Chapter 5 Part 3 - Today’s topics • Illusions •...

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Unformatted text preview: Today’s topics • Illusions • Bottom-up vs. Top-down processing • Three-dimensional shape recognition • Specialization and the Binding Problem Perception (part 3) 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 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 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 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 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 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 Process-Model Approach Chapter 5: Perception Process-model approach to perception – Proposes that object...
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This note was uploaded on 11/23/2010 for the course SOCIAL SCI 68045 taught by Professor Hagedorn during the Fall '09 term at UC Irvine.

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Chapter 5 Part 3 - Today’s topics • Illusions •...

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