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Updated: Mar 11, 2026
Preterm EEG: A Multimodal Neurophysiological Protocol
Published on: February 18, 2012
Sleep EEG maps the functional neuroanatomy of executive processes in adolescents born very preterm
Flavia M Wehrle1, Beatrice Latal2, Ruth L O'Gorman3
1Department of Neonatology, University Hospital Zurich, Zürich, Switzerland; Child Development Center, University Children's Hospital Zurich, Zürich, Switzerland.
Insights
Adolescents born very preterm show poorer executive function. Their brain activity during sleep, measured by slow wave activity (SWA), suggests increased effort in frontal regions, mapping higher cognitive demands.
Area of Science:
- Neuroscience
- Developmental Psychology
- Pediatrics
Background:
- Executive function deficits are common after very preterm birth, but underlying neural mechanisms remain unclear.
- Sleep slow wave activity (SWA) topography can map cognitive abilities by reflecting neuronal network usage.
Purpose of the Study:
- To investigate alterations in the functional neuroanatomy of executive processes in adolescents born very preterm using high-density electroencephalography (EEG) during sleep.
- To correlate sleep SWA distribution with executive function performance in very preterm-born adolescents.
Main Methods:
- High-density EEG (128 electrodes) was recorded during sleep in 38 very preterm-born adolescents and 43 term-born controls.
- Sleep slow wave activity (SWA) from the first hour of sleep was analyzed.
- Executive function abilities were assessed using a comprehensive task battery and quantified with a composite score.
Main Results:
- Adolescents born very preterm exhibited significantly poorer executive function compared to term-born peers, especially on high-demand tasks.
- Executive function scores positively correlated with frontal SWA and negatively with central SWA.
- A local increase in frontal sleep SWA was observed in very preterm-born adolescents compared to term-born peers, even after controlling for performance and age.
Conclusions:
- Sleep SWA topography reveals distinct patterns in very preterm-born adolescents, particularly over frontal brain regions associated with executive functions.
- The findings suggest that increased frontal sleep SWA in very preterm-born individuals may reflect heightened neural effort required for executive tasks.
Abstract:
Executive function deficits are among the most frequent sequela of very preterm birth but the underlying neuronal mechanisms are not fully understood. We used high-density electroencephalography (EEG) recordings during sleep to assess alterations in the functional neuroanatomy of executive processes in adolescents born very preterm. The topographical distribution of sleep slow wave activity (SWA; 1-4.5 Hz EEG power) has previously been used to map cognitive abilities and is known to reflect the intensity of the prior use of the respective neuronal networks. We assessed 38 adolescents born before 32 weeks of gestation [age at assessment: 12.9 (SD: 1.7), range: 10.6-16.7 years] and 43 term-born peers [13.1 (2.0), 10.0-16.9]. Executive function abilities were quantified with a composite score derived from a comprehensive task battery. All-night high-density EEG (128 electrodes) was recorded and SWA of the first hour of sleep was calculated. Abilities were significantly poorer in the very preterm compared to the term-group, particularly, if the tasks demands were high (p < .01). The score was positively correlated with sleep SWA in a cluster of 15 electrodes over frontal and negatively in a cluster of 14 electrodes over central brain regions after controlling for age at assessment and correcting for multiple comparisons. Within the frontal cluster, sleep SWA was higher in very preterm compared to term-born participants when controlling for executive function performance and age at assessment (p = .02). No difference in SWA between very preterm and term-born participants was found for the central cluster (p = .29). Our results demonstrate a local increase of sleep SWA over brain regions associated with executive processes in adolescents born very preterm compared to similarly performing term-born peers. Thus, sleep SWA seems to map the higher effort needed for executive function tasks in adolescents born very preterm.
