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|  | The eyes have it \citep{26175694} | A measure of cognitive control explained half of the variance in tic severity. Blink rate—related to dopamine—was higher in children with TS than in controls. Pupil diameter—related to norepinephrine—was correlated with anxiety. |  |  }Postural Postural  stability \cite{25683311} | TS children with "pure TS" had significantly greater difficulty maintaining postural stability especially when they had to use only vestibular cues (rather than visual or somatosensory cues). |  Normal sensory thresholds \cite{26818628} | Thresholds for externally applied sensory stimuli were similar in adults with "pure" TS and controls suggesting that sensory abnormalities seen in TS are related to abnormalities in interoceptive awareness or central sensorimotor processing.