1. Illusions and Other Visual Defects CITA 6016 Food Sensory Analysis University of Puerto Rico Food Science & Technology

2. Visual Illusions Brain misinterpretation of the presented visual information See http://www.michaelbach.de/ot/ for a full tour of exampleshttp://www.michaelbach.de/ot/

3. Count the black dots!

4. Are the wheels turning?

5. Which side is up?

6. Which end is closer to you?

7. Parallel or sloping lines?

8. How many legs?

9. Look at the dot. Where’s the haze?

10. Focus on the dot and move.

11. Are purple lines straight?

12. Which center is larger?

13. Ghostly dots?

14. Man or Liar?

15. How many tines in the fork? (two, but can you see three?) More examples What does this say? Look again. Are the sides of the square curved or straight? Check with a straight edge.

16. More examples How many colors? (two) Are the diagonal lines parallel? (yes) Do you see a man playing a sax or a woman in shadow? Can you see both an old lady and a young lady?

17. Right or Left Brain The brain is a great parallel processor for visual information. Identifies differences Fill in blanks …but can get in trouble

18. Identifies differences

19. Fill in blanks Aoccdrnig to a rscheearch at an Elingsh uinervtisy, it deosn't mttaer in waht oredr the ltteers in a wrod are, the olny iprmoetnt tihng is taht frist and lsat ltteer is at the rghit pclae. The rset can be a toatl mses and you can sitll raed it wouthit porbelm. Tihs is bcuseae we do not raed ervey lteter by it slef but the wrod as a wlohe

20. Internal fight

21. Blindness Some people cannot see some colors … can you?

22. Normal Color Vision Red/Green Color Blind Blue/Yellow Color Blind Blindness

23. Normal Color Vision Red/Green Color Blind Blue/Yellow Color Blind Blindness

24. Normal Color Vision Red/Green Color Blind Blindness

25. What numbers do you see?

29. What shapes do you see?

33. Carry Over Effects Vision sensors saturate and keep “memory” of the previously seen image with contrasting colors

34. Look at the four dots for 10 seconds.

35. What do you see?

36. Try this one…

37. What do you see?

38. …and this one?

39. What do you see?

40. …and this one?

41. What do you see?

42. Conclusion Don’t believe everything you see Be aware that panelists are human too and may unadvertedly make mistakes