'Lightness constancy' diaporamas de présentation

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Primary Questions in the Study of Perception

Primary Questions in the Study of Perception. The physiological question: How are the properties of objects in the environment represented by the activity in the nervous system? The stimulus question: How do we use information from the environment to create perceptions?

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Retina- your CCD

Retina- your CCD. Light. ~120 million rods ~7 million cones Most cones concentrated in the fovea. Signal Processing. Trace the signal through the retina : The retina is a 7-layered structure involved in signal transduction.

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Lightness

486 views • 26 slides

Lightness

412 views • 26 slides

From local motion estimates to global ones - physiology:

From local motion estimates to global ones - physiology:. Motion fields for more complex patterns:. Hildreth (1985): Smoothness of velocity field along the contour. True motion field. Local motion estimates. Smoothest Velocity field. Motion fields for more complex patterns (contd.):.

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Vision: change, lightness, acuity

Vision: change, lightness, acuity. Ganzfeld/whole field: light falling on retina with no visual structure; eventually, perception is of a uniform dark gray field Involuntary eye movements: spontaneous, un conscious, unavoidable movements

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How do we maintain a stable perceptual world?

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. Sensory physiology. Physiological Response. Psychophysics. Physiological psychology.

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Perception

Perception. How we process mental images. Monocular Depth Cues. Relative Clarity Distant objects appear less clear than they are. Moisture exaggerates depth. Linear Perspective Parallel lines seem to come together in the distance.

296 views • 12 slides