Brief report: the impact of subcortical band heterotopia and associated complications on the neuropsychological functioning of a 13-year-old child.

Doctors looked at one 13-year-old girl who has autism and a rare brain fold called subcortical band heterotopia.

They gave her a full neuropsych test battery to see how the brain fold changed her thinking and moving skills.

The teen showed big problems with balance and rapid alternating movements, like fast palm-flips.

Her motor scores were far below her IQ, and the worse her balance, the more her social withdrawal showed.

Plant et al. (2007) ran the same tests on a whole group of HFA/AS teens the same year and got the same result: large balance and diadochokinesis deficits that tracked with social symptoms. The match is so close it acts like a direct replication.

Martín-Díaz et al. (2024) widened the age range and still found the same large motor gaps, showing the problem starts in childhood and stays through the teen years.

Boudreau et al. (2015) adds a twist: balance in ASD drops further when tasks get harder, but the deficit is no longer tied to autism severity once you factor in age. This seems to clash with Fyfe et al. (2007) and Plant et al. (2007), who found the motor-social link. The difference is that A et al. statistically controlled for age; when age is held constant, the link disappears, suggesting the social tie may be developmentally driven.

If you work with teens on the spectrum, expect balance and rapid-move troubles even when IQ is average. Quick screens like heel-to-toe walk or palm-tapping can flag kids who may pull back from PE or social events. Add motor goals to the behavior plan and pair social outings with movement breaks so fatigue does not nudge them into withdrawal.