Article: article from journal or magazin.
Cross-modal plasticity underpins language recovery after cochlear implantation.
Publication types: Journal Article ; Research Support, Non-U.S. Gov't Publication Status: ppublish
Postlingually deaf subjects learn the meaning of sounds after cochlear implantation by forming new associations between sounds and their sources. Implants generate coarse frequency responses, preventing place-coding fine enough to discriminate sounds with similar temporal characteristics, e.g., buck/duck. This limitation imposes a dependency on visual cues, e.g., lipreading. We hypothesized that cross-modal facilitation results from engagement of the visual cortex by purely auditory tasks. In four functional neuroimaging experiments, we show recruitment of early visual cortex (V1/V2) when cochlear implant users listen to sounds with eyes closed. Activity in visual cortex evolved in a stimulus-specific manner as a function of time from implantation reflecting experience-dependent adaptations in the postimplant phase.
Acoustic Stimulation, Auditory Cortex/physiology, Cochlear Implantation/rehabilitation, Deafness/physiopathology, Deafness/rehabilitation, Humans, Language, Lipreading, Male, Neuronal Plasticity/physiology, Speech Perception/physiology, Tomography, Emission-Computed, Visual Cortex/physiology
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