size-distance illusion

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• Size-weight illusion — The size weight illusion, also known as the Charpentier illusion, is named after the French physician Augustin Charpentier.[1] because he was the first to demonstrate the illusion experimentally [2] [3] The illusion occurs when a person… …   Wikipedia

• illusion — illusioned, adj. /i looh zheuhn/, n. 1. something that deceives by producing a false or misleading impression of reality. 2. the state or condition of being deceived; misapprehension. 3. an instance of being deceived. 4. Psychol. a perception, as …   Universalium

• Visual Angle Illusion — The visual angle, V degrees, subtended by a viewed object sometimes looks larger or smaller than its actual value, creating a visual angle illusion (V illusion).These V illusions have been explicitly described by many vision researchers,… …   Wikipedia

• moon illusion —    Also known as Moon size illusion and horizon illusion. All three terms refer to the Moon s apparently increased size when it approaches the horizon, in comparison with its perceived size when it is in the zenith. The ratio of this apparent… …   Dictionary of Hallucinations

• Moon illusion — The Moon illusion is an optical illusion in which the Moon appears larger near the horizon than it does while higher up in the sky. This optical illusion also occurs with the sun and star constellations. It has been known since ancient times, and …   Wikipedia

• Optimum HDTV viewing distance — is the distance that provides the viewer with the optimum immersive visual HDTV experience. Although opinions vary on the exact screen size to distance relationship, formal research and recommendations suggest closer is preferred to further[not… …   Wikipedia

• Ponzo illusion — An example of the Ponzo Illusion. Both horizontal lines are the same size. The Ponzo illusion is a geometrical optical illusion that was first demonstrated by the Italian psychologist Mario Ponzo (1882–1960) in 1913. He suggested that the human… …   Wikipedia

• Müller-Lyer illusion — Two sets of arrows that exhibit the Müller Lyer optical illusion. The set on the bottom shows that all the arrows are of the same length. The Müller Lyer illusion is an optical illusion consisting of a stylized arrow. When viewers are asked to… …   Wikipedia

• Delboeuf illusion — The two black circles are exactly the same size; however, the one on the left seems larger. The Delboeuf illusion is an optical illusion of relative size perception. In the best known version of the illusion, two circles of identical size have… …   Wikipedia

• celestial illusion —    The term celestial illusion is indebted to the Latin noun caelum, which means heaven. It is used to denote a group of *size illusions characterized by an apparent increase in the size of celestial bodies when these are perceived above the… …   Dictionary of Hallucinations

• Alhazen — For the Moon crater, see Alhazen (crater). For the asteroid, see 59239 Alhazen. Alhazen Alhazen (Ibn al Haytham) …   Wikipedia