A method of atrial rotational activity pattern (RAP) source detection isprovided which includes detecting, via a plurality of sensors, electro-cardiogram(ECG) signals over time, each ECG signal detected via one of the plurality ofsensors and indicating electrical activity of a heart. The method alsoincludesdetermining, for each of the plurality of ECG signals, one or more localactivationtimes (LATs) each indicating a time of activation of a corresponding ECGsignal.The method further includes detecting whether one or more RAP source areas ofactivation in the heart is indicated based on the detected ECG signals and theoneor more local LATs. Mapping information of the detected RAP source areas ofactivation in the heart is also generated for providing one or more maps.
