1. IST 331 class 8 [5 min.] frank ritter, 21sep15 Computers still off Questions? Abstracts back, Labs tuesday Ch. 4, perception, today Work on learning

2. Ch 6: Learning Transfer of learning Expertise, time on task, changing strategies Why? Changes users, solves problems, some like it

3. Ch. 3 Fitts Law (reprise) Time to move = –Constant + rate * ID –150 + 100 log2(2d/w) ms –70 log2(d/w + 0.5) ms Implications –Make d short –Make W large –W on edge is infinite –Make d = 0 –Get better rate –Move to keystroke

4. What we are examaning today

5. Ch. 4 - Behavioral aka Perception Basic terms –JND –Habituation –SDT Eyes –Major components, how they work –Popout –Gestault

6. Signal Detection Theory 1

7. SDT 2- So What? Notes that for some problems, people are not not trying, the problem is hard Notes that people might not be different in ability but different in threshold Gives design advice –Make d’ larger –Measure d’ not threshold in users –Adjust payoffs if you care

8. Ch 4. Eyes

9. Ch 4. Popout Popout of char Word completion Sentence completion

10. Ch 4. Popout 2 Not really a joke, but you will always this read wrong.

11. Ch 4. Popout 2

12. Ch 4. Gestault

13. Ch 4. Implications Active vision –Bird is like fovea Not much buffering Blind spots

14. Chapter 4 Motivation (cont) Maslov’s hierarchy

15. Chapter 4 Motivation (cont) Extrinsic & Intrinsic motivation

16. Implications in Graphs: Make things complete, popout, etc. From reddit:

17. Ch. 5-Attention Types of attention –In IO, in central cognition –Limited –Interuptions –Implication for design: Help focus users’ attention

18. Use of Perception in Web Design