ABSTRACT
The amplitude of a signal, such as the EEG, refers to the magnitude of the vertical extend describing the activity at a particular point in time, and it is measured in volts (V).1
Amplitude represents the voltage difference between a point in the signal and the baseline, which is a reference representing zero amplitude at the output of a differential amplifier. Recall that zero amplitude means that signals of the same amplitude are applied to both inputs. In the example of Figure 4.1, the arbitrary signal x(t) at time 1 msec has an amplitude of 3.2 V, while at time 6 msec its amplitude drops to about 1.9 V.
