An electrophysiology apparatus (8) is used to measure electrical activity occurringin a heart (10) of a patient (11) and to visualize the electrical activity and/orinformation related to the electrical activity. A three dimensional map of theelectrical activity and/or the information related to the electrical activityis created. Colors, shades of colors, and/or grayscales are assigned to valuesof the parameters and colors corresponding to the parameters for the electrogramssampled by the electrodes (e.g., 12, 14, 16, 17, 18, 19, 22) are updated on the threedimensional model (62).