Visual illusions

• Size constancy


  • We keep our original perception of the size of an object although the information changes when received.

  e.g, If you look down at people from a building, they look small even though we know they are not.
• Visual illusions


  • Happen when our visual perception is tricked into seeing something inaccurately.
• Misinterpreted depth cues


  • We wrongly apply the rules of depth perception.
  • e.g, ponzo illusion or the muller lyer illusion, where we perceive these lines to be different things, when they are not.
• Ambiguity


  • The brain cannot decide which interpretation to choose when there are different ones.
  • Our brain would occasionally 'flip' between the two.
  • e.g, Necker's cube or Rubin's vase which can be perceived as two faces
• Fiction


  • Person starts to see something in the image that isn't actually there.
  • e.g, Kanizsa triangle, which makes you think there is a triangle there when it is really empty space.