EDITORIAL USE ONLY: Surgeon Michael Pringle holds the internal parts of a binaural cochlear implant device. The circular part sits under the skin against the skull with the shorter electrode array going into the cochlea on that side of the head. The longer array runs under the skin across the top of the skull to the cochlea in the other ear. External microphones and processors determine the stimulation to be applied to the internal arrays to give effective 'stereo' hearing. Photographed at Southampton General Hospital, UK.