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How do we maintain a stable perceptual world?

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Presentation on theme: "How do we maintain a stable perceptual world?"— Presentation transcript:

1 How do we maintain a stable perceptual world?
Distal vs. Proximal Stimulus Unconscious inference vs. higher-order patterns in the stimulus Lightness Constancy Shape Constancy Size Constancy

2 Sensory physiology Physiological psychology Psychophysics creativity
Perception Sensory physiology Physiological psychology Psychophysics Physical Stimulus Physical Stimulus Physiological Response Sensory Experience Sensory Experience creativity memory motivation attention learning

3 Lightness constancy Shape constancy Size constancy
One’s judgment of an object’s lightness remains constant under varying levels of illumination. Shape constancy One’s judgment of an object’s shape remains constant at varying viewing angles. Size constancy One’s judgment of an object’s size remains constant at varying distances.

4 Incident light (illumination)
Lightness constancy judgments are characteristically based on the albedo: Reflected light (luminosity) Albedo = Incident light (illumination)

5 The issue of shape constancy…

6

7 The issue of shape constancy…

8 Cues for distance or depth
(depth perception) Binocular cues Monocular cues

9 Binocular cues Convergence (oculomotor)* Retinal disparity
(See Gleitman, p. 205) *…involves kinesthetic feedback

10 Convergence as a binocular depth cue:
(The role of kinesthetic feedback) (far) (near)

11 2. Monocular cues Non-motion Motion Motion parallax Optic flow
Accommodation (oculomotor)* *…involves kinesthetic feedback Pictorial (static) cues Interposition Texture gradients Light and shadow Linear perspective Aerial perspective Horizon

12 Interposition (occlusion)

13 Light and shadow as a monocular depth cue

14 Linear perspective

15 (Appears farther) (Appears closer) (Appears closer) (Appears farther)

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