Children With Bilateral Cerebral Palsy Exhibit Bimanual Asymmetric Motor Deficits and EEG Evidence of Dominant
Connor Phillips1, Julia Kline1, Christopher J Stanley1
1Rehabilitation Medicine Department, Neurorehabilitation and Biomechanics Research Section, Clinical Center, National Institutes of Health, Bethesda, MD, USA.
Insights
Children with bilateral cerebral palsy (CP) show impaired reaching and distinct brain activity patterns. Understanding these electroencephalography (EEG) differences is crucial for early intervention and improving motor function in CP.
Area of Science:
- Neuroscience
- Developmental Pediatrics
- Rehabilitation Medicine
Background:
- Reaching is a key motor skill often impacted in cerebral palsy (CP).
- Research on CP manual function primarily focuses on unilateral cases.
- This study investigates reaching in bilateral CP using electroencephalography (EEG).
Purpose of the Study:
- To quantify brain activation patterns during reaching in children with bilateral CP.
- To correlate these EEG patterns with bimanual motor deficits.
- To compare brain activity between children with bilateral CP and typically developing peers.
Main Methods:
- 15 children with bilateral CP and 13 typically developing (TD) children performed reaching tasks.
- Motion capture and EEG data were recorded during reaching and the Box and Blocks test.
- Independent component analysis and k-means clustering identified cortical sources; alpha and beta band event-related desynchronization (ERD) were analyzed.
Main Results:
- Children with CP exhibited slower reaches, lower Box and Blocks scores, and greater hand preference.
- Higher beta ERD (motor execution) was observed in the dominant sensorimotor cluster in CP.
- CP showed less lateralized (more bilateral) alpha responses compared to TD, with greater brain activation correlating with better function.
Conclusions:
- Bimanual motor deficits in bilateral CP are associated with specific EEG differences.
- These findings highlight the need for focused clinical and research attention on bilateral CP.
- Earlier intervention may enhance neural and functional recovery potential in this population.
Background:
Reaching is a fundamental motor skill often impaired in cerebral palsy (CP). Studies on manual function, intervention, and underlying brain mechanisms largely focus on unilateral CP. This first electroencephalography (EEG) evaluation of reaching exclusively in bilateral CP aims to quantify and relate brain activation patterns to bimanual deficits in this population.
Methods:
A total of 15 children with bilateral CP (13.4 ± 2.9 years) and 13 with typical development (TD: 14.3 ± 2.4 years) performed 45 reaches per hand while recording motion capture and EEG data. The Box and Blocks test was administered bilaterally. Cortical sources were identified using independent component analysis and clustered using k-means. Alpha (8-12 Hz) and beta (13-30 Hz) band event-related desynchronization (ERD) values were compared across groups and hands within clusters, between dominant and non-dominant sensorimotor clusters, and related to reach kinematics and the Box and Block test.
Results:
The group with CP demonstrated bimanual motor deficits with slower reaches, lower Box and Blocks scores, and stronger hand preference than in TD. Beta ERD, representing motor execution, was notably higher in the dominant sensorimotor cluster in CP compared to TD. Both groups demonstrated more contralateral than ipsilateral activity in both hands and clusters, with CP showing a less lateralized (more bilateral) alpha response. Higher brain activation was generally related to better function.
Conclusion:
Bimanual deficits in bilateral CP and related EEG differences warrant more clinical and research attention particularly earlier in life when greater potential for neural and functional recovery exists.
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