05 Perceiving Objects and Scenes

05 Perceiving Objects and Scenes - 1 Perceiving Objects and...

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9/27/2016 1 Perceiving Objects and Scenes WEEK 5 Lecture Outline Perceptual ambiguities Perceptual organization Perceptual segregation Perceiving scenes Hierarchy Perceptual Ambiguities Inverse projection problem: The retinal image does NOT specify a stimulus, because the same retinal image could be caused by any one of infinite possible stimuli. Holy crackers, she is tiny! Perceptual Ambiguities Weak/incomplete signal Object can be hidden (masked) Scene can be “noisy” Perceptual Ambiguities Objects look different from different angles. Are they different objects? Viewpoint invariance: Object properties remain the same, regardless of viewing angle. Perceptual Organization & Segregation GESTALT PSYCHOLOGY Gestalt Psychology Reaction to Structuralism Hermann von Helmholtz Wilhelm Wundt Perceptions are “built” from elements sensations Mind is holistic Perceives objects as whole objects 1 2 3 4 5 6 7 8 9
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9/27/2016 2 We notice “features” later perceptual organization Rejection of Structuralism by Apparent Motion Apparent Motion: An illusion of movement perception that occurs when stimuli in different locations are flashed one after another with the proper timing. Apparent/Illusory Motion Demo 10 11 12 Illusory contours Structuralists proposed that what we perceive is based in what is there. Image (a) shows 2 partial circles You can see that. Image (b) shows 3 partial circles You can see that. You also see a triangle. Image (c) shows 3 partial circles and 6 lines What do you see? Gestalt Psychologists drop mic.
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  • Fall '07
  • Green
  • Perceptual Organization, Laws of Perceptual Organization, Perceptual Organization & Segregation, perceptual segregation

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