Perception lesson 2

1. Perception lesson 2

2. Empiricism All knowledge is ultimately based on perceptual experience

3. The subjects you study? Can you list the role perception plays in your different IB subjects? Are there any areas of knowledge where perception plays NO role?

4. Common-sense realism Do you think our senses give us an accurate picture of how the world really is? Perception is passive and gives us an accurate picture of reality

9. http://www.grand-illusions.com/opticalillusions/impossible_motion/http://www.grand-illusions.com/opticalillusions/impossible_motion/

10. Perception is a complex process Sensation and interpretation

11. Interpretation: Context

12. Interpretation: Expectations

13. Interpretation: Expectations The following four slides will be shown very quickly. Try to remember what the four cards are.

18. Can you name them?

19. Can you name them?

20. Illusions from other senses? Can you think of any illusions from our other senses? YouTube - Endless Kaleidocycle and Ever-Rising Scale

21. Perceptual illusions Pass the two blocks around. Which one is colder? Put ice cubes on the blocks and watch

22. Perceptual illusions How did your sense of touch score?!

23. Extension of the senses

24. Electromagnetic spectrum

25. Visible light

26. Visible light λ ≈ 700 nm λ ≈ 420 nm

27. Ultraviolet waves λ ≈ 700 - 420 nm

28. Ultraviolet waves λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm

29. X-rays λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm

30. X-rays λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm λ ≈ 1 – 0.01 nm

31. Gamma rays λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm λ ≈ 1 – 0.01 nm

32. Gamma rays λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm λ ≈ 0.001 – 0.000001nm λ ≈ 1 – 0.01 nm

33. Infrared waves λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm λ ≈ 1 – 0.01 nm λ ≈ 0.001 – 0.000001nm

34. Infrared waves λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm λ ≈ 0.1to 0.001mm λ ≈ 1 – 0.01 nm λ ≈ 0.001 – 0.000001nm

35. Microwaves λ ≈ 700 - 420 nm λ ≈ 0.1to 0.001mm λ ≈ 10 – 100 nm λ ≈ 1 – 0.01 nm λ ≈ 10-12 - 10-14 m

36. Microwaves λ ≈ 700 - 420 nm λ ≈ 10-4 - 10-6 m λ ≈ 10 – 100 nm λ ≈ 1 – 0.01 nm λ ≈ 1 to 0.1cm λ ≈ 10-12 - 10-14 m

37. Radio waves λ ≈ 700 - 420 nm λ ≈ 10-4 - 10-6 m λ ≈ 10 – 100 nm λ ≈ 1 – 0.01 nm λ ≈ 1 to 0.1cm λ ≈ 10-12 - 10-14 m

38. Radio waves λ ≈ 700 - 420 nm λ ≈ 10-4 - 10-6 m λ ≈ 10 – 100 nm λ ≈ 1 – 0.01 nm λ ≈ 1 to 0.1cm λ ≈ 10-1 - 103 m λ ≈ 10-12 - 10-14 m

39. Electromagnetic spectrum λ ≈ 700 - 420 nm λ ≈ 10-4 - 10-6 m λ ≈ 10 – 100 nm λ ≈ 1 – 0.01 nm λ ≈ 10-2 - 10-3 m λ ≈ 10-1 - 103 m λ ≈ 10-12 - 10-14 m

40. Electromagnetic spectrum Long Wavelength Short Wavelength

42. Ultrasound

43. What is really out there?

44. What is really out there? Does the “sweetness” exist in the coke or only in your brain?

45. What is really out there? If we had evolved differently, sensitive to electromagnetic radiation of different frequencies we would not see grass as green at all…….in conclusion the world really has no colour at all! Where is the green in the grass? In the grass or in your brain?

46. What really is out there? If a tree falls in a forest, and nobody is there to hear it, does it make a sound?

47. Two types of sound? Physical – vibrations in the air Experienced – the sound we hear/experience in our brains

48. No experienced sound before life on earth?

49. https://www.youtube.com/watch?v=DKHX71Ug5g4&feature=related