Correlations with Clinical Score.

Correlations (r) between motor evoked potential (MEP) changes caused by paired associative stimulation (PAS)/resting motor threshold and symptom severity as measured by sub-scales of the Yale Global Tic Severity Scale (YGTSS), the Diagnostic Confidence Index (DCI) (n = 14) and the Premonitory Urge for Tics Scale (n = 12) in Gilles de la Tourette syndrome (GTS) patients. Significance levels: *p<.05, **p<.01.