Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/93026
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Type: Journal article
Title: Cognitive abilities in preterm and term-born adolescents
Author: Schneider, L.A.
Burns, N.R.
Giles, L.C.
Higgins, R.D.
Nettelbeck, T.J.
Ridding, M.C.
Pitcher, J.B.
Citation: Journal of Pediatrics, 2014; 165(1):170-177
Publisher: Elsevier
Issue Date: 2014
ISSN: 0022-3476
1097-6833
Statement of
Responsibility: 
Luke A. Schneider, Nicholas R. Burns, Lynne C. Giles, Ryan D. Higgins, Theodore J. Nettelbeck, Michael C. Ridding, and Julia B. Pitcher
Abstract: Objective To investigate the influence of a range of prenatal and postnatal factors on cognitive development in preterm and term-born adolescents. Study design Woodcock-Johnson III Tests of Cognitive Abilities were used to assess general intellectual ability and 6 broad cognitive abilities in 145 young adolescents aged approximately 12.5 years and born 25-41 weeks gestational age (GA). To study potential links between neurophysiologic and cognitive outcomes, corticomotor excitability was measured using transcranial magnetic stimulation and surface electromyography. The influence of various prenatal and postnatal factors on cognitive development was investigated using relative importance regression modeling. Results Adolescents with greater GA tended to have better cognitive abilities (particularly general intellectual abil- ity, working memory, and cognitive efficiency) and higher corticomotor excitability. Corticomotor excitability ex- plained a higher proportion of the variance in cognitive outcome than GA. But the strongest predictors of cognitive outcome were combinations of prenatal and postnatal factors, particularly degree of social disadvantage at the time of birth, birthweight percentile, and height at assessment.Conclusions In otherwise neurologically healthy adolescents, GA accounts for little interindividual variability in cognitive abilities. The association between corticomotor excitability and cognitive performance suggests that reduced connectivity, potentially associated with brain microstructural abnormalities, may contribute to cognitive deficits in preterm children. It remains to be determined if the effects of low GA on cognitive outcomes attenuate over childhood in favor of a concomitant increase in the relative importance of heritability, or alternatively, if cognitive development is more heavily influenced by the quality of the postnatal environment. (J Pediatr 2014;165:170-7) .
Keywords: BW% Birthweight percentile; GA Gestational age; GIA General intellectual ability; IRSD Index of relative socioeconomic disadvantage; M1 Motor cortex; MRI Magnetic resonance imaging; rMT Resting motor threshold; SES Socioeconomic status; TMS Transcranial magnetic stimulation; WCH Women’s and Children’s Hospital
Rights: © 2014 Elsevier Inc. All rights reserved
RMID: 0030011414
DOI: 10.1016/j.jpeds.2014.03.030
Grant ID: http://purl.org/au-research/grants/nhmrc/565344
Appears in Collections:Paediatrics publications

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