Kinesiology 1080A/B Lecture Notes - Lecture 22: Paul Fitts, Needle Time, Binary Logarithm

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As movement accuracy increases, so does movement time. The big red button has a lot of room for error, therefore, our movement time will be fast: big button = allows you to move very fast to use it = less accuracy, shorter mt. There is a trade-off between how fast you can do something and how accurately you can do it. If you thread a needle, there is a lot of accuracy so the movement time is longer: tiny thread, tiny needle = time it takes to perform the task is going to be longer, longer. Wanted to see how we control goal directed movement. Initial-adjustment phase: propel the limb towards the target; primary agonist burst: current-control: using feedback, vision, proprioception to make sure an accurate movement is being made (cid:894)(cid:858)ho(cid:373)i(cid:374)g-i(cid:374)(cid:859) o(cid:374) the ta(cid:396)get(cid:895); includes antagonist and secondary agonist burst. All of these movements will be characterized by these two steps.

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