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|  |Brain structural MRI in pediatric Tourette syndrome \citep{TSANIC:VBM:London} |A large multisite study found TS children had greater gray matter volume in the posterior thalamus and hypothalamus-midbrain in addition to decreased white mater volume in the orbital prefrontal cortex and the anterior cingulate.|  |  |Electrophysiological similarities in Tourette |Tourette  syndrome and chronic tic disorder \citep{26531497} |Event-related potentials recordings, during a stimulus-response compatibility task, revealed increased parietal and central activation for both patient groups compared to the control group. The two patient groups were not different from one another.| |  |Event-related topography and the effect of comorbidities|P300 amplitude in the frontal region was reduced for TS patients with comorbid symptoms compared to control subjects while a medication-naive TS group with no comorbid conditions was similar to the control group.