1. Unit 4: Sensation & Perception
Vision

2. The Stimulus Input: Light Energy
Transduction (transform)
Wavelength
Hue (color)
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 Eye The 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 Eye The 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 Processing Visual 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 Processing Feature Detection
Feature detectors

35. Visual Information 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. Young-Helmholtz trichromatic (three color) theory
Color Vision
Young-Helmholtz trichromatic (three color) theory
Red – Green - Blue
Monochromatic vision
Dichromatic vision

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

44. After image