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PSYCH 2220 Perception Lecture 9

PSYCH 2220 Perception Lecture 9. COLOUR Trichromacy cones, three photopigments, long wavelength, medium wavelength, short wavelength, colour matching, 'normal' need three lights, colour blindness Opponency

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PSYCH 2220 Perception Lecture 9

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  1. PSYCH 2220 Perception Lecture 9

  2. COLOUR Trichromacy cones, three photopigments, long wavelength, medium wavelength, short wavelength, colour matching, 'normal' need three lights, colour blindness Opponency adaptation, colour after-effect, lateral inhibition (at level of retinal ganglion cells)

  3. VISUAL ILLUSIONS A classification system: 1 Adaptation illusions 2 Simulation illusions 3 Incompatible cue illusions 4 Geometric illusions

  4. VISUAL ILLUSIONS A classification system: 1 Adaptation illusions 2 Simulation illusions 3 Incompatible cue illusions 4 Geometric illusions

  5. VISUAL ILLUSIONS A classification system: 1 Adaptation illusions 2 Simulation illusions 3 Incompatible cue illusions 4 Geometric illusions

  6. VISUAL ILLUSIONS A classification system: 1 Adaptation illusions 2 Simulation illusions 3 Incompatible cue illusions 4 Geometric illusions

  7. Müller-Lyer Illusion

  8. BOTTOM UP…. TOP DOWN ….

  9. BOTTOM UP 1 eye movements 2 limited acuity 3 physiological confusion

  10. response level cells in a hypercolumn minding their own business

  11. response level when a bar comes on they give a response…

  12. response level But the cells are wired together with INHIBITORY connections

  13. response level so highly active cells inhibit their neighbours the most

  14. response level which releases the higher-firing cells from inhibition and makes them fire more, bringing out the signal better

  15. response level Now we add some other lines..

  16. response level Which activate the cells tuned to those orientations…

  17. response level Which pulls down the response of the vertically tuned cell

  18. A physiological confusion explanation for the Müller-Lyer

  19. BOTTOM UP 1 eye movements 2 limited acuity 3 physiological confusion TOP DOWN 1 empathy 2 “good figure” 3 perspective

  20. big thing far small thing close EMMERT’s LAW If retinal image stays the same then perceived size will depend on distance

  21. The Thatcher Illusion

  22. Do we need to LEARN to see?

  23. EMPIRICIST (all knowledge comes from experience) NATIVIST (knowledge is ‘a priori’; you are born with it)

  24. EVIDENCE 1 Animal behaviour 2 Blind people recovering their sight 3 Babies’ visual development 4 Adaptation experiments 5 Controlled rearing experiments

  25. 1 animal behaviour

  26. Molyneux’s question: “could a man born blind distinguish a sphereand a cube by sight alone?” 2 blind people recovering sight

  27. 3 child development, Fant’z Experiment

  28. 4 adaptation

  29. 4 adaptation

  30. 5 controlled rearing

  31. Blakemore video about development

  32. EVIDENCE Animal behavour Blind people recovering their sight Babies’ visual development Adaptation experiments Controlled rearing experiments ……………………. Nativist … Empiricist & nativist …………. Empiricist & nativist …………… Empiricist ……….. Empiricist

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