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WaveRider Operating Manual
19
Copyright 1997-2004 Jonathan Purcell
All Rights Reserved
Notes on Attaching Brainwave Electrodes
Attaching electrodes is more of an art than a science. It is not unusual for new users of
electrodes to have difficulty establishing a good brainwave electrode contact.
Electrode contact is extremely important. If electrodes do not make a good contact the
WaveRider will display random environmental noise rather than electrophysiological data. If
signals resembling brainwaves are displayed that appear identical whether or not the
electrodes are attached to the body, this indicates a poor connection.
A bad signal may be caused by a poor electrode connection and/or improper leadwire
placement. Electrode contact and leadwire placement are the most important aspects of noise
cancellation.
Sources of poor electrode contact include:
• Poorly attached electrodes,
• High skin impedance (due to skin that is oily, dirty or that has a lot of dead skin cells),
• Dirty or oxidized electrodes. (See below for information on cleaning electrodes).
Sources of improper leadwire placement include:
• Long lead wires,
• Lead wires being moved,
• Lead wires that pass by a source of electrical noise such as a computer monitor.
How to Determine Electrode Contact Quality
Whether a good signal has been achieved is determined by viewing the strip chart of the
channel to which the electrodes are attached. Poor electrode contact can result in the strip
chart displaying two different conditions. In the first condition the signal displays
insufficient amplitude ( i.e. vertical movement) under appropriate amplification (usually
range 7 for brainwaves). The signal should typically occupy at least 30% of the vertical
height of the strip chart window under appropriate amplification. In the second condition a
signal with substantial amplitude is displayed, but the signal displays environmental noise
rather than a biological signal. The environmental noise will usually be interference from 50
or 60 hertz power lines, but can also be caused other electronic devices such as computer
monitors.
- WaveRider 1
- Table of Contents 4
- HOW TO USE THIS MANUAL 7
- QUICK START 9
- WaveRider Operating Manual 10
- Changing Amplification 20
- Caring For Electrodes 21
- Electrode Placement 23
- KEY CONCEPTS 35
- CHANNELS 36
- USE CATEGORIES 36
- FILE CREATION 37
- WINDOWS 39
- Bar Graph Options 43
- Introduction 54
- ALPHA/THETA 89
- ASSESSMENT 113
- JUST FOR FUN 117
- PROGRAMMING WAVEWARE 120
- APPENDICES 155
- WHAT IS DDE AND THE DDE SDK? 155
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