L11A: Principles of Speed & Accuracy Flashcards
1
Q
A
B) Absolute Duration
2
Q
A
225 ms
3
Q
A
Longer Movement Time
4
Q
A
Longer Movement Time
5
Q
What is Fitts’ Law?
A
Fitts’ Law = Relationship between Movement Time
(MT), Amplitude (A) and Target Width (W)
6
Q
What is the Red a Measure of?
A
Index of Difficulty (ID)
According to this function,
as A increases, and/or W decreases, ID should increase
7
Q
What happens to MT when the Index of Difficulty Increases?
A
- Fitts’ law describes tradeoff between speed & accuracy.
- Increase in ID (accuracy constraints) → Longer MT
- Accuracy is manipulated and MT is measured
8
Q
How does Fitt’s Law relate to the
Equation of a Line?
A
9
Q
A
10
Q
A
11
Q
A
ID = 2
12
Q
You can have different amplitudes and widths, but same ID
A
