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  2. Depth perception - Wikipedia

    en.wikipedia.org/wiki/Depth_perception

    Perspective, relative size, occultation and texture gradients all contribute to the three-dimensional appearance of this photo. Depth perception is the ability to perceive distance to objects in the world using the visual system and visual perception. It is a major factor in perceiving the world in three dimensions

  3. Subjective constancy - Wikipedia

    en.wikipedia.org/wiki/Subjective_constancy

    Distance constancy refers to the relationship between apparent distance and physical distance. [8] An illusion example of this would be the moon - when it is near the horizon it is perceived as larger (size constancy) and/or closer to earth than when it is above our heads. Location constancy refers to the relationship between the viewer and the ...

  4. Emmert's law - Wikipedia

    en.wikipedia.org/wiki/Emmert's_law

    Emmert's law has been used to investigate the moon illusion (the apparent enlargement of the moon or sun near the horizon compared with higher in the sky). [7] [8] A neuroimaging study that examined brain activation when participants viewed afterimages on surfaces placed at different distances found evidence supporting Emmert's Law and thus size constancy played out in primary visual cortex ...

  5. Ebbinghaus illusion - Wikipedia

    en.wikipedia.org/wiki/Ebbinghaus_illusion

    The Ebbinghaus illusion or Titchener circles is an optical illusion of relative size perception. Named for its discoverer, the German psychologist Hermann Ebbinghaus (1850–1909), the illusion was popularized in the English-speaking world by Edward B. Titchener in a 1901 textbook of experimental psychology, hence its alternative name. [ 1 ]

  6. Weber–Fechner law - Wikipedia

    en.wikipedia.org/wiki/Weber–Fechner_law

    This can be seen in data collected by Blackwell [23] and plotted by Crumey, [24] showing threshold increment log versus background luminance log for various targets sizes. At daylight levels, the curves are approximately straight with slope 1, i.e. log Δ B {\displaystyle \Delta B} = log B + c o n s t . {\displaystyle B+const.} , implying C ...

  7. Perceived visual angle - Wikipedia

    en.wikipedia.org/wiki/Perceived_visual_angle

    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 ...

  8. List of optical illusions - Wikipedia

    en.wikipedia.org/wiki/List_of_optical_illusions

    An optical illusion of relative size perception. The two black circles are exactly the same size; however, the one on the left seems larger. Disappearing Model: A trompe-l'œil body painting by Joanne Gair. The dress: An optical illusion resulting from the brain's attempt to discount coloured tinting from daylight and other sources. [1]

  9. Moon illusion - Wikipedia

    en.wikipedia.org/wiki/Moon_illusion

    Photographs of the Moon at different elevations also show that its size remains the same. A simple way of demonstrating that the effect is an illusion is to hold a small pebble (say, 0.33 inches or 8.4 millimetres wide) at arm's length (25 inches or 64 centimetres) with one eye closed, positioning the pebble so that it covers (eclipses) the ...