perceptual aftereffect
   see aftereffect.

Dictionary of Hallucinations. . 2010.

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  • Contingent perceptual aftereffect — Contingent aftereffects are studied in human perception and can be defined as illusory percepts that are apparent on a test stimulus after exposure to an induction stimulus for an extended period. Contingent aftereffects can be contrasted with… …   Wikipedia

  • contingent perceptual aftereffect —    see contingent aftereffect …   Dictionary of Hallucinations

  • aftereffect —    Also known as aftersensation and perceptual aftereffect. All three terms refer to the illusory visual perception that may follow prolonged exposure to a particular visual stimulus. As a rule, aftereffects present themselves in the inverted… …   Dictionary of Hallucinations

  • contingent aftereffect —    Also known as contingent perceptual aftereffect. Both terms are used to denote a type of aftereffect that is dependent on (i.e. contingent with) the orientation of the perceived object with respect to the retina. An example is the * McCollough …   Dictionary of Hallucinations

  • Optical illusion — This article is about visual perception. For the Time Requiem album, see Optical Illusion (album). An optical illusion. The square A is exactly the same shade of gray as square B. See checker shadow illusion. An optical illusion (also called a… …   Wikipedia

  • perception — perceptional, adj. /peuhr sep sheuhn/, n. 1. the act or faculty of apprehending by means of the senses or of the mind; cognition; understanding. 2. immediate or intuitive recognition or appreciation, as of moral, psychological, or aesthetic… …   Universalium

  • 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

  • visual illusion —    Also known as optical illusion. Both terms are commonly used to denote a visual percept that has its basis in a stimulus derivative of the extra corporeal environment (also referred to as a point de repère) which is either misperceived or… …   Dictionary of Hallucinations

  • Akinetopsia — Akinetopsia, also known as cerebral akinetopsia or motion blindness, is an extremely rare neuropsychological disorder in which a patient cannot perceive motion in their visual field, despite being able to see stationary objects without issue. For …   Wikipedia

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