Publication
Neuroanatomical heterogeneity and homogeneity in individuals at clinical high risk for psychosis
Publisher:
Springer Science and Business Media LLC
Date:
26-07-2022
DOI:
10.1038/S41398-022-02057-Y
Abstract: In iduals at Clinical High Risk for Psychosis (CHR-P) demonstrate heterogeneity in clinical profiles and outcome features. However, the extent of neuroanatomical heterogeneity in the CHR-P state is largely undetermined. We aimed to quantify the neuroanatomical heterogeneity in structural magnetic resonance imaging measures of cortical surface area (SA), cortical thickness (CT), subcortical volume (SV), and intracranial volume (ICV) in CHR-P in iduals compared with healthy controls (HC), and in relation to subsequent transition to a first episode of psychosis. The ENIGMA CHR-P consortium applied a harmonised analysis to neuroimaging data across 29 international sites, including 1579 CHR-P in iduals and 1243 HC, offering the largest pooled CHR-P neuroimaging dataset to date. Regional heterogeneity was indexed with the Variability Ratio (VR) and Coefficient of Variation (CV) ratio applied at the group level. Personalised estimates of heterogeneity of SA, CT and SV brain profiles were indexed with the novel Person-Based Similarity Index (PBSI), with two complementary applications. First, to assess the extent of within-diagnosis similarity or ergence of neuroanatomical profiles between in iduals. Second, using a normative modelling approach, to assess the ‘normativeness’ of neuroanatomical profiles in in iduals at CHR-P. CHR-P in iduals demonstrated no greater regional heterogeneity after applying FDR corrections. However, PBSI scores indicated significantly greater neuroanatomical ergence in global SA, CT and SV profiles in CHR-P in iduals compared with HC. Normative PBSI analysis identified 11 CHR-P in iduals (0.70%) with marked deviation ( .5 SD) in SA, 118 (7.47%) in CT and 161 (10.20%) in SV. Psychosis transition was not significantly associated with any measure of heterogeneity. Overall, our examination of neuroanatomical heterogeneity within the CHR-P state indicated greater ergence in neuroanatomical profiles at an in idual level, irrespective of psychosis conversion. Further large-scale investigations are required of those who demonstrate marked deviation.