Copyright © American Speech-Language-Hearing Association From: Relief of Acquired Stuttering Associated With Parkinson’s Disease by Unilateral Left Subthalamic Brain Stimulation J Speech Lang Hear Res. 2009;52(6):1652-1657. doi:10.1044/1092-4388(2009/08-0089) Legend: A: Blinded evaluations of the effects of unilateral left subthalamic nucleus deep-brain stimulation (STN DBS) on stuttering associated with Parkinson’s disease show significant improvement in the percentage of syllables stuttered combining results from three separate speech evaluations. B: Although the percentage of syllables stuttered improved on dopaminergic medications, the effect of unilateral STN DBS was relatively independent of medication. *p < .00001, χ2 test comparing DBS-off and DBS-on conditions. Date of download: 11/10/2017 Copyright © American Speech-Language-Hearing Association