1. SIE Human Memory
Class 3

2. TODAY’S SCHEDULE Sensory memory Working memory (WM) Memory and HCI
Buffers: Iconic, echoic, haptic
Working memory (WM)
WM function and methods for increasing capacity
Memory and HCI
Discussion of assignment

3. Human Memory and HCI Why is memory so important to design?
Memory is involved in all complex operations
Poor understanding of memory by designers
Supports recognition vs. recall
User’s don’t want to think or guess

4. Short-term memory or working memory
Human Memory
Sensory Memories
Attention
Short-term memory or working memory
Rehearsal
Long-term memory

5. Sensory Memory Buffer for incoming sensory stimuli
filters information or passes along to higher memory
similar to computer’s CPU cache memory
Major function = to perceive motion
Limited information capacity and duration
Three primary sensory buffers
Iconic, Echoic, and Haptic registers

6. Beyond the Buffer
Information flows from sensory buffer to working memory (WM)
Hand-off to WM based on two factors:
attention (top-down)
signal intensity (bottom-up)
Attentional modulation serves as filter:
directed from external or internal source
99% of incoming data is irrelevant

7. Working Memory Working memory = temporary information scratch pad
Recall and manipulation of information
Fast access, limited information capacity
Measuring WM capacity
7 +-2 rule (Miller, 1959)
higher capacity

8. Random number sequence

9. Blank

10. Chunk number sequence

11. Blank

12. YDO GLIK ESBO NESM

13. Blank

14. Y DO G
LIK ES BO
NES M

15. WM Continued Human nature = look for chunks and patterns
Increases capacity because creates meaning and associations
Memory closure
Free recall
Primacy and recency effect
WM vs. Computer RAM
HCI and WM 15

16. Memory Closure Instruction set 1 Before doing X and Y, you must do A
Do A, then do X and Y 15

17. For Next Class Assignment 3: Task 1: Read Shneiderman Ch. 6
Task 2: Based on the reading, write a couple of paragraphs about what you see as the dominant interaction style for interfaces of the future. What are the benefits of this style and what problems do you for see?
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