Electroencephalographs - Basics
| Abbreviation / other names What
does |
EEG
Electro = electrical activity |
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| What does it do? |
It records the electrical activity in the brain. |
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| Physiology |
The cells in the brain transmit messages to each other by
tiny electrical currents. |
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| How it works |
These electrical potentials in the brain can be measured on
the surface of the head as tiny voltages. EEG electrodes made
of gold, silver or platinum are placed on the head. Electrode
gel is used between the electrode and the skin to transmit the
signal from the skin to the electrode.
The EEG will display the signal on the screen as a series of many lines representing activity in different areas of the brain. The EEG may also filter the signals into different types such as a, b, d etc. |
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| Units of measurement |
Amplitude is measured in mV Frequency is measured in Hz |
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| Typical values |
The signals will be analysed by a Neurologist. They look for
bursts of activity, patterns, lack of signals. There is no simple typical value. |
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| Picture of equipment | ||||
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