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Vision

Vision. Unit 4: Sensation & Perception. The Stimulus Input: Light Energy. Transduction (transform) Wavelength Hue (color) Wavelength Intensity Wave amplitude. Electromagnetic Energy Spectrum. Electromagnetic Energy Spectrum. Electromagnetic Energy Spectrum.

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Vision

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  1. Vision Unit 4: Sensation & Perception

  2. The Stimulus Input: Light Energy • Transduction (transform) • Wavelength • Hue (color) • Wavelength • Intensity • Wave amplitude

  3. Electromagnetic Energy Spectrum

  4. Electromagnetic Energy Spectrum

  5. Electromagnetic Energy Spectrum

  6. The Physical Property of Waves

  7. The Physical Property of Waves

  8. The Physical Property of Waves

  9. The Physical Property of Waves

  10. The Physical Property of Waves

  11. The Eye • Cornea • Pupil • Iris • Lens • accommodation • Retina

  12. The Structure of the Eye

  13. The Structure of the Eye Cornea = outer covering of the eye.

  14. The Structure of the Eye Pupil = the adjustable opening in the center of the eye through which light enters.

  15. The Structure of the Eye • Iris = a ring of muscle tissue that forms the colored portion of the eye around the pupil and controls the size of the pupil opening. • The iris dilates/constricts in response to changing light intensity

  16. The Structure of the Eye Lens = the transparent structure behind the pupil that changes shape to help focus images on the retina.

  17. The Structure of the Eye Retina = the light-sensitive inner surface of the eye, containing the receptor rods and cones plus layers of neurons that begin the processing of visual information.

  18. The EyeThe Retina • Rods and Cones Rods Cones

  19. Rods versus Cones

  20. The Retina’s Reaction to Light

  21. The Retina’s Reaction to Light

  22. The Retina’s Reaction to Light

  23. The Retina’s Reaction to Light

  24. The Retina’s Reaction to Light

  25. The EyeThe Retina • Optic nerve • Blind spot • Fovea

  26. The Structure of the Eye Blind Spot = the point at which the optic nerve leaves the eye, creating a “blind” spot because no receptor cells are located there.

  27. The Structure of the Eye Fovea = the central focal point in the retina, around which the eye’s cones cluster.

  28. The Structure of the Eye Optic Nerve = the nerve that carries neural impulses from the eye to the brain.

  29. Visual Information ProcessingVisual Cortex

  30. Pathways from the eyes to the visual cortex

  31. Pathways from the eyes to the visual cortex

  32. Pathways from the eyes to the visual cortex

  33. Pathways from the eyes to the visual cortex

  34. Visual Information ProcessingFeature Detection • Feature detectors

  35. Visual Information ProcessingParallel Processing • Parallel processing • Blind sight

  36. Visual information processing

  37. Visual information processing

  38. Visual information processing

  39. Visual information processing

  40. Visual information processing

  41. Visual information processing

  42. Color Vision • Young-Helmholtz trichromatic (three color) theory • Red – Green - Blue • Monochromatic vision • Dichromatic vision

  43. Color Vision • Opponent-process theory • Three sets of colors • Red-green • Blue-yellow • Black-white • Afterimage

  44. After image

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