Online cathodal transcranial direct current stimulation to the right homologue of Broca's area improves speech fluency in people who stutter.

The results indicated that stuttering severity was ameliorated when overactivation in RB was reduced by tDCS. This observation further suggests that speech dysfluency in PWS may be caused either by functional alteration in RB or by abnormal activation in speech motor control areas that are connected with RB.