In addition investigators did not observe any recruitment of the visual cortices in our bilaterally implanted subjects. This finding was also present in Strelnikov's study. However previous work has suggested subjects with cochlear implants rely on visual clues to process speech as a result of the degraded signal provided by the implant. It is possible that because the subjects in this study and Strelnikov's study were experienced implant users and benefited from binaural auditory stimulation, they were not dependant on audio-visual integration to process speech.