Giraud et al. (2001)

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Cross-Modal Plasticity Underpins Clinical Study Language Recovery after Cochlear Implantation

Basically, in this study the cochlear implants restored hearing to the deaf participants by stimulating the auditory nerve with about sixteen electrodes. Cochlear patients must work hard to hear, mainly because their sound signal is usually deteriorated. After the procedure the patients take a while to get accustomed to their new hearing devices. In the time after their implant, patients must rely on lipreading in order to understand what they are because their implant is unable to discriminate similar sounding words (i. e. duck/buck). Therefore, after a period of time visual cortex begins to activate when patients listen, even in purely auditory tasks (eyes closed). Ultimately, they become good at hearing speech and their visual cortex is activated with sound. Link to the actual article by Giraud et al. 

                Image:Implant_works.jpg
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