perception illusions

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Transcript of perception illusions

Sensation Input of sensory information Process of receiving, converting, and transmitting information from the outside world

Perception-Key Concepts1. 2. 3. 4. Selection Organization Interpretation Subliminal perception and ESP

Figure-Ground Differentiation Major Gestalt principle of perceptual organization We divide world into 2 parts1.Figure Has shape & location in space Has no definite shape and seems to continue beyond figure

1.Ground

Modeled after a ppt slide created by Dr. Kevin Richardson in 1998 and made available through the American Psychological

Gestalt Laws of Perceptual Grouping Top-Down How do we group objects perceptually? Several principles:

Similarity Proximity Continuation Simplicity Closure

Modeled after a ppt slide created by Dr. Kevin Richardson in 1998 and made available through the American Psychological

SimilaritySimilarity grouping suggests horizontal columns

Proximity

Proximity Grouping Suggests Vertical Columns

Continuation

We see a square even though its corners are missing

SimplicityThe lines are naturally grouped as a 3D cube.

The lines are naturally grouped as a 2D pentagon.

Closure Closure Closure

Perceptual Constancies Does our perception of objects around you change if objects get closer or farther away, or if they are moving? No! No! No! No! No! No! No! Why? Because of perceptual constanciesModeled after a ppt slide created by Dr. Kevin Richardson in 1998 and made available through the American Psychological

Size Constancy

Ponzo Illusion: line in the distance appears larger

Click here to see many other fam

Arranged by Gordon Vessels 2005

Retinal Size != Apparent Size Distance cues: relative size of elements, separation, density, clarity, background

The Ames Room

Mller-Lyer Lines Eye-movement theory: Arrowheads influence extent of eye movements

Mller-Lyer Lines Revisited The same illusion through perspective cues

Just plain cool illusions!Click Here

Click here to see inversion illusions on website

All lines below are straight; distorted pattern created by the tiny squares

Caf wall illusion