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DC Field | Value | Language |
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dc.contributor.author | Jennings, B | - |
dc.contributor.author | Tseng, T-W | - |
dc.contributor.author | Ouhnana, M | - |
dc.contributor.author | Kingdom, F | - |
dc.date.accessioned | 2022-10-21T19:47:01Z | - |
dc.date.available | 2022-10-21T19:47:01Z | - |
dc.date.issued | 2022-11-30 | - |
dc.identifier.citation | Jennings, B.J., et al. (2022) 'Different symmetries, different mechanisms', Attention, Perception and Psychophysics, 85, pp. 166 - 173. doi: 10.3758/s13414-022-02599-9. | en_US |
dc.identifier.issn | 1943-3921 | - |
dc.identifier.uri | https://bura.brunel.ac.uk/handle/2438/25352 | - |
dc.description.abstract | Three common symmetries exist in the natural visual world: (i) mirror symmetry, i.e., reflections around a vertical axis, (ii) radial symmetry, i.e., rotations around a point, and (iii) translational symmetry, i.e., shifted repetitions. Are these processed by a common class of visual mechanism? Using stimuli comprising arrays of Gaussian blobs we examined this question using a visual search protocol in which observers located a single symmetric target patch among varying numbers of random-blob distractor patches. The testing protocol used a blocked present/absent task and both search times and accuracy were recorded. Search times for mirror and radial symmetry increased significantly with the number of distractors, as did translational-symmetry patterns containing few repetitions. However translational-symmetry patterns with four repeating sectors produced search slopes close to zero. Fourier analysis revealed that, as with images of natural scenes, the structural information in both mirror- and radial-symmetric patterns is carried by the phase spectrum. However, for translational patterns with four repeating sectors, the amplitude spectrum appears to capture the structure, consistent with previous analyses of texture regularity. Modeling revealed that while the mirror and radial patterns produced an approximately Gaussian-shaped energy response profile as a function of spatial frequency, the translational pattern profiles contained a distinctive spike, the magnitude of which increased with the number of repeating sectors. We propose distinct mechanisms for the detection of different symmetry types: a mechanism that encodes local positional information to detect mirror- and radial-symmetric patterns and a mechanism that computes energy in narrowband filters for the detection of translational symmetry containing many sectors. | - |
dc.description.sponsorship | Canadian Institute if Health Research grant ~MOP 123349. | en_US |
dc.format.extent | 166 - 173 | - |
dc.format.medium | Print-Electronic | - |
dc.language.iso | en_US | en_US |
dc.publisher | Spriner Nature on behalf of the Psychonomic Society | en_US |
dc.rights | Copyright © The Author(s) 2022 Rights and permissions: Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit https://creativecommons.org/licenses/by/4.0/. | - |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | - |
dc.subject | symmetry | en_US |
dc.subject | mirror | en_US |
dc.subject | radial | en_US |
dc.subject | translational | en_US |
dc.subject | spatial vision | en_US |
dc.subject | visual search | en_US |
dc.title | Different symmetries, different mechanisms | en_US |
dc.type | Article | en_US |
dc.identifier.doi | https://doi.org/10.3758/s13414-022-02599-9 | - |
dc.relation.isPartOf | Attention, Perception and Psychophysics | - |
pubs.publication-status | Published | - |
pubs.volume | 85 | - |
dc.identifier.eissn | 1943-393X | - |
Appears in Collections: | Dept of Life Sciences Research Papers |
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