Kinesiology 3457A/B Lecture Notes - Lecture 4: Binary Logarithm, Usability, Observer-Expectancy Effect

• School: Western University
• Department: Kinesiology
• Course: Kinesiology 3457A/B
• Professor: Anita Christie

Document Summary

Fitts" law: equation that describes the speed-accuracy trade-off (ie. how long does it take to move the nger form the home button to the maps app) Hick"s law: more choices= longer it takes to make a decision from options (ie. how long does it take you to nd the maps app) The difference: fitt"s you know the location of what you are looking for and for hick"s you have to nd what you are looking for. How long it takes to accurately move to a target vs. how long it takes to nd a target. These laws can work independently of one another, but we often use both of them simultaneously we typically design devices with these laws in mind. When trying to nd out how changing the size and/or location of something effects movement time, nd out distance and width to calculate the index of dif culty (log2 2d/