After 50 Hz filtering, the EEG is forwarded to the second stage in order to remove ECG artifacts. Figures 5 and 6 show the same examples of EEG’s contaminated with ECG. It can be observed that QRS complexes are present in the EEG at the same instants that they appear in the ECG signal. The QRS amplitudes in the ECG are of the order of mV’s, but in the external EEG they were reduced. These artifacts in the EEG records could be clinically misleading.