Apparatus, including a mockup cavity, simulating anactual body cavity of a human subject, wherein wallsdefining the mockup cavity comprise a tissue equivalentmaterial (TEM). An array of electrodes are embedded inthe walls. The apparatus further includes a programmablesignal generator, connected to the electrodes, andconfigured to apply varying potentials to the array ofelectrodes so as to simulate electrophysiologicalpotentials occurring in the actual body cavity onsurfaces of the walls.
