Impulsivity is often described as the engine of Tourette’s, running without anyone pressing the accelerator. It is not a lack of thought or a difficult personality, but a feature of the brain’s operating system. In people with Tourette’s, the time between impulse and action is drastically reduced. It is as if the brain skips the review phase and goes straight to execution, leaving little room to assess the consequences. Neurologically, this phenomenon reflects a difficulty in response inhibition processes. The brain receives thousands of stimuli per second and must decide which to discard and which to act upon. In Tourette’s,…

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