The article summarized below reports on the cases of children with JHD who became symptomatic before age 10. Their CAG counts ranged between 93 and 120. In all three cases, language delay preceded speech impairment and motor dysfunction. None of the three were able to speak in two or three word phrases until after age three but weren't diagnosed until motor abnormalities became evident. The families felt that their children had benefited from diagnosis and the subsequent individualized education plans developed for them; all experienced significant improvement in speech.
The authors point out that clinical diagnosis of Huntington's Disease is generally done when motor symptoms appear. However with JHD, just as with adult HD, other symptoms may present first.