# The main purpose of this lab is to demonstrate Fitts’ Law and its applications in motor control and movement execution.

The main purpose of this lab is to demonstrate Fitts’ Law and its applications in motor control and movement execution.

Introduction

Knowledge about the laws of movement control is essential for understanding motor learning principles. One of the most important laws in motor control is the speed-accuracy trade-off, also known as the Fitts’ Law. This principle simply refers to the fact that when movements are produced at faster speeds they tend to become less accurate. In other words, more accuracy is achieved at the expense of speed. This principle can be expressed in a mathematical formula:

MT = a + b log2(2D/W)

According to the formula, MT (movement time) is determined mainly by two factors, D (distance between the target and starting point) and W (width of the target). Fitts (1954) defined the term log2(2D/W) as the index of difficulty (ID). The ID can be used to quantify the level of difficulty for aiming movements.