Sensation

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Chapters 7 8
Sensation Perception
Part 1
2

• Part 1
• Sensory Processing
• Vision
• Part 2
• Other Sensory Systems

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Sensation Vs. Perception
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Psychophysics

• Absolute threshold
• Just Noticeable Difference (JND)
• Webers Law
• ?I/I

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Transduction

• The process by which sense organs convert energy
  from the environmental events into neural
  activity
• Receptors
• Photoreceptors
• Hair cells
• Taste receptor cells
• Cilia

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The Visible Spectrum
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The Eye

• Photoreceptor Cells
• Rods
• Cones

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Color Vision

• Wavelength
• 3 Types of Cones
• Blue (short)
• Green (medium)
• Red (long)

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Theories of Color Vision

• Young-Helmholtz Trichromatic Theory
• Opponent Process Theory
• Negative Afterimages

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Defects in Color Vision

• Red/Green Color Blindness
• Blue/Yellow Color Blindness
• Cerebral Achromatopsia

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Perception of Form

• Primitive Features
• Figure and Background (Ground)
• Gestalt Psychology and Perceptual Grouping

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Perception of Form

• Law of Proximity

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Perception of Form

• Law of Similarity

X X X O O O X X X O O O X X X X X X O O
O X X X O O O X X X X X X O O O X X X O O O X X X
XXXXXXXXXXXXXXX OOOOOOOOOOOOOOO XXXXXXXXXXXXXXX OO
OOOOOOOOOOOOO
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Perception of Form

• Law of Continuity

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Perception of Form

• Law of Closure

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Perception of Form

• Law of Pragnanz (Good Figure)

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Types of Processing

• Top Down Processing
• Bottom Up Processing

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Depth Perception

• Binocular Cues
• Monocular Cues

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Binocular Cues

• Retinal Disparity
• Convergence

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Monocular Cues

• Interposition
• Linear Perspective
• Relative Size
• Texture Gradient
• Relative Motion
• Motion Parallax

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Some Fun Visual Illusions