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Plasticity in sensory and motor systems shapes the control of adult speech| old_uid | 15950 |
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| title | Plasticity in sensory and motor systems shapes the control of adult speech |
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| start_date | 2015/07/09 |
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| schedule | 13h30-14h30 |
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| online | no |
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| summary | Speech is one of the most complicated human behaviours. In one second of fluid conversation we produce two to three words made up of ten to twelve phonemes, a task that involves the coordination of dozens of muscles. Even so, speech is remarkably accurate; the production of a thousand words typically yields only one or two mistakes. In partial explanation of this accuracy, recent work suggests that the nervous system carefully monitors sensory feedback during speech production to quickly correct errors. Here I investigate this idea in more detail by examining compensation patterns for real-time alterations of auditory feedback (the sound of the voice) during speech production. I show that alterations in the sound of the voice cause learned changes in production that rapidly counter the disturbance. The amount of "speech motor learning", in this case, depends on the perception of the altered word, and minutes of perceptual training drive predictable changes in speech perception and speech motor learning that last for days. Finally, I use transcranial direct current stimulation (tDCS) and the drift diffusion model to investigate the neural basis of speech perceptual learning. Contrary to recent neuroimaging studies, I provide direct interventional evidence that the cerebellum's role in speech is likely restricted to the motor domain. |
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| responsibles | Hueber |
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