M9 Speed-Accuracy Tradeoffs & SA Considerations

Question 1

The size of a target in aiming tasks (“W” in Fitts’ Law)

Answer 1

Width

Question 2

The distance between the two target centers in aiming tasks (“A” in Fitts’ Law)

Answer 2

Amplitude

Question 3

The theoretical “difficulty” of a movement in the Fitts tapping task, or ID = log2(2A/W)

Answer 3

Index of difficulty

Question 4

The tendency for accuracy to decrease as the movement speed or velocity of a movement increases and vice versa

Answer 4

Speed-accuracy trade-off

Question 5

In Fitts’ Law, the y-intercept represents the movement time when:

Answer 5

The index of difficulty (ID) is 0

Question 6

TF: According to Fitts’ Law, movement time (MT) decreases as movement amplitude decreases.

Answer 6

True

Question 7

Which of the following Fitts tapping task conditions would have the highest degree of difficulty?

Answer 7

Large movement amplitude and small target width

Question 8

Which of the following components of Fitts’ Law represents FASTER processing of more difficult movements?

Answer 8

Smaller (shallower) slope

Question 9

Which of the following components of Fitts’ Law represents SLOWER processing of more difficult movements?

Answer 9

Larger (steeper) slope

Question 10

Which of the following is/are true regarding Fitts’ Law?

Answer 10

-Closed loop movement
-Involves slower, feedback based movement
-Involves logarithmic relationship

Question 11

Which of the following is/are true regarding Schmidt’ Law?

Answer 11

-Open loop movement
-Determined by measuring effective target width (variability) of fast movements