SIE 515 Human Memory Class 3

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

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

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

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

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

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

Random number sequence 38265391764

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Chunk number sequence 1 207 581 2187

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YDO GLIK ESBO NESM

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Y DO G LIK ES BO NES M

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

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

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? Please post to blog by 11:59PM on 1-27-16. https://www.cs.umd.edu/users/ben/photos.html 24