We compare two versions of two known phenomena, the and the illusions, to highlight how similar manipulations lead to blindness to curvature and blindness to illusory curvature, respectively. The critical factor is a change in luminance polarity; this factor interferes with the computation of curvature along the contour, for both real and illusory curvature.
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http://dx.doi.org/10.1177/2041669518776986 | DOI Listing |
J Vis
December 2023
Department of Psychology, University of Münster, Münster, Germany.
Self-motion generates optic flow, a pattern of expanding visual motion. Heading estimation from optic flow analysis is accurate in rigid environments, but it becomes challenging when other human walkers introduce independent motion to the scene. Previous studies showed that heading perception is surprisingly accurate when moving through a crowd of walkers but revealed strong heading biases when either articulation or translation of biological motion were presented in isolation.
View Article and Find Full Text PDFAtten Percept Psychophys
January 2023
Experimental Psychology, Helmholtz Institute, Faculty of Social and Behavioral Sciences, Utrecht University, Room H0.25, Heidelberglaan 1, 3584CS, Utrecht, The Netherlands.
The eye's retinotopic exposure to an adapter typically produces an after-image. For example, an observer who fixates a red adapter on a gray background will see an illusory cyan after-image after removing the adapter. The after-image's content, like its color or intensity, gives insight into mechanisms responsible for adaptation and processing of a specific feature.
View Article and Find Full Text PDFVision Res
March 2022
School of Psychological Science, 35 Stirling Highway, University of Western Australia, Crawley, Perth, 6009 WA, Australia.
The perceived shapes of almost circular paths are modified by concentrically placed context paths. These induced changes have previously been attributed to curvature masking. This paper shows that, instead, they can be explained by the impacts of local tilt illusions.
View Article and Find Full Text PDFIperception
May 2018
Department of Psychology, Ritsumeikan University, Kyoto, Japan.
We compare two versions of two known phenomena, the and the illusions, to highlight how similar manipulations lead to blindness to curvature and blindness to illusory curvature, respectively. The critical factor is a change in luminance polarity; this factor interferes with the computation of curvature along the contour, for both real and illusory curvature.
View Article and Find Full Text PDFIperception
December 2017
Dartmouth College, Hanover, USA.
Building on the modal and amodal completion work of Kanizsa, Carman and Welch showed that binocular stereo viewing of two disparate images can give rise to a percept of 3D curved, nonclosed illusory contours and surfaces. Here, it is shown that binocular presentation can also give rise to the percept of closed curved surfaces or volumes that appear to vary smoothly across discrete depths in binocularly fused images, although in fact only two binocular disparities are discretely defined between corresponding contour elements of the inducing elements. Surfaces are filled in from one depth layer's visible contours to another layer's visible contours within virtual contours that are interpolated on the basis of good contour continuation between the visible portions of contour.
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