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

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

Ch. 3 Fitts Law (reprise) Time to move = –Constant + rate * ID – 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

What we are examaning today

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

Signal Detection Theory 1

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

Ch 4. Eyes

Ch 4. Popout Popout of char Word completion Sentence completion

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

Ch 4. Popout 2

Ch 4. Gestault

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

Chapter 4 Motivation (cont) Maslov’s hierarchy

Chapter 4 Motivation (cont) Extrinsic & Intrinsic motivation

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

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

Use of Perception in Web Design