Accuracy deficits during robotic time-constrained reaching are related to altered prefrontal cortex activity in children with cerebral palsy.
Owais A Khan, Tarkeshwar Singh, Deborah A Barany and 1 others
PMID 39702205WHAT IT FOUND
Children with cerebral palsy had worse reaching accuracy, especially with their non-preferred arm.
Contrary to expectations, their prefrontal cortex activity dropped under time pressure. Higher prefrontal activity was linked to better accuracy in the CP group, suggesting this brain area plays a role in compensating for motor deficits.
Key findings
01Children with cerebral palsy showed significantly lower reaching accuracy than controls, with deficits twice as large when using the non-preferred arm.
02Under high time constraints, children with cerebral palsy exhibited lower prefrontal cortex activity compared to controls, contrary to the hypothesis of increased neural effort.
03Positive correlations between prefrontal cortex activity and reaching accuracy were observed in children with cerebral palsy across various conditions, but not consistently in controls.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
Read the rest of this summary
You get three full summaries a month, free, and we do not ask for a card. Search, the TL;DRs and your library stay unlimited either way.
What it does not show
The sample size was small (14 per group), limiting generalizability. The study only included children with mild motor impairments (GMFCS I-II, MACS I-II), so results may not apply to those with more severe disabilities. fNIRS only measures cortical activity and cannot assess subcortical structures like the basal ganglia or cerebellum. The dichotomous hit/miss accuracy measure may have lacked sensitivity to detect subtle kinematic differences. Eye movements and proprioceptive data were not collected, which could have explained some of the reaching deficits.
Declared interests
The authors declared no competing interests. The study was supported by the National Institutes of Health (NIH) and the Cerebral Palsy Foundation.
The easy way to misread this
Do not interpret the lower PFC activity in children with CP as a simple lack of effort or capacity. The authors suggest it may reflect a neural resource reallocation away from the prefrontal cortex to other brain areas to manage the motor demands, or a pathological deactivation. It is not a direct measure of cognitive ability.