A system and method for preserving temporal and spatial resolution in
complex sounds for poor performing patients having high stimulation
thresholds is described. The system and method employs two or more
adjacent electrode contacts to deliver concurrent stimulation. This
concurrent delivery of stimuli creates a high current field intensity
that overlaps between individual current fields generated by the two or
more adjacent electrodes and which individual fields are summed to create
an overlapping field that has a higher current field intensity than a
single current emanating from an individual electrode. The use of this
method reduces or eliminates the need to increase either the stimulus
current amplitude or to increase the pulse width, both of which may cause
loss of system resolution, i.e., loss of fine structure information that
is used to resolve complex sounds such as music.