1. A method for mapping a cardiac chamber, the method comprising: sensing activation signals of intrinsic physiological activity with a plurality of electrodes disposed in or near the cardiac chamber, the activation signals including a near-field activation signal component and a far-field activation signal component; isolating far-field events in the activation signals; generating a far-field activation template representative of the far-field activation signal component based on the isolated far-field events; and filtering the far-field activation template from the activation signals to identify the near-field activation signal components in the activation signals.