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Neuroimage Clin. 2016 Jan 21;11:149-57. doi: 10.1016/j.nicl.2016.01.016. eCollection 2016.

Language at rest: A longitudinal study of intrinsic functional connectivity in preterm children.

Author information

1
Pediatrics, Yale School of Medicine, New Haven, CT, USA.
2
Radiology and Biomedical Imaging, Yale School of Medicine, New Haven, CT, USA.
3
Pediatrics, Warren Alpert Medical School, Brown University, Providence, RI, USA.
4
Yale Center for Analytical Science, Yale School of Public Health, New Haven, CT, USA.
5
Pediatrics, Yale School of Medicine, New Haven, CT, USA; Neurology, Yale School of Medicine, New Haven, CT, USA.

Abstract

BACKGROUND:

Preterm (PT) children show early cognitive and language deficits and display altered cortical connectivity for language compared to term (T) children. Developmentally, functional connectivity networks become more segregated and integrated, through the weakening of short-range and strengthening of long-range connections.

METHODS:

Longitudinal intrinsic connectivity distribution (ICD) values were assessed in PT (n = 13) compared to T children (n = 12) at ages 8 vs. 16 using a Linear Mixed Effects model. Connectivity values in regions generated by the group × age interaction analysis were then correlated to scores on full IQ (FSIQ), verbal IQ (VIQ), verbal comprehension IQ (VCIQ), performance IQ (PIQ), Peabody picture vocabulary test-revised (PPVT-R), and Rapid Naming Composite (RDRL_Cmp).

RESULTS:

Nine regions were generated by the group × age interaction analysis. PT connectivity significantly increased over time in all but two regions, and they ultimately displayed greater relative connectivity at age 16 than Ts in all areas except the left occipito-temporal cortex (OTC). PTs underwent significant connectivity reductions in the left OTC, which corresponded with worse performance on FSIQ, VIQ, and PIQ. These findings differed from Ts, who did not undergo any significant changes in connectivity over time.

CONCLUSIONS:

These findings suggest that the developmental alterations in connectivity in PT children at adolescence are both pervasive and widespread. The persistent and worsening cognitive and language deficits noted in the PT subjects may be attributed to the loss of connections in the left OTC.

KEYWORDS:

BA, Brodmann area; Development; FSIQ, full scale IQ; Functional connectivity; Intrinsic connectivity distribution; Language; OTC, occipito-temporal cortex; PIQ, performance IQ; PPVT, Peabody picture vocabulary test; PT, preterm; Preterm; RDRL_Cmp, Rapid Naming Composite; ROI, region of interest; RSC, resting state connectivity; RSN, resting state network; Resting state; T, term; VCIQ, verbal comprehension IQ; VIQ, verbal IQ; VWFA, visual word form area

PMID:
26937383
PMCID:
PMC4753807
DOI:
10.1016/j.nicl.2016.01.016
[Indexed for MEDLINE]
Free PMC Article
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