1. An electronic tissue stimulator system, comprising: at least three electrodes to be implanted adjacent tissue to be stimulated in a patient; transmitting means for transmitting programming data to define for each of said electrodes to a positive, negative or high impedance state; receiving means to be surgically implanted within said patient for receiving said programming data, for generating stimulation pulses and for delivering said stimulation pulses to said electrodes having positive and negative states as defined by said programming data; means for automatically measuring physical parameters; and means for modifying said programming data as a function of said sensed parameters.