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|  |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.|  |  |Event-related topography and the effect of comorbidities\citep{http://dx.doi.org/10.1016/j.ijdevneu.2015.04.278}|P300 comorbidities\citep{Germain_2015}|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.| ### Clinical and neuropsychological studies