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Rapid On-Line Control to Reaching Is Preserved in Children With Congenital Spastic Hemiplegia: Evidence From
Christian Hyde1, Ian Fuelscher2, Peter G Enticott2
1Cognitive Neuroscience Unit, School of Psychology, Deakin University, Melbourne, Victoria, Australia c.hyde@deakin.edu.au.
Insights
Children with spastic hemiplegia demonstrate age-appropriate online reaching control, despite slower movements. Research should consider individual differences within this population.
Area of Science:
- Neuroscience
- Motor Control
- Developmental Pediatrics
Background:
- Spastic hemiplegia is a common childhood motor disorder.
- Existing research on motor control in spastic hemiplegia presents conflicting findings.
- Understanding online reaching adjustments is crucial for rehabilitation.
Purpose of the Study:
- To investigate the online control of reaching movements in children with congenital spastic hemiplegia.
- To clarify the impact of target perturbation on reaching accuracy and timing.
- To address the heterogeneity within the spastic hemiplegia population.
Main Methods:
- A double-step reaching task was administered to 12 children with spastic hemiplegia and 12 age-matched controls (11-17 years).
- Participants reached for a stationary target, with a minority of trials featuring unexpected lateral target displacement at movement onset (jump trials).
- Movement time and time to trajectory correction were analyzed.
Main Results:
- Children with spastic hemiplegia were generally slower than controls.
- Both groups demonstrated age-appropriate adjustments to target perturbations.
- No significant group differences were found in the time to correct reaching trajectories during jump trials.
Conclusions:
- Online reaching control appears to be age-appropriate at a group level in spastic hemiplegia.
- Significant heterogeneity exists within the spastic hemiplegia population.
- Future research must account for individual variability in motor cognition studies.
Abstract:
This study aimed to investigate the integrity of on-line control of reaching in congenital spastic hemiplegia in light of disparate evidence. Twelve children with and without spastic hemiplegia (11-17 years old) completed a double-step reaching task requiring them to reach and touch a target that remained stationary for most trials (viz nonjump trial) but unexpectedly displaced laterally at movement onset for a minority of trials (20%: known as jump trials). Although children with spastic hemiplegia were generally slower than age-matched controls, they could account for target perturbation at age-appropriate levels shown by a lack of interaction effect on movement time and nonsignificant group difference for time to reach trajectory correction on jump trials. Our data suggest that at a group level, on-line control of reaching may be age-appropriate in spastic hemiplegia. However, our data also highlight the need to experimentally acknowledge the considerable heterogeneity of the spastic hemiplegia population when investigating motor cognition.
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