Delineating between-subject heterogeneity in alpha networks with Spatio-Spectral Eigenmodes.

Autor: Quinn AJ; Oxford Centre for Human Brain Activity, Wellcome Centre for Integrative Neuroimaging, University Department of Psychiatry, Warneford Hospital, Oxford OX3 7JX, UK. Electronic address: andrew.quinn@psych.ox.ac.uk., Green GGR; York Neuroimaging Centre, The Biocentre York Science Park, Heslington, York YO10 5NY, UK; Department of Psychology, University of York, Heslington, York YO10 5DD, UK., Hymers M; York Neuroimaging Centre, The Biocentre York Science Park, Heslington, York YO10 5NY, UK; Department of Psychology, University of York, Heslington, York YO10 5DD, UK.
Jazyk: angličtina
Zdroj: NeuroImage [Neuroimage] 2021 Oct 15; Vol. 240, pp. 118330. Date of Electronic Publication: 2021 Jul 06.
DOI: 10.1016/j.neuroimage.2021.118330
Abstrakt: Between subject variability in the spatial and spectral structure of oscillatory networks can be highly informative but poses a considerable analytic challenge. Here, we describe a data-driven modal decomposition of a multivariate autoregressive model that simultaneously identifies oscillations by their peak frequency, damping time and network structure. We use this decomposition to define a set of Spatio-Spectral Eigenmodes (SSEs) providing a parsimonious description of oscillatory networks. We show that the multivariate system transfer function can be rewritten in these modal coordinates, and that the full transfer function is a linear superposition of all modes in the decomposition. The modal transfer function is a linear summation and therefore allows for single oscillatory signals to be isolated and analysed in terms of their spectral content, spatial distribution and network structure. We validate the method on simulated data and explore the structure of whole brain oscillatory networks in eyes-open resting state MEG data from the Human Connectome Project. We are able to show a wide between participant variability in peak frequency and network structure of alpha oscillations and show a distinction between occipital 'high-frequency alpha' and parietal 'low-frequency alpha'. The frequency difference between occipital and parietal alpha components is present within individual participants but is partially masked by larger between subject variability; a 10Hz oscillation may represent the high-frequency occipital component in one participant and the low-frequency parietal component in another. This rich characterisation of individual neural phenotypes has the potential to enhance analyses into the relationship between neural dynamics and a person's behavioural, cognitive or clinical state.
(Copyright © 2021. Published by Elsevier Inc.)
Databáze: MEDLINE
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