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Inter-attribute tilt effects and orientation analysis in the visual brain
Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Psychology.
2000 (English)In: Vision Research, ISSN 0042-6989, E-ISSN 1878-5646, Vol. 40, no 20, 2711-2722 p.Article in journal (Refereed) Published
Abstract [en]

A test grating appears to be tilted away from an inducing grating for small angular separations (repulsion), but towards the inducing grating for larger angular separations (attraction). Previous research on luminance gratings suggests that repulsion is caused by local inhibition in cortical areas V1 and/or V2, and that the attraction involves global interactions beyond V1, in extrastriate areas. Experiments reported here demonstrate attribute invariant attraction and repulsion effects for gratings specified by luminance, motion, and disparity contrasts. A frame surrounding the inducing grating abolishes only the attraction effect, but a spatial frequency difference, or a small gap between the inducer and test gratings, abolishes only the repulsion effect, irrespective of the attributes that specify the gratings. It is proposed that detectors selectively sensitive to attribute invariant orientation and size exist in early cortical sites such as V1 and/or V2.

Place, publisher, year, edition, pages
Elsevier, 2000. Vol. 40, no 20, 2711-2722 p.
Keyword [en]
contour, cue invariance, tilt illusion, orientation
National Category
URN: urn:nbn:se:uu:diva-90143DOI: 10.1016/S0042-6989(00)00132-2OAI: oai:DiVA.org:uu-90143DiVA: diva2:162379
Available from: 2003-02-20 Created: 2003-02-20 Last updated: 2012-11-20Bibliographically approved
In thesis
1. Binding Three Kinds of Vision
Open this publication in new window or tab >>Binding Three Kinds of Vision
2003 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Pictorial cues, together with motion and stereoscopic depth fields, can be used for perception and constitute ‘three kinds’ of vision. Edges in images are important features and can be created in either of these attributes. Are local edge and global shape detection processes attribute-specific? Three visual phenomena, believed to be due to low-level visual processes, were used as probes to address these issues. (1) Tilt illusions (misperceived orientation of a bar caused by an inducing grating) were used to investigate possible binding of edges across attributes. Double dissociation of tilt repulsion illusions (obtained with small orientation differences between inducer and bar) and attraction illusions (obtained with large orientation differences) suggest different mechanisms for their origins. Repulsion effects are believed to be due to processes in striate cortex and attraction because of higher level processing. The double dissociation was reproduced irrespective of the attributes used to create the inducing grating and the test-bar, suggesting that the detection and binding of edges across attributes take place in striate cortex. (2) Luminance-based illusory contour perception is another phenomenon believed to be mediated by processes in early visual cortical areas. Illusory contours can be cued by other attributes as well. Detection facilitation of a near-threshold luminous line occurred when it was superimposed on illusory contours irrespective of the attributes used as inducers. The result suggests attribute-independent activation of edge detectors, responding to real as well as illusory contours. (3) The performance in detecting snake-like shapes composed of aligned oriented elements embedded in randomly oriented noise elements was similar irrespective of the attributes used to create the elements. Performance when the attributes alternated along the path was superior to that predicted with an independent channel model. These results are discussed in terms of binding across attributes by feed-forward activation of orientation selective attribute-invariant cells (conjunction cells) in early stages of processing and contextual modulation and binding across visual space mediated by lateral and/or feedback signals from higher areas (dynamic binding).

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2003. 60 p.
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Social Sciences, ISSN 0282-7492 ; 121
Psychology, Attribute-invariance, binding, contours, edge linking, gestalt-laws, illusory contour, lateral interactions, neuronal mechanisms, tilt effect, vision, Psykologi
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Research subject
urn:nbn:se:uu:diva-3319 (URN)91-554-5518-2 (ISBN)
Public defence
2003-03-18, 1022, Jacobsson Widdingsalen, Uppsala, 13:15
Available from: 2003-02-20 Created: 2003-02-20Bibliographically approved

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