perception

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PERCEPTION


PAY ATTENTION

Selective attention (blindness)

DIVIDED ATTENTION ● Divided attention-focus on more than one task

PROCESSING

●Top-down ●Bottom-up

Top-down processing

●Guided by preexisting knowledge

●Expectancy ●Concept driven ●Schema driven

Bottom-up processing

●Begins with sensory receptors ●Constructs perceptions ●Data driven ●Not influenced by expectations

PERCEPTION

●Process of creating meaningful patterns from raw sensory data

Perceptual Critical Periods ● Blakemore and Cooper (1970)

● Sensory restriction ● Kittens raised without exposure to horizontal lines later had difficulty perceiving horizontal bars.

Müller-Lyer Illusion

Gestalt psychologists ● German ● Early 20th Century ● Noted certain consistencies in the way we integrate bits of sensory stimulation into meaningful whole

● Created rules

Phi Phenomenon-
 illusion of movement ● http://www.yorku.ca/eye/balls.htm

● light show ● https://www.youtube.com/watch? v=MK712Ky_Fxk&feature=share&list=UU5ZcyVLBHOjL Ez6PATLM4kw&index=2

Figure-ground

Figure-ground

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Figure-Ground-ambiguous Rubin Vase

Necker Cube

Law of Pragnanz

Gestalt Perceptual Organization

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Law of Proximity

Who do you assume is together?

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Law of Similarity

Law of Similarity

Law of Similarity

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Law of Continuity

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Law of closure

Real life use of Gestalt principles

PERCEPTUAL CONSTANCIES

Color Constancy

Color Constancy

Size Constancy

Size Constancy

Size Constancy

Shape Constancy

DEPTH PERCEPTION ● Monocular cues ● Binocular cues

Visual cliff

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Monocular cues ● Motion parallax ● Interposition ● Relative height ● Shadowing ● Texture gradient ● Linear Perspective

Motion parallax

Interposition

Relative Height

Lincoln’s hat illusion

Shadowing

More Shadowing

Texture Gradient

And again…

Linear Perspective

Ponzo Illusion

DEPTH PERCEPTION ● Binocular Cues: ●Retinal Disparity ●Convergence

RETINAL DISPARITY

Convergence

4 CATEGORIES OF PERCEPTION

●Pattern Perception ●Organization ●Constancy ●Depth Perception

McGurk Effect

Visual Capture

Perceptual Set

Remember mental set

PERCEPTUAL ADAPTATION ● DEMO

STROOP EFFECT

Expectations

Hering Illusion

Hermann Grid

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