Perceiving illusory contours: Figure detection and shape discrimination
نویسندگان
چکیده
منابع مشابه
Perceiving illusory contours: figure detection and shape discrimination.
We investigate the relationship between illusory figure detection and discrimination of its shape, asking whether these depend on a single, two separate, or two sequential processes. In a simultaneous detection-discrimination experiment, we presented subjects with brief, backward-masked Kanizsa-type patterns consisting of four "pacmen," arranged as if at the corners of a 60-degree parallelogram...
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Orientation discrimination and tilt aftereffects (TAEs) were measured to determine if the orientation of luminance and illusory contours are processed by separate mechanisms. The assumption was made that if a single mechanism supports the perception of both types of contours, then illusory and luminance contours that support the same level of orientation discrimination will be equally effective...
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Illusory contours are perceived in the absence of any real physical luminance gradients between inducers that are spatially discontinuous (Fig. 1a,b).1–3 It has been controversial whether the perception of these subjective contours arise from higher level cognitive mechanisms that depend on attention and serial search4–6 or from lower level parallel processing in the early automatic, preattenti...
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Geometric and neural models of illusory-contour (IC) synthesis currently use only local contour geometry to derive the shape of ICs. Work on the visual representation of shape, by contrast, points to the importance of both contour and surface geometry. We investigated the influence of surface-based geometric factors on IC shape. The local geometry of inducing-contour pairs was equated in stereo...
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SHAPE DETECTION BY PACKING CONTOURS Qihui Zhu Jianbo Shi Humans have an amazing ability to localize and recognize object shapes from natural images with various complexities, such as low contrast, overwhelming background clutter, large shape deformation and signicant occlusion. We typically recognize object shape as a whole the entire geometric conguration of image tokens and the context they a...
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ژورنال
عنوان ژورنال: Journal of Vision
سال: 2008
ISSN: 1534-7362
DOI: 10.1167/8.11.14