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The Four Perceptual Constancies

Perceptual constancy enables us to percieve an object as unchanging despite a changing stimulus

The four perceptual constancies are shape, size, color, and brightness

Bibliography

Shape

http://www.yorku.ca/eye/shape1.htm

<http://www.cogsci.bme.hu/~ikovacs/latas2005/prepIII_1_files/j_fig4.jpg>

<http://www.webexhibits.org/causesofcolor/1D.html>

<http://www.psy.ritsumei.ac.jp/~akitaoka/light5e.html>

<https://engineering.purdue.edu/~bouman/ece637/notes/ColorConstancy/color/>

<http://www.modelmayhem.com/po.php?thread_id=260367>

  • depending on the angle of our view, an object whose actual shape cannot change seems to change shape
  • percieve the form of familiar objects as constant while retinal images of them change
  • percieved shape stays constant despite changes caused by the movement relative to the observer

Size

  • perciveing objects as having a constant size, even while our distance from them varies
  • percieving an objects distance gives us cues to its size which results in size-distance relationship

Brightness

Color

  • the light that a surface seems to reflect gives a perception of the lightness of the surface
  • the percieved brightness of an object remains the same despite changing conditions of illumination
  • <http://www.psy.ritsumei.ac.jp/~akitaoka/light5e.html>
  • the experience of color depends on the surrounding context
  • <https://engineering.purdue.edu/~bouman/ece637/notes/ColorConstancy/color/>
  • color will remain roughly constant as the lighting and wavelengths shift
  • comparisons govern our perceptions
  • we percieve the color of a surface to be the same, even though there are changes in shade
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