1. Sensation 26. Young-Helmholtz trichromatic theory 51. perceptual adaptation
2. Perception 27. opponent-process theory 52. perceptual set
3. Bottom-up processing 28. frequency 53. olfactory bulb
4. Top-down processing 29. middle ear 54. parallel processing
5. selective attention 30. cochlea
6. Inattentional blindness 31. inner ear
7. Change blindness 32. place theory
8. psychophysics 33. frequency theory
9. absolute threshold 34. conduction hearing loss
10. signal detection theory 35. cochlear implant
11. subliminal 36. kinesthesis
12. difference threshold 37. vestibular sense
13. Weber's Law 38. gate-control theory
14. sensory adaptation 39. sensory interaction
15. transduction 40. gestalt
16. pupil 41. figure-ground
17. iris 42. grouping
18. Lens 43. depth perception
19. retina 44. visual cliff
20. rods 45. binocular cues
21. cones 46. retinal disparity
22. optic nerve 47. monocular cues
23. blind spot 48. phi phenomenon
24. fovea 49. perceptual constancy
25. feature detectors 50. color constancy
2. Perception 27. opponent-process theory 52. perceptual set
3. Bottom-up processing 28. frequency 53. olfactory bulb
4. Top-down processing 29. middle ear 54. parallel processing
5. selective attention 30. cochlea
6. Inattentional blindness 31. inner ear
7. Change blindness 32. place theory
8. psychophysics 33. frequency theory
9. absolute threshold 34. conduction hearing loss
10. signal detection theory 35. cochlear implant
11. subliminal 36. kinesthesis
12. difference threshold 37. vestibular sense
13. Weber's Law 38. gate-control theory
14. sensory adaptation 39. sensory interaction
15. transduction 40. gestalt
16. pupil 41. figure-ground
17. iris 42. grouping
18. Lens 43. depth perception
19. retina 44. visual cliff
20. rods 45. binocular cues
21. cones 46. retinal disparity
22. optic nerve 47. monocular cues
23. blind spot 48. phi phenomenon
24. fovea 49. perceptual constancy
25. feature detectors 50. color constancy