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Measuring voltage at a synapse gives you a measure of the input to a cell. Measuring voltage at the axon hillock (for a typical neuron, practically the soma can substitute as well) gives you a measure of the output of a cell: how near it is to threshold and/or if it has reached threshold and produced a spike. Measuring voltage at intermediate sites in the ...


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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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