A unified account of tilt illusions, association fields, and contour detection based on Elastica

Keemink, Sander W. and van Rossum, Mark C.W. (2016) A unified account of tilt illusions, association fields, and contour detection based on Elastica. Vision Research, 126 . pp. 164-173. ISSN 1878-5646

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Abstract

As expressed in the Gestalt law of good continuation, human perception tends to associate stimuli that form smooth continuations. Contextual modulation in primary visual cortex, in the form of association fields, is believed to play an important role in this process. Yet a unified and principled account of the good continuation law on the neural level is lacking. In this study we introduce a population model of primary visual cortex. Its contextual interactions depend on the elastica curvature energy of the smoothest contour connecting oriented bars. As expected, this model leads to association fields consistent with data. However, in addition the model displays tilt-illusions for stimulus configurations with grating and single bars that closely match psychophysics. Furthermore, the model explains not only pop-out of contours amid a variety of backgrounds, but also pop-out of single targets amid a uniform background. We thus propose that elastica is a unifying principle of the visual cortical network.

Item Type: Article
Keywords: Association fields; Tilt illusion; Contextual interactions; Smoothness; Elastica; Gestalt
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Psychology
Identification Number: https://doi.org/10.1016/j.visres.2015.05.021
Depositing User: Van Rossum, Mark
Date Deposited: 07 Feb 2018 09:57
Last Modified: 08 Feb 2018 10:14
URI: http://eprints.nottingham.ac.uk/id/eprint/49596

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