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EEG spectral analysis and coherence in children with hemiparetic cerebral palsy
Wojciech Kułak1, Wojciech Sobaniec, Leszek Boćkowski
1Department of Pediatric Neurology and Rehabilitation, Medical University of Białystok, Białystok, Poland.
Insights
Children with hemiparetic cerebral palsy (HCP) show altered brainwave connectivity. Specifically, reduced interhemispheric coherence (ICoh) in alpha and beta bands suggests impaired communication between brain hemispheres in HCP patients.
Area of Science:
- Neuroscience
- Clinical Neurology
- Biomedical Engineering
Background:
- Hemiparetic cerebral palsy (HCP) presents with distinct forms, including arm-dominant and leg-dominant types, linked to specific lesion locations.
- Understanding the neurophysiological underpinnings of HCP is crucial for targeted interventions.
Purpose of the Study:
- To investigate EEG spectral power and coherence patterns in children with HCP.
- To compare interhemispheric coherence (ICoh) and intrahemispheric coherence (Hcoh) between children with HCP and healthy controls.
Main Methods:
- Clinical assessment and neuroimaging were performed on twelve children with HCP.
- Electroencephalography (EEG) data were analyzed for spectral power and coherence functions.
- 20 artifact-free EEG epochs (2s duration) per child were used for detailed spectral analysis.
Main Results:
- Significant differences in alpha, theta, delta, and beta rhythm distribution were observed between HCP and control groups.
- HCP patients exhibited significantly lower alpha band ICoh in temporal, parietal, and occipital regions.
- Increased theta and delta band ICoh, alongside decreased beta band ICoh, were noted in HCP children, with right hemisphere alpha band HCoh being higher.
Conclusions:
- Reduced alpha band ICoh indicates hypoconnectivity between brain hemispheres in HCP.
- HCoh asymmetry suggests diminished functional hemispheric differentiation, potentially impacting cognitive and motor development.
Background:
Hemiparetic cerebral palsy (HCP) is described as having two main forms: arm-dominant, associated with large cortical/subcortical lesions and leg-dominant, associated with central white matter lesions.
Material/Methods:
Twelve children with HCP underwent clinical assessment and imaging studies. For each child, 20 artifact-free EEG epochs, each of 2s duration, were selected for spectral analysis and coherence functions. The objective of this research was to estimate EEG spectral power, interhemispheric coherence (ICoh), and intrahemispheric (Hcoh) coherence in children with HCP as compared to healthy children.
Results:
Significant differences between the HCP and control children were detected in the distribution of alpha, theta, delta and beta rhythms over the left and right hemispheres. The ICoh values in the alpha band in the temporal, parietal and occipital regions were significantly lower in the HCP patients than in the controls. There was a significant ICoh increase in the HCP in the theta and delta band, involving frontal and temporal derivations. The significantly lower ICoh values in the HCP children in the beta band involved the frontal, central, parietal and occipital derivations. A higher HCoh value in the HCP children in the alpha band was detected at the right hemisphere.
Conclusions:
The lower ICoh at the temporal, parietal and occipital derivations in the alpha band implies hypoconnectivity between the right and left hemispheres. HCoh asymmetry, which implies relative hypoconnectivity within the left hemisphere as compared with the right, suggests that functional hemispheric differentiation may be diminished.
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