Week 6

Question 1

Speed accuracy tradeoffs

Answer 1

-fast movements are less accurate
-accurate movements are slower

Question 2

Fitts law

Answer 2

-tap between 2 targets as fast as possible maintaining 95% accuracy
-time linearly increases with movement difficulty for closed loop tasks

Question 3

What does MT stand for

Answer 3

-movement time

Question 4

What does A stand for

Answer 4

-amplitude
-distance between targets

Question 5

What does W stand for

Answer 5

-width
-width of actual target

Question 6

What does ID stand for

Answer 6

-index of difficulty

Question 7

When ID increases what happens to MT

Answer 7

-increases

Question 8

What units are ID in

Answer 8

-bits

Question 9

What does fitts law hold for

Answer 9

-children
-lower limb movements
-under magnification
-imagined movements
-perceived movements

Question 10

Effective target width

Answer 10

-the effective target width shows how much of the target you actually end up touching

Question 11

Schmidts law

Answer 11

-effective target width increases as amplitude increases and as movement time decreases

Question 12

Fitts law violations

Answer 12

-we do not plan for the worst case scenario, we just adapt by the time its the last target

Question 13

Impulse variability theory

Answer 13

-as you produce more force, you will be more variable in producing this force
-movements should become more accurate when 65% or more force is required