The Neural Representation of Illusory Contours
Author | : Marianne Maertens |
Publisher | : |
Total Pages | : 165 |
Release | : 2006 |
Genre | : |
ISBN | : 9783832255350 |
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Author | : Marianne Maertens |
Publisher | : |
Total Pages | : 165 |
Release | : 2006 |
Genre | : |
ISBN | : 9783832255350 |
Author | : Susan Petry |
Publisher | : Springer Science & Business Media |
Total Pages | : 802 |
Release | : 2012-12-06 |
Genre | : Psychology |
ISBN | : 1461247608 |
The Perception of Illusory Contours is a complete and comprehensive volume on one of the most important phenomena in modern perception research. An illusory contour is a demonstration in which people perceive edges, surfaces, objects and colors that have no physical reality. The international group of distinguished researchers which comprise the contributors to the volume present new theoretical interpretations and data in addition to reviewing the extensive literature on this topic. The volume begins with an introduction to the research on and theories behind illusory contours and their applications to other areas of perception, cognitive science and art. The collection also features English language translations of the seminal papers by Schumann, Ehrenstein, and Kanizsa, the scientists who originally discovered and investigated the phenomenon. The Perception of Illusory Contours contains the most comprehensive set of illusory contour figures ever assembled. The volume is a most significant reference work in an area of research at the critical intersection of perception, cognitive science, visual neurophysiology, and artificial intelligence.
Author | : Brian Ringer |
Publisher | : |
Total Pages | : 27 |
Release | : 1992 |
Genre | : Computer vision |
ISBN | : |
Furthermore, the model explains the three major perceptual effects associated with illusory contours: oriented contour perception, depth effects and increased brightness."
Author | : Brian Ringer |
Publisher | : |
Total Pages | : 80 |
Release | : 1992 |
Genre | : Computer vision |
ISBN | : |
Furthermore, the model explains the three major perceptual effects associated with illusory contours: oriented contour perception, depth effects and increased brightness."
Author | : Susan Petry |
Publisher | : Springer |
Total Pages | : 320 |
Release | : 1988-10-19 |
Genre | : Psychology |
ISBN | : 9781461291442 |
The Perception of Illusory Contours is a complete and comprehensive volume on one of the most important phenomena in modern perception research. An illusory contour is a demonstration in which people perceive edges, surfaces, objects and colors that have no physical reality. The international group of distinguished researchers which comprise the contributors to the volume present new theoretical interpretations and data in addition to reviewing the extensive literature on this topic. The volume begins with an introduction to the research on and theories behind illusory contours and their applications to other areas of perception, cognitive science and art. The collection also features English language translations of the seminal papers by Schumann, Ehrenstein, and Kanizsa, the scientists who originally discovered and investigated the phenomenon. The Perception of Illusory Contours contains the most comprehensive set of illusory contour figures ever assembled. The volume is a most significant reference work in an area of research at the critical intersection of perception, cognitive science, visual neurophysiology, and artificial intelligence.
Author | : Ruth Kimchi |
Publisher | : Psychology Press |
Total Pages | : 904 |
Release | : 2003-09-12 |
Genre | : Psychology |
ISBN | : 1135647232 |
This book presents an overview of different frameworks for understanding perceptual organization, and a state-of-the-art summary of the domain. It describes findings from visual search, illusory contours, and object recognition using electrophysiological measures.
Author | : J. Skrzypek |
Publisher | : |
Total Pages | : 27 |
Release | : 1991 |
Genre | : |
ISBN | : |
Author | : B. Ringer |
Publisher | : |
Total Pages | : 80 |
Release | : 1992 |
Genre | : |
ISBN | : |
Author | : Mark Anthony Halko |
Publisher | : |
Total Pages | : 298 |
Release | : 2008 |
Genre | : |
ISBN | : |
Abstract: The human visual system processes images projected to the retina and transforms this information into representations of objects in the real world. A fundamental stage in the transformation is extraction of visual contours and surfaces. In part, contour identification is performed by neurons sensitive to luminance edges (Hubel & Wiesel, 1962); however, contours and surfaces can also be perceived in instances without explicit luminance edges (Kanizsa, 1955; Schumann, 1900). These phenomena, known as illusory contours, drive visual cortical responses (Mendola et al., 1999; von der Heydt et al., 1984) and offer an important window into the mechanisms of contour and surface perception. First, a novel display, the Chomping Pacman (CP) illusion, is described. Illusory contour clarity is enhanced relative to traditional illusory contour figures. The CP illusion is combined with a method of adjustment technique to dissect contributions of three mechanisms of contour completion: extrapolation, interpolation, and figural processes. When occlusion cues are present, one or more mechanisms are blocked, yet modal (or visible) contours are still observed to persist. These studies question contour theories based solely on local cues without figural mechanisms. Second, functional MRI (fMRI) was employed to image human brain activity when subjects viewed the CP illusion. Activity in lateral occipital (LO) cortex was observed when contours were formed with or without the percept of a complete figure, indicating LO is a site of both contour and figure completion, contrary to previous reports of figure completion only in LO (Stanley & Rubin, 2003). Figure activity was found in all midlevel visual regions, intraparietal sulcus (IPS), LO, MT and V4, suggesting figure-based mechanisms of completion involve areas in addition to LO. Finally, fMRI was utilized to investigate changes in brain activity that occur with increases in the perceptual vividness of an illusory contour figure. Perceptual vividness was enhanced via coherent motion cues and via neon color spreading (NCS) in the Chomping Pacman display. A brain area encoding perceptual vividness should give greater activation for illusory figures than for non-figures, for motion illusory figures than for static illusory figures, and for NCS illusory figures than for achromatic illusory figures. Five visual cortical areas met these criteria, areas: V3B, hV4, LOCvt, IPS2, and IPS3. These results demonstrate that perceptual vividness of illusory contour figures is reflected in the activity in both the dorsal and ventral visual streams for both color and motion percepts.
Author | : Asim Roy |
Publisher | : Frontiers Media SA |
Total Pages | : 147 |
Release | : 2018-09-28 |
Genre | : |
ISBN | : 2889455963 |
This eBook contains ten articles on the topic of representation of abstract concepts, both simple and complex, at the neural level in the brain. Seven of the articles directly address the main competing theories of mental representation – localist and distributed. Four of these articles argue – either on a theoretical basis or with neurophysiological evidence – that abstract concepts, simple or complex, exist (have to exist) at either the single cell level or in an exclusive neural cell assembly. There are three other papers that argue for sparse distributed representation (population coding) of abstract concepts. There are two other papers that discuss neural implementation of symbolic models. The remaining paper deals with learning of motor skills from imagery versus actual execution. A summary of these papers is provided in the Editorial.