Children with Tourette’s syndrome, the motor disorder characterised by involuntary tics, are more skilled than healthy control children at processing certain forms of grammar. That’s according to Matthew Walenski at the Brain and Behaviour Lab at Georgetown University and colleagues, writing in Neuropsychologia.
https://digest.bps.org.uk/2007/09/03/children-with-tourettes-show-superior-grammatical-ability/