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Appears in Collections:Psychology Journal Articles
Peer Review Status: Refereed
Title: Temporal dynamics of mirror-symmetry perception
Author(s): Sharman, Rebecca J
Gregersen, Sebastian
Gheorghiu, Elena
Keywords: Symmetry
temporal delay
temporal integration
perceptual organisation
Issue Date: 31-May-2018
Date Deposited: 2-May-2018
Citation: Sharman RJ, Gregersen S & Gheorghiu E (2018) Temporal dynamics of mirror-symmetry perception. Journal of Vision, 18 (5), Art. No.: 10.;
Abstract: Recent studies have suggested that temporal dynamics rather than symmetrical motion-direction contribute to mirror-symmetry perception. Here we investigate temporal aspects of symmetry perception and implicitly, its temporal flexibility and limitations, by examining how symmetrical pattern elements are combined over time. Stimuli were dynamic dot-patterns consisting of either an on-going alternation of two images (sustained stimulus presentation) or just two images each presented once (transient stimulus presentation) containing different amounts of symmetry about the vertical axis. We varied the presentation duration of the two images under five temporal-arrangement conditions: (1)‘whole patterns’ in which a symmetric pattern alternated with a noise pattern; (2)‘delayed halves’ – the halves of the symmetric and noise patterns were presented with temporal delay; (3)‘matched-pairs’ – two alternating images each containing equal amounts of symmetrical matched-pairs; (4)‘delayed matched-pairs’ – the same as arrangement 3, but with matched-pairs presented with delay; (5)‘static’ – both images presented simultaneously as one. We found increased sensitivity in sustained compared to transient stimulus presentations and with synchronous compared to delayed matched-pairs stimuli. For the delayed conditions, sensitivity decreased gradually with longer image durations (>60ms), prominently for the transient stimulus presentations. We conclude that correlations across-the-symmetry-midline can be integrated over time (~120ms) and symmetry mechanisms can tolerate temporal delays between symmetric dot-pairs of up to ~60ms.
DOI Link: 10.1167/18.5.10
Rights: Copyright 2018 The Authors This work is licensed under a Creative Commons Attribution 4.0 International License (
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