# Lab 3 - KIN 315 Motor Learning Fall 2009 Name Lab 3 Speed...

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KIN 315 Motor Learning Fall 2009 Name Lab 3 Speed and Accuracy Purpose : To examine the relation between the time to make rapid arm movements and the difficulty of the task. This relation is expressed formally as Fitts' Law, in which task difficulty is defined in terms of the distance to move and the accuracy demands at the movement. Fitts' Law has been shown to generalize to a variety of physical activity and ergonomic situations where speed and accuracy play important roles. Task and Equipment Needed The task is to tap repeatedly as fast as possible between two targets, trying to hit each target every time. Equipment: interval timers impulse counters styli tapping targets 3 cm and 8 cm in diameter, 22 cm and 36 cm apart Procedures The purpose of the lab is to assess how movement time (MT) is affected by the difficulty of tasks. Fitts defined task difficulty in terms of target size (W, which is the width of the target) and the distance to move (D, which is the distance between targets). He quantified task difficulty (which he called "index of difficulty," or ID) by using the following equation: ID = log 2 (2D/W) For this lab, three combinations of task difficulty will be used. The easiest task has D = 36 cm

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