Week 12 (MC) - Speed-Accuracy Trade Off

Question 1

Define the speed-accuracy trade off?

Answer 1

Motor tasks requiring force (speed) lead to trade-offs with accuracy.

Motor tasks requiring precision (accuracy) lead to trade-offs with force

Question 2

Describe Fitts law of speed-accruacy

Answer 2

Describes the relationship between the speed and accuracy of movement. It states that the time required to complete a task increases as the target size decreases or the distance to the target increases. Specifically, it predicts that:

Movement time is faster when the target is larger or the distance is shorter.
Movement time increases when the target is smaller or the distance is longer

Question 3

What is the intermittent feedback hypothesis?

Answer 3

You trade of speed to be accurate –> using the visual and sensory to guide the movement

• Explanation of movement adjustment based on observing changes in limb movement speeds
• Second / follow-up phases reflect corrective ‘closed loop’ sensory feedback

Question 4

What is the Impulse timing hypothesis?

Answer 4

Some movement tasks require speed where vision/feedback can’t be used
Pre-prepared CNS coordinated signalling required

Question 5

What is the Optimised Sub-movement Hypothesis?

Answer 5

Initial movement segment governed by principles of impulse variability primary open loop submovement
Total Movement Time = Trading-off speed for accuracy by optimizing duration of both initial impulse & sensory-driven correction
There is enough visual time to guide and make changes in a matter of time