Lecture 5 - Speed and Accuracy Principles Flashcards
Describe the Fitts’ Paradigm
Measuring movement time, focus on accuracy not speed
logarithmic relationship between movement time and distance of movement
Inverse relationship between difficulty of movement in speed
Shows how MT is sacrificed off under different values of ID to maintain accuracy
What does Fitts’ Law hold for?
Everything Different movements (larger limbs more sensitive to change in Index of Difficulty) underwater age lower body imagined movements
Describe the Linear Speed-Accuracy Trade off
single aiming movement
MT constrained
focus on speed rather than accuracy
Measuring standard deviation of movement amplitude (difference in end point)
As distance increases, errors increse
As MT decreases, errors increase
As MT decreases, velocity increases, and errors increase
What are the two ways to explain the linear versus logarithmic relationship?
Feedback Hypothesis
Linear is a preprogrammed task, so feedforward and open loop
Logarithmic is for continuous tasks, so closed loop and receives feedback for corrections
Movement-time Goal Hypothesis
Since the two paradigms are fundamentally different (be as fast as possible vs adopt non corrective strategy) so that’s why there is a different relationship
Temporal speed-accuracy trade-off
Anticipation (batter)
As MT decreases or velocity increases, accuracy improves
Discrete = produce specific MT
Smaller MT, larger velocity produces more consistency