Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/20534
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dc.contributor.authorGheorghiu, Elena-
dc.contributor.authorKingdom, Frederick A A-
dc.contributor.authorSull, Manpreet-
dc.contributor.authorWells, Samantha-
dc.date.accessioned2014-06-25T23:21:20Z-
dc.date.issued2009-10-
dc.identifier.urihttp://hdl.handle.net/1893/20534-
dc.description.abstractWe have employed the shape frequency and shape-amplitude after-effects (SFAE and SAAE) to investigate: (i) whether the shapes of illusory and real curves are processed by the same or different mechanisms, and (ii) the carrier-tuning properties of illusory curvature mechanisms. The SFAE and SAAE are the phenomena in which adaptation to a sinusoidal-shaped contour results in a shift in, respectively, the perceived shape-frequency and perceived shape-amplitude of a test contour in a direction away from that of the adapting stimulus. Both after-effects are believed to be mediated by mechanisms sensitive to curvature (Gheorghiu and Kingdom, 2007a and Gheorghiu and Kingdom, 2009; see also Hancock & Peirce, 2008). We observed both shape after-effects in sinusoidally-shaped illusory contours defined by phase-shifted line-grating carriers. We tested whether illusory and real contours were mediated by the same or different mechanisms by comparing same adaptor-and-test with different adaptor-and-test combinations of real and illusory contours. Real contour adaptors produced after-effects in illusory contour tests that were as great as, or even greater than those produced by illusory contour adaptors. However, illusory contour adaptors produced much weaker after-effects in real contour tests than did real contour adaptors. This asymmetry suggests that illusory contour curves are encoded by a sub-set of mechanisms sensitive to real contour curves. We also examined the carrier-tuning properties of illusory-contour curvature processing using adaptor and test illusory contours that differed in the luminance contrast-polarity, luminance scale and orientation of the carriers. We found no selectivity to any of these dimensions for either even-symmetric or odd-symmetric line-gratings carriers, even though selectivity to these dimensions was found for real contours.en_UK
dc.language.isoen-
dc.publisherElsevier-
dc.relationGheorghiu E, Kingdom FAA, Sull M & Wells S (2009) Curvature coding in illusory contours, Vision Research, 49 (20), pp. 2518-2530.-
dc.rightsThe publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study.-
dc.subjectIllusory contoursen_UK
dc.subjectCurvatureen_UK
dc.subjectAdaptationen_UK
dc.subjectAfter-effecten_UK
dc.subjectPolarityen_UK
dc.subjectScaleen_UK
dc.subjectOrientationen_UK
dc.titleCurvature coding in illusory contoursen_UK
dc.typeJournal Articleen_UK
dc.rights.embargodate2999-12-31T00:00:00Z-
dc.rights.embargoreasonThe publisher does not allow this work to be made publicly available in this Repository therefore there is an embargo on the full text of the work.-
dc.identifier.doihttp://dx.doi.org/10.1016/j.visres.2009.08.009-
dc.citation.jtitleVision Research-
dc.citation.issn0042-6989-
dc.citation.volume49-
dc.citation.issue20-
dc.citation.spage2518-
dc.citation.epage2530-
dc.citation.publicationstatusPublished-
dc.citation.peerreviewedRefereed-
dc.type.statusPublisher version (final published refereed version)-
dc.author.emailelena.gheorghiu@stir.ac.uk-
dc.contributor.affiliationPsychology-
dc.contributor.affiliationMcGill University-
dc.contributor.affiliationMcGill University-
dc.contributor.affiliationMcGill University-
dc.rights.embargoterms2999-12-31-
dc.rights.embargoliftdate2999-12-31-
dc.identifier.isi000270861900009-
Appears in Collections:Psychology Journal Articles

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