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“Dexter has a rarer form of Tourette’s called coprolalia,” Andrea explained.

Changes to these very same brain structures—the basal ganglia in particular—are observed in people with coprolalia, the uncontrollable use of taboo language often observed in Tourette Syndrome.

The most familiar and caricatured form of Tourette's is called coprolalia, in which the sufferer uses sometimes inappropriate language in bursts.