by different neural populations. We utilised the SPN priming effect to probe representational overlap between reflection and Glass patterns. For each trial, participants were presented with a rapid succession of three patterns. In the Repeated condition, three reflections or three Glass patterns were presented. In the Changing condition, patterns alternated between reflection and Glass patterns. An increase in SPN amplitude (priming) was observed in both the Repeated and Changing conditions. Results indicate a greater representational overlap in the brain between reflection and Glass patterns than predicted by spatial filter models. Full article
(This article belongs to the Special Issue Visual Processing of Symmetry)
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12 pages, 7161 KiB  
Article
Perceptual Similarities among Wallpaper Group Exemplars
by Peter J. Kohler, Shivam Vedak and Rick O. Gilmore
Symmetry 2022, 14(5), 857; https://doi.org/10.3390/sym14050857 - 21 Apr 2022
Viewed by 1563
Abstract
Symmetries are abundant within the visual environment, and many animals species are sensitive to visual symmetries. Wallpaper groups constitute a class of 17 regular textures that each contain a distinct combination of the four fundamental symmetries, translation, reflection, rotation and glide reflection, and [...] Read more.
Symmetries are abundant within the visual environment, and many animals species are sensitive to visual symmetries. Wallpaper groups constitute a class of 17 regular textures that each contain a distinct combination of the four fundamental symmetries, translation, reflection, rotation and glide reflection, and together represent the complete set of possible symmetries in two-dimensional images. Wallpapers are visually compelling and elicit responses in visual brain areas that precisely capture the symmetry content of each group in humans and other primates. Here we ask to what extent different exemplars from the same wallpaper group are perceptually similar. We used an algorithm to produce a set of well-matched exemplars from 5 of the 17 wallpaper groups and instructed participants to freely sort the exemplars from each group into as many subsets as they wished based on any criteria they saw appropriate. P1, the simplest of the 17 groups, was consistently rated more self-similar than any other group, while the other four groups, although varying in symmetry content, were comparable in self-similarity. Our results suggest that except for the most extreme case (P1), perceived self-similarity of wallpaper groups is not directly tied to categories of symmetry based on group theory. Full article
(This article belongs to the Special Issue Visual Processing of Symmetry)
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