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• Perceived_visual_angle abstract "In human visual perception, the visual angle, denoted θ, subtended by a viewed object sometimes looks larger or smaller than its actual value. One approach to this phenomenon posits a subjective correlate to the visual angle: the perceived visual angle or perceived angular size. An optical illusion where the physical and subjective angles differ is then called a visual angle illusion or angular size illusion.Angular size illusions are most obvious as relative angular size illusions, in which two objects that subtend the same visual angle appear to have different angular sizes; it is as if their equal-sized images on the retina were of different sizes. Angular size illusions are contrasted with linear size illusions, in which two objects that are the same physical size do not appear so. An angular size illusion may be accompanied by (or cause) a linear size illusion at the same time.The perceived visual angle paradigm begins with a rejection of the classical size–distance invariance hypothesis (SDIH), which states that the ratio of perceived linear size to perceived distance is a simple function of the visual angle. The SDIH does not explain some illusions, such as the Moon illusion, in which the Moon appears larger when it is near the horizon. It is replaced by a perceptual SDIH, in which the visual angle is replaced by the perceived visual angle. This new formulation avoids some of the paradoxes of the SDIH, but it remains difficult to explain why a given illusion occurs.This paradigm is not universally accepted; many textbook explanations of size and distance perception do not refer to the perceived visual angle, and some researchers deny that it exists. Some recent evidence supporting the idea, reported by Murray, Boyaci and Kersten (2006), suggests a direct relationship between the perceived angular size of an object and the size of the neural activity pattern it excites in the primary visual cortex.".
• Perceived_visual_angle thumbnail VisualAngleAboveHorizonDefs.svg?width=300.
• Perceived_visual_angle wikiPageExternalLink index.html.
• Perceived_visual_angle wikiPageID "19728798".
• Perceived_visual_angle wikiPageRevisionID "604937717".
• Perceived_visual_angle hasPhotoCollection Perceived_visual_angle.
• Perceived_visual_angle last "McCready".
• Perceived_visual_angle year "1963".
• Perceived_visual_angle year "1965".
• Perceived_visual_angle year "1985".
• Perceived_visual_angle year "1999".
• Perceived_visual_angle subject Category:Angle.
• Perceived_visual_angle subject Category:Optical_illusions.
• Perceived_visual_angle subject Category:Visual_perception.
• Perceived_visual_angle type NaturalPhenomenon111408559.
• Perceived_visual_angle type OpticalIllusion111490463.
• Perceived_visual_angle type OpticalIllusions.
• Perceived_visual_angle type OpticalPhenomenon111490638.
• Perceived_visual_angle type Phenomenon100034213.
• Perceived_visual_angle type PhysicalEntity100001930.
• Perceived_visual_angle type PhysicalPhenomenon111419404.
• Perceived_visual_angle type Process100029677.
• Perceived_visual_angle comment "In human visual perception, the visual angle, denoted θ, subtended by a viewed object sometimes looks larger or smaller than its actual value. One approach to this phenomenon posits a subjective correlate to the visual angle: the perceived visual angle or perceived angular size.".
• Perceived_visual_angle label "Perceived visual angle".
• Perceived_visual_angle sameAs m.04n3fpn.
• Perceived_visual_angle sameAs Q7166989.
• Perceived_visual_angle sameAs Q7166989.
• Perceived_visual_angle sameAs Perceived_visual_angle.
• Perceived_visual_angle wasDerivedFrom Perceived_visual_angle?oldid=604937717.
• Perceived_visual_angle depiction VisualAngleAboveHorizonDefs.svg.
• Perceived_visual_angle isPrimaryTopicOf Perceived_visual_angle.