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4. Visual Sensory Systems
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THE STIMULUS: LIGHT
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Brightness Hue
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THE RECEPTOR SYSTEM: THE EYEBALL AND THE OPTIC NERVE
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The Lens Iris Cornea
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The Visual Receptor System
Location Acuity Sensitivity Color sensitivity Adaptation Differential wavelength sensitivity
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SENSORY PROCESSING LIMITATIONS
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Contrast Sensitivity Color Sensation Night Vision
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BOTTOM-UP VS TOP-DOWN PROCESSING
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Depth perception
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Depth cues Bottom-up processing Accommodation Convergence
Binocular disparity (stereopsis)
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Relative motion (motion parallax)
Top-down processing Linear perspective Relative size Interposition Light and shading Textural gradients Relative motion (motion parallax)
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VISUAL SEARCH AND DETECTION
Where’s Wally?
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Where’s Wally?
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Eye Movement
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Visual Search The Serial Search Model Conspicuity Expectancies
Conclusions
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Detection Signal Detection Theory Sensitivity and Response Bias
Intervention higher sensitivity conservative
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Absolute JUDGMENT
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