Establish the Role of Premotor and Motor Cortices in tDCS-facilitated Speech Motor Learning

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Groups of unimpaired participants will all receive speech motor training of nonwords, and six tDCS conditions will be compared: anodal tDCS over speech motor regions; cathodal tDCS over speech motor regions; anodal tDCS over left frontal regions; cathodal tDCS over left frontal regions; cathodal stimulation over non-speech motor regions (anodal already collected);and sham tDCS (no stimulation). This will address a basic science question about whether the mechanism underlying speech motor learning requires premotor and motor cortical regions to be stimulated, which has implications for treatment of acquired speech impairment. The primary outcome measure will be the difference in production accuracy and changes in motor acuity (measured with duration) of novel consonant cluster production.