Visual illusions

• Size constancy

  The brain perceives familiar objects as a constant size despite the size of the image they produce on our retina changing with distance
• Misinterpreted depth cue

  Objects in the distance that appear smaller aee alsclaed up by our brain si they look normal size

  Sometimes the brain sees distance when there isnt any
• Depth cues- Ponzo illusion

  Converging lines give the illusion of distance

  The brain uses size constancy and mentally scales up the more distant line while mentally scaling down the closer line
• Depth cues- Müller-Lyer illusion

  Outgoing fins are shaped like the inside corner of a room which is stretching away from us

  Ingoing fins are shaped like the outside of a buildin, projecting out

  These give the illusion of near/far

  We mentally scale up the line that appears closer, so it appears longer
• Ambiguous figure

  A type of visual illusion where there are two possible interpretations of the same image, the brain cannot which to choose
• Ambiguous- Necker cube

  The sake omage of a cube can either be perceived as pointing up towards the right, or down towards the left
• Fiction

  Visual illusion that causes the brain to see something that is not there
• Fiction- Kanizsa triangle

  Illusory contours to create the impression that a second triangle is overlapping the first one