Perception_3_faces(2)

Perception_3_faces(2) - How is it that youre able to...

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Face Recognition: A Curious Application of Pattern Recognition Prof. Susan Brennan http://www.psychology.sunysb.edu/sbrennan-/ How is it that you’re able to recognize other people? “I see a person” “I see my friend Harry” How many people do you know? Is there any other kind of pattern recognition you’re as good at as faces? (Anyone really bad at recognizing faces?) How do people recognize faces? Consider these types of theories: Template theories Feature theories Structure theories Prototype theories Feature theories Patterns are represented in memory by their parts. In perception, the parts are first recognized and then assembled into a meaningful pattern. Piecemeal (as opposed to holistic)
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What are the distinctive features for faces ? Revisit Eleanor Gibson ʼ s criteria: Each feature should be present in some patterns and absent in others A feature should be invariant (unchanged) for all instances of a particular pattern Each pattern has a unique combination of features The number of features should be fairly small A set of features is evaluated by how well it can predict perceptual confusions. Are eyes, noses, and mouths features ? - NO! Revisit: Problems w/ feature theories How to determine the right set of features? What about the relationships between features? What if all the features are present in the pattern, but scrambled? Features theories predict: No problem! (and that’s the problem.) Face recognition is holistic But can a structural theory explain face recognition? …not piecemeal. The relationships between features are critically Important. Who are these people? Same or different?
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Who are these people? Same or different? Inspiration: Caricatures “More like the face than the face itself” What are the distinctive features of a face - say, Richard Nixon’s??? Ski jump nose Jowly face Curly-textured hair Receding bays in hairline Boxy chin (David Perkins, 1975) A B C D E F Contraindicated features: Worse than missing features (Perkins, 1975) Face recognition (Piecemeal or holistic?) (Structural?) (A “special” case of pattern recognition?) What does our theory of face recognition have to account for?
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We see faces everywhere. Image from
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Perception_3_faces(2) - How is it that youre able to...

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