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dc.contributor.authorDickinson, J.E.
dc.contributor.authorCribb, S.J.
dc.contributor.authorRiddell, Hugh
dc.contributor.authorBadcock, D.R.
dc.date.accessioned2020-09-07T03:04:07Z
dc.date.available2020-09-07T03:04:07Z
dc.date.issued2015
dc.identifier.citationDickinson, J.E. and Cribb, S.J. and Riddell, H. and Badcock, D.R. 2015. Tolerance for local and global differences in the integration of shape information. Journal of Vision. 15 (3). Article No. 21.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/80930
dc.identifier.doi10.1167/15.3.21
dc.description.abstract

© 2015 ARVO. Shape is a critical cue to object identity. In psychophysical studies, radial frequency (RF) patterns, paths deformed from circular by a sinusoidal modulation of radius, have proved valuable stimuli for the demonstration of global integration of local shape information. Models of the mechanism of integration have focused on the periodicity in measures of curvature on the pattern, despite the fact that other properties covary. We show that patterns defined by rectified sinusoidal modulation also exhibit global integration and are indistinguishable from conventional RF patterns at their thresholds for detection, demonstrating some indifference to the modulating function. Further, irregular patterns incorporating four different frequencies of modulation are globally integrated, indicating that uniform periodicity is not critical. Irregular patterns can be handed in the sense that mirror images cannot be superimposed. We show that mirror images of the same irregular pattern could not be discriminated near their thresholds for detection. The same irregular pattern and a pattern with four cycles of a constant frequency of modulation completing 2p radians were, however, perfectly discriminated, demonstrating the existence of discrete representations of these patterns by which they are discriminated. It has previously been shown that RF patterns of different frequencies are perfectly discriminated but that patterns with the same frequency but different numbers of cycles of modulation were not. We conclude that such patterns are identified, near threshold, by the set of angles subtended at the center of the pattern by adjacent points of maximum convex curvature.

dc.languageeng
dc.relation.sponsoredbyhttp://purl.org/au-research/grants/arc/DP1097003
dc.relation.sponsoredbyhttp://purl.org/au-research/grants/arc/DP110104553
dc.relation.sponsoredbyhttp://purl.org/au-research/grants/arc/DP130102580
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectdetection
dc.subjectdiscrimination
dc.subjectform
dc.subjectglobal integration
dc.subjectradial frequency patterns
dc.subjectshape
dc.subjectthreshold
dc.subjectAdult
dc.subjectForm Perception
dc.subjectHumans
dc.subjectPattern Recognition, Visual
dc.subjectPhotic Stimulation
dc.subjectPsychophysics
dc.subjectSensation
dc.subjectSensory Thresholds
dc.titleTolerance for local and global differences in the integration of shape information
dc.typeJournal Article
dcterms.source.volume15
dcterms.source.number3
dcterms.source.issn1534-7362
dcterms.source.titleJournal of Vision
dc.date.updated2020-09-07T03:04:07Z
curtin.departmentSchool of Psychology
curtin.accessStatusOpen access
curtin.facultyFaculty of Health Sciences
curtin.contributor.orcidRiddell, Hugh [0000-0001-8218-7822]
dcterms.source.eissn1534-7362
curtin.contributor.scopusauthoridRiddell, Hugh [56741049600]


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