Children with Tourette’s show superior grammatical ability

From the British Psychological Society Research Digest:

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. . . .

The children with Tourette’s responded more quickly than the controls on those aspects of the tasks that were considered to depend on procedural memory – such as when producing past tenses of regular verbs and naming objects that can be manipulated, but they responded with similar speed to the controls when performance depended on declarative memory – such as when giving the past tense of irregular verbs or naming non-manipulable objects.

Procedural memory is rooted in the frontal/basal ganglia circuits of the brain and these areas are known to be structurally abnormal in people with Tourette’s. The researchers said it was likely this association explained the superior performance of the children with Tourette’s.

Past studies involving children and adults with Tourette’s have tended to focus on their involuntary verbal tics, rather than investigating their actual language abilities. . . . The new findings follow a study published last year that showed people with Tourette’s have enhanced cognitive control relative to healthy participants, as shown by their ability to switch task sets without the usual reaction time cost.

This makes sense to me.

1 thought on “Children with Tourette’s show superior grammatical ability

  1. This reminds me of the work by Cochran and Harpending, Natural History of Ashkenazi Intelligence: they noticed that several mutations are overrepresented in groups with higher IQ. They list Gaucher, Tay-Sachs, Niemann-Pick and Mucolipidosis IV, but perhaps Tourette's is another example of this same phenomenon. The fundamental idea is that many beneficial mutations also have negative side effects.

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