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Figure 3: Common average reference derivation: Highlights the importance of removing electrodes showing large signals from the average, in this case artifacts at C3 and C4. a) all channels show a signal of equal amplitude but of opposite polarity to the artifact signal. b) the signals persist when the sensitivity of C3 and C4 are reduced. c) once C3 and C4 electrodes are removed from the average, signals are no more seen in the other channels

Figure 3: Common average reference derivation: Highlights the importance of removing electrodes showing large signals from the average, in this case artifacts at C3 and C4. a) all channels show a signal of equal amplitude but of opposite polarity to the artifact signal. b) the signals persist when the sensitivity of C3 and C4 are reduced. c) once C3 and C4 electrodes are removed from the average, signals are no more seen in the other channels