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Perception
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Overview Perceptual Problems Solved by the Brain Perceptual Strategies Used by the Brain What do Illusions Tell Us?
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Perceptual Problems Solved by the Brain The environment is three dimensional but the stimulation on the retinas is only two dimensional Perceptual constancy: we can perceive the same object even when the information reaching us varies Size constancy Color constancy What about those blind spots?
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The Moon Illusion Problems for depth perception: The retinal image is two dimensional Size of the retinal image depends on both distance of the object and size of the object
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Perceptual Strategies Used by the Brain Context: use surrounding information Example: Muller-Lyer Illusion
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Perceptual Strategies Used by the Brain Top-Down Processing: use knowledge and experience Example: subjective contours
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Gestalt Strategies The brain makes assumptions about the world that aid perception These assumptions are based on the Law of Pragnanz: perceive the simplest possible pattern Examples: Proximity Similarity Closure
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What Do Illusions Tell Us? Perception is not always accurate (but it usually is) Things that trick the brain can reveal how the brain works
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