Grey matter biomarker identification in Schizophrenia: detecting regional alterations and their underlying substrates

Abstract

Highlights• We present a sparse machine learning framework to identify biologically meaningful neuroanatomical biomarkers for Schizophrenia • Our framework addresses methodological pitfalls associated with application of machine learning on structural MRI data in Schizophrenia raised by several recent reviews • Our pipeline is easy to replicate using widely available software packages • The presented framework is geared towards identification of specific changes in brain regions that relate directly to the pathology rather than classification per se Abstract State-of-the-art approaches in Schizophrenia research investigate neuroanatomical biomarkers using structural Magnetic Resonance Imaging. However, current models are 1) voxel-wise, 2) difficult to interpret in biologically meaningful ways, and 3) difficult to replicate across studies.Here, we propose a machine learning framework that enables the identification of sparse, regionwise grey matter neuroanatomical biomarkers and their underlying biological substrates by integrating well-established statistical and machine learning approaches. We address the computational issues associated with application of machine learning on structural MRI data in Schizophrenia, as discussed in recent reviews, while promoting transparent science using widely available data and software. In this work, a cohort of patients with Schizophrenia and healthy controls was used. It was found that the cortical thickness in left pars orbitalis seems to be the most reliable measure for distinguishing patients with Schizophrenia from healthy controls.