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Examining volumetric gradients based on the frustum surface ratio in the brain in autism spectrum disorder

Research output: Contribution to journalArticlepeer-review

MRC AIMS consortium

Original languageEnglish
Pages (from-to)953-966
Number of pages14
JournalHuman Brain Mapping
Issue number4
Published1 Mar 2021

Bibliographical note

Publisher Copyright: © 2020 The Authors. Human Brain Mapping published by Wiley Periodicals LLC. Copyright: This record is sourced from MEDLINE/PubMed, a database of the U.S. National Library of Medicine

King's Authors


Autism spectrum disorder (ASD) is a complex neurodevelopmental disorder that is accompanied by neurodevelopmental differences in regional cortical volume (CV), and a potential layer-specific pathology. Conventional measures of CV, however, do not indicate how volume is distributed across cortical layers. In a sample of 92 typically developing (TD) controls and 92 adult individuals with ASD (aged 18-52 years), we examined volumetric gradients by quantifying the degree to which CV is weighted from the pial to the white surface of the brain. Overall, the spatial distribution of Frustum Surface Ratio (FSR) followed the gyral and sulcal pattern of the cortex and approximated a bimodal Gaussian distribution caused by a linear mixture of vertices on gyri and sulci. Measures of FSR were highly correlated with vertex-wise estimates of mean curvature, sulcal depth, and pial surface area, although none of these features explained more than 76% variability in FSR on their own. Moreover, in ASD, we observed a pattern of predominant increases in the degree of FSR relative to TD controls, with an atypical neurodevelopmental trajectory. Our findings suggest a more outward-weighted gradient of CV in ASD, which may indicate a larger contribution of supragranular layers to regional differences in CV.

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