New answers tagged eeg
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It seems I misunderstood how the outputs may be viewed from an MEG.
Magnetoencephalography (MEG) is a non-invasive test, which:
measures the magnetic fields generated by electric currents in the brain. The magnetic field measurements are in the range of femto-tesla to pico-tesla. MEG provides a very accurate resolution of the timing of neuronal activity (...
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A voltage is by definition a potential difference between 2 electrodes.
Nonetheless, to record a signal on 1 electrode that is hardly affected by the other reference electrode a distant electrode can be used, referred to as monopolar recording. By contrast, when 2 electrodes are placed close together on the site of interest it is referred to as a bipolar ...
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EEG measures voltage. By definition, voltage is an electric potential difference. There is no meaning of an "absolute" voltage, it's always a difference.
Yes, people "attempt" to measure a voltage with only one contact all the time, it happens whenever there is a broken channel or a failure of a ground wire. The result is an amplification ...
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