# Lab 1 fitts’ law and motor control

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.

Paper target sheets and pencils will be used. The targets drawn on paper vary in sizes with different distances between the targets creating 9 conditions (see the following table).

Procedures

All students will be tested as subjects. You will work in pairs or threesomes. Before testing starts, make sure that the paper sheets are mounted on the table with scotch tape or held down with the help of another person. The order in which the trials are completed should be randomized. Every person completes 9 trials that differ from one another either in distance or target size. For each trial, the subject completes tapping movements back and forth consecutively for 10 seconds. The requirement for the tapping movements is that no target should be missed even though fastest speed possible is produced. The subject should hold the pencil high enough so that the pencil will not scratch the surface of the sheet and the elbow will not touch the table. Record the number of taps (T) by counting the number of dots on the targets.

Individual Data Sheet

Trial   #

Distance   (D)

Width   (W)

# of   Taps

MT

Log2(2D/W)

(Index of Difficulty)

1

8   cm

1   cm

22

0.455

4

2

8   cm

2   cm

30

0.333

3

3

8   cm

4   cm

43

0.233

2

4

4   cm

1   cm

27

0.370

3

5

4   cm

2   cm

39

0.256

2

6

4   cm

4   cm

45

0.222

1

7

2   cm

1   cm

32

0.313

2

8

2   cm

2   cm

44

0.227

1

9

2   cm

4   cm

57

0.175

0

Assignment

Data Analysis

1. Calculate movement time (MT) for each trial by dividing 10 sec by the number of taps.

2. Calculate the index of difficulty (ID) by using the following table

2D/W

1

2

4

8

16

32

64

128

ID   (index of difficulty)

0

1

2

3

4

5

6

7

3. Draw a scatter gram (using Microsoft Excel) that displays the relationship between the level of difficulty (ID) and movement speed (MT). Put the MT on the vertical axis and ID on the horizontal axis.

Define the term “ID (index of difficulty.” What factors      contribute to the level of difficulty in a task?

· The two factors contribute to the level difficulty in a task are quotient of target width and distance.

1. Examine your data and determine what effect distance between      the targets has generated on movement time.What effect does the size of      the target have on movement time? Looking at your graph, determine if the      relationship between MT and ID is direct, indirect, or non-existent. Indicate      whether your findings support the Fitts’ Law.

·

1. Based on the      speed-accuracy trade-off assumptions of Fitts’ law, what do you think      would happen in baseball delivery when pitching if the strike zone was      made bigger?  What if the strike zone decreased? Explain your answer      using Fitts’ law related to size of the target.
Pages (550 words)
Approximate price: -

Why Work with Us

Top Quality and Well-Researched Papers

We always make sure that writers follow all your instructions precisely. You can choose your academic level: high school, college/university or professional, and we will assign a writer who has a respective degree.

We have a team of professional writers with experience in academic and business writing. Many are native speakers and able to perform any task for which you need help.

Free Unlimited Revisions

If you think we missed something, send your order for a free revision. You have 10 days to submit the order for review after you have received the final document. You can do this yourself after logging into your personal account or by contacting our support.

Prompt Delivery and 100% Money-Back-Guarantee

All papers are always delivered on time. In case we need more time to master your paper, we may contact you regarding the deadline extension. In case you cannot provide us with more time, a 100% refund is guaranteed.

Original & Confidential

We use several writing tools checks to ensure that all documents you receive are free from plagiarism. Our editors carefully review all quotations in the text. We also promise maximum confidentiality in all of our services.

Our support agents are available 24 hours a day 7 days a week and committed to providing you with the best customer experience. Get in touch whenever you need any assistance.

Try it now!

## Calculate the price of your order

Total price:
\$0.00

How it works?

Fill in the order form and provide all details of your assignment.

Proceed with the payment

Choose the payment system that suits you most.

Our Services

No need to work on your paper at night. Sleep tight, we will cover your back. We offer all kinds of writing services.

## Essay Writing Service

No matter what kind of academic paper you need and how urgent you need it, you are welcome to choose your academic level and the type of your paper at an affordable price. We take care of all your paper needs and give a 24/7 customer care support system.