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dc.contributor.authorGillespie, Christopher
dc.contributor.authorVishwanath, Dhanraj
dc.identifier.citationGillespie , C & Vishwanath , D 2019 , ' A shape-level flanker facilitation effect in contour integration and the role of shape complexity ' , Vision Research , vol. 158 , pp. 221-236 .
dc.identifier.otherORCID: /0000-0002-8095-0537/work/64697704
dc.descriptionThis work by funded by an EPSRC doctoral training grant at the University of St Andrews.en
dc.description.abstractThe detection of an object in the visual field requires the visual system to integrate a variety of local features into a single object. How these local processes and their global integration is influenced by the presence of other shapes in the visual field is poorly understood. The detectability (contour integration) of a central target object in the form of a two dimensional Gaborized contour was compared in the presence or absence of nearby surrounding objects. A 2-AFC staircase procedure added orientation jitter to the constituent Gabor patches to determine the detectability of the target contour. The set of contours was generated using shape profiles of everyday objects and geometric forms. Experiment 1 examined the effect of three types of congruencies between the target and two flanking contours (contour shape, symmetry and familiarity). Experiment 2 investigated the effect of varying the number and spatial positions of the flankers. In addition, a measure of shape complexity (reciprocal of shape compactness) was used to assess the effects of contour complexity on detection. Across both experiments the detectability of the target contour increased when the target and flanker had the same shape and this was related to both the number of flankers and the complexity of the target shapes. Another factor that modulated this shape-level flanker facilitation effect was the presence of symmetry. The overall results are consistent with a contour integration process in which the visual system incorporates contextual information to extract the most likely smooth contour within a noise field.
dc.relation.ispartofVision Researchen
dc.subjectContour integrationen
dc.subjectObject detectionen
dc.subjectPerceptual groupingen
dc.subjectFigure-ground organizationen
dc.subjectBF Psychologyen
dc.titleA shape-level flanker facilitation effect in contour integration and the role of shape complexityen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. School of Psychology and Neuroscienceen
dc.contributor.institutionUniversity of St Andrews. Institute of Behavioural and Neural Sciencesen
dc.description.statusPeer revieweden

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