Chapter 5 Part 3 - Perception(part 3 Today's topics...

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Today’s topics Illusions Bottom-up vs. Top-down processing Three-dimensional shape recognition Specialization and the Binding Problem Perception (part 3)
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Perception is an Active Process Chapter 5: Perception Perception is an active process We actively interpret information from environment (e.g. ambiguous figures) Perceptions not simply based on physical stimulus However, this means we can also misinterpret information! Illusion a misinterpretation of sensory stimuli
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Tabletop Illusion Chapter 5: Perception Tabletop illusion The tabletop on the left looks longer and thinner than the one on the right They are actually the same size (without the table legs!) Why does this happen? Depth cues make us automatically perceive the figures as three- dimensional The lengths of lines going off into the “distance” appear longer than they do when we view them oriented in the horizontal direction http://www.michaelbach.de/ot/sze_shepardTables/index.html
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Ponzo Illusion Chapter 5: Perception Ponzo illusion The top rectangle seems slightly larger than the bottom one Why does this happen? Depth cues make the top rectangle look farther down the tracks Since the retinal images are the same size, but the top rectangle appears to be farther away, we perceive it to be a larger object
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Moon Illusion Chapter 5: Perception Moon illusion The moon looks much larger when it’s on the horizon compared to when it is high in the sky Why does this happen? Depth cues present when the moon is on the horizon make the horizon moon look farther away than when it is high in the sky (with no distance cues) Since the retinal images are the same size, but the horizon moon seems farther away, we perceive the horizon moon to be a larger object
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Ames Room Illusion Chapter 5: Perception Ames Room illusion The Ames Room causes two people of equal size to appear very different in size Why does this happen? From this particular perspective, the room appears to be a normal, rectangular room The room is actually shaped so that the left corner is about twice as far away as the right corner We perceive the men to be at the same distance, so we perceive the difference in retinal image size as indicating a difference in their actual size http://www.youtube.com/watch?v=Ttd0YjXF0no http://www.youtube.com/watch?v=6aJlX0AEWys&feature=related
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Benefits of Assumption in Perceptual System Chapter 5: Perception Perception is not perfect Our perceptual system doesn’t always make the right assumptions about a stimulus It’s usually correct though, and these assumptions generally help us in interpreting a stimulus Sometimes our sensory input is ambiguous and we MUST make assumptions about it Assumptions help us make quicker judgments – rather than wait for complete information, we make assumptions
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Process-Model Approach Chapter 5: Perception Process-model approach to perception Proposes that object recognition occurs
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