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Topic 3 & 4.docx

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York University
Kinesiology & Health Science
KINE 3020
Merv Mosher

Topic 3: 1. (a) Putting a key into a keyhole is an example of what type of skill? - Manual aiming skills (b) What does this skill require from the performer? - Involve hand movement to a target, require that the hand arrive at the target but at a speed that the performer determines 2. What is the speed-accuracy trade-off phenomenon? - The accuracy requirements of the movement will influence the movement speed so that an emphasis on accuracy will reduce speed, while an emphasis on speed will reduce accuracy ("trade off' speed for accuracy, and vice versa) 3. Give an example in sport when speed is more necessary than accuracy? - Running 4. Using a scientific perspective, what is a law? - A situation in which a result, or outcome, can be predicted when certain variables are involved 5. (a) What does Fitts’ law predict? - The movement time for a situation requiring both speed and accuracy in which a person must move to a target as quickly and accurately as possible (b) What 2 variables predict the performance outcome? - The distance to move and the target size 6. What is Fitts’ law in mathematical terms? - MT = a + b log 2(2D/ W) - Where: MT is movement time a and b are constants D is the distance moved W is the target width, or size 7. What part of Fitts’ law provides an index of difficulty (ID) for speed- accuracy skills? - The equation log 2(2D/ W) 8. True/False: The higher the ID, the less the difficult the task will be - False: the higher the ID is the more difficult the task will be (more difficult tasks will require more movement time) 9. (a) What are the two motor control processes that operate during the rapid limb movement to a target? - Open-loop control process - Closed-loop control process (b) What is the difference between the two? - Open-loop control processes: occurs initially and moves the limb into the vicinity of the target; where the initial movement’s speed, direction and accuracy are under CNS control - Closed-loop control: visual feedback about the limb's relative position to that target is used to guide the "homing in" phase of the limb to ensure its accurate landing on the target 10. True/False: The role played by vision in speed-accuracy skills depends on the phase of the limb movement - True 11. What are the 3 phases involved in performing the movements of a skill? - Movement preparation phase - Initial flight phase - Termination phase 12. Define prehension. - The action of reaching for and grasping an object that may be stationary or moving Topic 4: 1. Define reaction time (RT
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