Speed Accuracy Trade Off
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What is the speed accuracy trade off?
The more rapidly we move the more innaccurate we move
What is Fitts’ Law equation?
Movement time is plotted on a graph of = a + b [ log2 (2A/W)]
log2 (2A/W) = the index of difficulty
A = the distance from the targets
W = the width of each target
a = starting time (y-intercept)
b = how much slower it gets as difficulty increases (gradient of line)
![<p>Movement time is plotted on a graph of = a + b [ log2 (2A/W)]</p><ul><li><p>log2 (2A/W) = the index of difficulty</p></li><li><p>A = the distance from the targets</p></li><li><p>W = the width of each target</p></li><li><p>a = starting time (y-intercept)</p></li><li><p>b = how much slower it gets as difficulty increases (gradient of line)</p></li></ul><p></p>](https://knowt-user-attachments.s3.amazonaws.com/59e5c0da-39db-43c6-888f-5f2be6dc6289.png)
Why we are we less accurate when we speed up?
Motor system noise is the natural variability or ‘random error‘ that occurs in the process of producing movement
Fitts Law predicts that movements to small targets require more time because the effects of motor noise increase the chance of missing the target.
Therefore to be accurate we must slow down
Why do quicker movements have more noise?
Quicker needed movements require a larger force to move faster, which increases the signal dependent force
What loop control is used for rapid movements?
Open loop
What loop control is used for slow movements?
Closed loop
What did the badminton study on SATO show?
Players hit shuttlecock as fast as possible under two conditions: general direction (TB) or center target (CC).
Key finding: Elite players perform best at 80–99% of max speed to maintain high spatial accuracy