1gbqlxg0h8ger3
Joined: Feb 15, 2008
Posts: 1
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 Posted: Feb 15, 2008 6:07 AM Post subject: A novice question about EEG signal amplitude |
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I have a novice question.
Amplitude of neural pulse is about 0.1V, head impedance(via 1cm diameter electrodes)
values ranging 300-500 Ohm, scalp-electrode impedance is about 10 KOhm, input-impedance
of differential amplifier is aoubt 100 MOhm. Then why the signal amplitude recorded by
EEG is only tens of micro volts?
If one measures the voltage between two hands by digital multimeter(10 MOhm
input-impedance) via 1cm diameter electrodes, how much would be the normal results(DC
mode and AC mode)?
Everybody knows EEGs work under 100Hz. But what about the influence of Ranvier's node? |
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