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Updated: Dec 24, 2025
Preterm EEG: A Multimodal Neurophysiological Protocol
Published on: February 18, 2012
Multimodal assessment shows misalignment of structural and functional thalamocortical connectivity in children and
Flavia M Wehrle1, Caroline Lustenberger2, Andreas Buchmann3
1University Children's Hospital Zurich, Child Development Center, Switzerland; University Children's Hospital Zurich, Department of Neonatology and Pediatric Intensive Care, Switzerland; University Children's Hospital Zurich, Children's Research Center, Switzerland.
Insights
Very preterm birth may disrupt the link between structural and functional brain connections, potentially explaining neurodevelopmental issues. This study found misalignments in thalamocortical connectivity in very preterm children.
Area of Science:
- Neuroscience
- Developmental Neuroscience
- Neuroimaging
Background:
- Thalamocortical connections are crucial for cognitive functions.
- Preterm birth is associated with altered brain development and neurodevelopmental deficits.
- The relationship between structural and functional changes in thalamocortical pathways following preterm birth remains unclear.
Purpose of the Study:
- To investigate the link between structural and functional thalamocortical connectivity in children and adolescents born very preterm.
- To determine if alterations in thalamocortical connectivity contribute to neurodevelopmental deficits in this population.
Main Methods:
- Utilized a multimodal approach combining diffusion tensor imaging (DTI) and high-density sleep electroencephalography (EEG).
- Quantified structural connectivity using thalamic segment volume and fractional anisotropy (FA) from DTI.
- Assessed functional connectivity through sleep spindle density and integrated spindle activity (ISA) from EEG.
Main Results:
- In term-born children, thalamic segment volume strongly correlated with sleep spindle activity.
- In very preterm children, thalamic segment volume was not associated with sleep spindles.
- In very preterm children, lower fractional anisotropy (FA) in thalamic segments negatively correlated with integrated spindle activity (ISA) in specific brain regions.
Conclusions:
- Identified a potential misalignment between structural and functional thalamocortical connectivity in individuals born very preterm.
- Findings suggest that disrupted thalamocortical connectivity may underlie neurodevelopmental sequelae of preterm birth.
- This study provides insights into the neuronal mechanisms associated with neurodevelopmental outcomes after preterm birth.
Abstract:
Thalamocortical connections are altered following very preterm birth but it is unknown whether structural and functional alterations are linked and how they contribute to neurodevelopmental deficits. We used a multimodal approach in 27 very preterm and 35 term-born children and adolescents aged 10-16 years: Structural thalamocortical connectivity was quantified with two measures derived from probabilistic tractography of diffusion tensor data, namely the volume of thalamic segments with cortical connections and mean fractional anisotropy (FA) within the respective segments. High-density sleep EEG was recorded and sleep spindles were identified at each electrode. Sleep spindle density and integrated spindle activity (ISA) were calculated to quantify functional thalamocortical connectivity. In term-born participants, the volume of the global thalamic segment with cortical connections was strongly related to sleep spindles across the entire head (mean r = .53 ± .10; range = 0.35 to 0.78). Regionally, the volume of the thalamic segment connecting to frontal brain regions correlated with sleep spindle density in two clusters of electrodes over fronto-temporal brain regions (.42 ± .06; 0.35 to 0.51 and 0.43 ± .08; 0.35 to 0.62) and the volume of the thalamic segment connecting to parietal brain regions correlated with sleep spindle density over parietal brain regions (mean r = .43 ± .07; 0.35 to 0.61). In very preterm participants, the volume of the thalamic segments was not associated with sleep spindles. In the very preterm group, mean FA within the global thalamic segment was negatively correlated with ISA over a cluster of frontal and temporo-occipital brain regions (mean r = -.53 ± .07; -.41 to -.72). No association between mean FA and ISA was found in the term-born group. With this multimodal study protocol, we identified a potential misalignment between structural and functional thalamocortical connectivity in children and adolescents born very preterm. Eventually, this may shed further light on the neuronal mechanisms underlying neurodevelopmental sequelae of preterm birth.
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