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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.|  |  |DTI and the corpus callosum \cite{26747579} |Axial diffusivity was reduced inthe corpus callosum in  treatment-naive boys with "pure TS" compared to controls. AD was negatively correlated with tic severity although this result did not reach significance after Bonferroni correction. |  |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 significantly different from one another.|  |