Extremely preterm children demonstrate hyperconnectivity during verb generation: A multimodal approach.

Neuroimage Clin

Hospital for Sick Children and University of Toronto are in Toronto, Canada; University of Toronto, Department of Physiology, Canada.

Published: July 2021

AI Article Synopsis

  • Children born extremely preterm (EPT, <28 weeks) may face developmental delays, especially in language, compared to term comparisons (TC) as assessed in a study involving 73 children aged 4 to 6 years.
  • While both groups showed similar brain activation patterns for language tasks via fMRI, the EPT group exhibited notable differences in functional connectivity assessed through MEG, particularly in the beta and gamma frequency bands.
  • Importantly, a hyperconnected subnetwork in the gamma band within the EPT group was positively correlated with their expressive language scores, suggesting that this hyperconnectivity could be a sign of resilience in their language development.

Article Abstract

Children born extremely preterm (EPT, <28 weeks gestation) are at risk for delays in development, including language. We use fMRI-constrained magnetoencephalography (MEG) during a verb generation task to assess the extent and functional connectivity (phase locking value, or PLV) of language networks in a large cohort of EPT children and their term comparisons (TC). 73 participants, aged 4 to 6 years, were enrolled (42 TC, 31 EPT). There were no significant group differences in age, sex, race, ethnicity, parental education, or family income. There were significant group differences in expressive language scores (p < 0.05). Language representation was not significantly different between groups on fMRI, with task-specific activation involving bilateral temporal and left inferior frontal cortex. There were group differences in functional connectivity seen in MEG. To identify a possible subnetwork contributing to focal spectral differences in connectivity, we ran Network Based Statistics analyses. For both beta (20-25 Hz) and gamma (61-70 Hz) bands, we observed a subnetwork showing hyperconnectivity in the EPT group (p < 0.05). Network strength was computed for the beta and gamma subnetworks and assessed for correlation with language performance. For the EPT group exclusively, strength of the subnetwork identified in the gamma frequency band was positively correlated with expressive language scores (r = 0.318, p < 0.05). Thus, hyperconnectivity is positively related to language for EPT children and might represent a marker for resiliency in this population.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7903004PMC
http://dx.doi.org/10.1016/j.nicl.2021.102589DOI Listing

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