Motor Control Lecture 9_Student Version.pptx

Motor Control Lecture 9_Student Version.pptx - Motor...

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Motor Control and Learning Lecture 9 : Speed and Accuracy Jessica Rodriguez, MS
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The Tradeof Speed-Accuracy tradeof An emphasis on speed of movement will reduce accuracy An emphasis on accuracy will reduce speed of movement Fitts’ Law Paul Fitts (1954) Predicts the movement time for a situation that requires speed and accuracy Primarily applied to pointing movenments
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Fitts’ Law Based upon the following situation: Subject must move back and forth between targets Movement time depends on distance between targets, and the size of the targets MT = a + b(log 2 (2D/W)) MT: movement time D: distance to move W: width/size of target a and b are constants Multiple versions of this equation
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Fitts’ Law Index of difficulty log2(2D/W) Quantitative measure of difficulty of movement (based on speed/accuracy requirements, given in bits) Making the task more difficult increases the amount of information to be processed Human processing speed is limited
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Fitts’ Law We can also perform the opposite and should see the same result: Ask a person to move in time with a metronome Measure spatial error of pointing performance Will see a tradeof in spatial error with increasing metronome speed.
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Fitts’ Law Fitts’ Law is l ogarithmic , similar to Hick’s Law Movement time increases a constant amount every time the Index of Difficulty increases by one bit 0 1 2 3 4 5 Index of Difficulty (bits) Movement Time
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Fitts’ Law What does the equation mean? a: y-intercept MT when ID is zero What is a zero difficulty task? D and W overlap – no distance between targets Essentially tapping up and down b: slope of line Increase in MT per ID bit Slope can be reduced with practice Older people tend to have greater slopes
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Fitts’ Law Relationship holds for several other conditions: Movements at finger, wrist, arm, and foot Slope is diferent for each Movements underwater Microscopic movements s urgeons/dentists
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Speed Accuracy Tradeof Alternate tapping is not a very useful function
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