In general, the invention is directed to techniques for shifting between
two electrode combinations. An amplitude of a first electrode combination
is incrementally decreased while an amplitude of a second, or subsequent,
electrode combination is concurrently incrementally increased. The
stimulation pulses of the first and second electrode combinations are
delivered to the patient interleaved in time. In this manner, the
invention provides for a smooth, gradual shift from a first electrode
combination to a second electrode combination, thereby allowing the
patient to maintain a continual perception of stimulation. The shifting
techniques described herein may be used during programming to shift
between different electrode combinations to find the most efficacious
electrode combination. Additionally, the techniques may be used for
shifting between different electrode combinations associated with
different stimulation programs or program sets.