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Human Computer Int

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Submitted By donian
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Faculty of Media Engineering and Technology
CSEN909: Human Computer Interaction

Winter 2015
Dr. Wael Abo El Saadat

Eng. Mennat-Allah Essam

MET Tutorial Notes 7
Conent:
1- Huam Performance
a. Processing Theories
b. Cognition
c. HCI Laws

Processing Theories
Human Performance= Perceptual System + Cognitive System + Motor System
100ms +

70ms

+ 70ms

Processing Theories
Top-Down
(constructivist)

Bottom-Up
(ecological)

Grouping Laws

Law of
Closure

Law of Proximity
Law of Continuity
Law of Prgananz
Law of Similarity

Gestalt
Theory
Law of
Figure/Ground

Cognition

Cognition
Cognitive
Processor

Memory
Long Term
Memory
-Facts
-High capacity
-Low Decay
-Access
Time=100ms

Working
Memory
-Intermediate
-7±2 chunks
-High Decay
-passes to LTM

Encodingspecificty
Principle
(activate association) Discrimination
Principle
-Too few: can't recall -Too many: false
Memory

HCI Laws
1- Hick’s Law
The more options given to an individual, the longer their decision time will be.

T=blog2(n+1)
Time to decide

Eg: Number of options in menus
2- Power Law of Practice

constant

Number of choices

Uncertainity
Increases
Decision time

The more an individual practices a motor skill, the faster they become at it
Constant between 0.4-0.5

Tn=T1n-a+c
Time to perform function nth time

Eg: learning typing, using a mouse

Time to perform

Constant
Number of repetitions

Function 1st time

Question:
Which activities of the following can have the “Power law of practice" applied to them?
 Reading a book
 Sewing
 Deducing a mathematical equation
 Playing tennis
Solution:
Sewing, Playing tennis
The law applies only to the time taken to perform the skilled behavior (sensory and motor).
However, it does not apply to the knowledge acquisition or improving the quality of

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