1. Our perception is Biased
Johnson Chapter 1
Our perception is Biased

2. Facts about Human Perception & Cognition (Overview of Johnson’s Book)
We perceive what we expect
Our vision is optimized to see structure
We seek and use visual structure
Reading is unnatural
Our color vision is limited
Our peripheral vision is poor

3. Facts about Human Perception & Cognition (cont.)
Our attention is limited; Our memory is imperfect
Limits on attention shape our thought & action
Recognition is easy; recall is hard
Learning from experience & performing learned actions are easy; problem-solving & calculation are hard
Many factors affect learning
We have real-time requirements

4. We Perceive What We Expect
Our perception is biased by:
Our experience
The context
Our goals

5. We Perceive What We Expect!

9. Is the army headed west or east?

11. We tend not to notice things that are unrelated to our goal

12. We Perceive What We Expect
Our perception is biased by:
Our experience
The context
Our goals

13. Context
Fold napkins. Polish silverware. Wash dishes.

14. Context
French napkins. Polish silverware. German Dishes

15. We Perceive What We Expect
Our perception is biased by:
Our experience
The context
Our goals
Missing Context

16. Necker Cube

19. We Perceive What We Expect
Our perception is biased by:
Our experience
The context
Our goals
Inconsistent Context

21. Maurits Cornelis Escher

22. We Perceive What We Expect
Our perception is biased by:
Our experience
The context
Our goals

23. What courses are taught by the Computer Science Department?

24. Design Implications
Avoid ambiguity
Be consistent
Understand the goals

25. New Vaccine Contains Rabies
Avoid Ambiguity
New Vaccine Contains Rabies

26. Design Implications
Avoid ambiguity
Be consistent
Understand the goals

27. Which design is best?

28. Be Consistent

29. Design Implications
Avoid ambiguity
Be consistent
Understand the goals