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Global shape processing involves a hierarchy of integration stages

Bell, Jason; Gheorghiu, E; Hess, R.F.; Kingdom, Frederick A A

Description

Radial Frequency (RF) patterns can be used to study the processing of familiar shapes, e.g. triangles and squares. Opinion is divided over whether the mechanisms that detect these shapes integrate local orientation and position information directly, or whether local orientations and positions are first combined to represent extended features, such as curves, and that it is local curvatures that the shape mechanism integrates. The latter view incorporates an intermediate processing stage, the...[Show more]

dc.contributor.authorBell, Jason
dc.contributor.authorGheorghiu, E
dc.contributor.authorHess, R.F.
dc.contributor.authorKingdom, Frederick A A
dc.date.accessioned2015-12-10T21:56:09Z
dc.identifier.issn0042-6989
dc.identifier.urihttp://hdl.handle.net/1885/39294
dc.description.abstractRadial Frequency (RF) patterns can be used to study the processing of familiar shapes, e.g. triangles and squares. Opinion is divided over whether the mechanisms that detect these shapes integrate local orientation and position information directly, or whether local orientations and positions are first combined to represent extended features, such as curves, and that it is local curvatures that the shape mechanism integrates. The latter view incorporates an intermediate processing stage, the former does not. To differentiate between these hypotheses we studied the processing of micro-patch sampled RF patterns as a function of the luminance polarity of successive elements on the contour path. Our first study measures shape after effects involving suprathreshold amplitude RF shapes and shows that alternating the luminance polarity of successive micro-patch elements disrupts adaptation of the global shape. Our second study shows that polarity alternations also disrupt sensitivity to threshold-amplitude RF patterns. These results suggest that neighbouring points of the contour shape are integrated into extended features by a polarity selective mechanism, prior to global shape processing, consistent with the view that for both threshold amplitude and suprathreshold amplitude patterns, global processing of RF shapes involves an intermediate stage of processing.
dc.publisherPergamon-Elsevier Ltd
dc.sourceVision Research
dc.subjectKeywords: article; eye fixation; human; human experiment; image processing; luminance; normal human; priority journal; signal processing; task performance; visual acuity; visual adaptation; visual memory; visual orientation; visual stimulation; visual system; Adapt Adaptation; Contour; Curvature; Orientation; Shape
dc.titleGlobal shape processing involves a hierarchy of integration stages
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume51
dc.date.issued2011
local.identifier.absfor170112 - Sensory Processes, Perception and Performance
local.identifier.ariespublicationu9312950xPUB174
local.type.statusPublished Version
local.contributor.affiliationBell, Jason, College of Medicine, Biology and Environment, ANU
local.contributor.affiliationGheorghiu, E, University of Leuven
local.contributor.affiliationHess, R.F., McGill Univeirsity
local.contributor.affiliationKingdom, Frederick A A, McGill University
local.description.embargo2037-12-31
local.bibliographicCitation.startpage1760
local.bibliographicCitation.lastpage1766
local.identifier.doi10.1016/j.visres.2011.06.003
dc.date.updated2016-02-24T11:58:25Z
local.identifier.scopusID2-s2.0-79960842860
local.identifier.thomsonID000294312500005
CollectionsANU Research Publications

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