CARDIAC FIELD ARTIFACT IN SLEEP EEG
Estimates of the cardiac field artifact were obtained for each EEG/EOG channel of all-night sleep EEG/ECG recordings by heartbeat-related averaging of the EEG. These estimates – so-called templates – can be used for minimization of the art ifact, e. g. by heartbeat-synchronized subtraction o f the template. The 3-dimensional nature of the cardiac field artifact is demonstrated by constructing vectorcardiograms from the templates and the corresponding electrode positions.