TY - JOUR
T1 - Predicting haemodynamic networks using electrophysiology
T2 - The role of non-linear and cross-frequency interactions
AU - Tewarie, P.
AU - Bright, M.G.
AU - Hillebrand, A.
AU - Robson, S.E.
AU - Gascoyne, L.E.
AU - Morris, P.G.
AU - Meier, J.
AU - Van Mieghem, P.
AU - Brookes, M.J.
PY - 2016
Y1 - 2016
N2 - Understanding the electrophysiological basis of resting state networks (RSNs) in the human brain is a critical step towards elucidating how inter-areal connectivity supports healthy brain function. In recent years, the relationship between RSNs (typically measured using haemodynamic signals) and electrophysiology has been explored using functional Magnetic Resonance Imaging (fMRI) and magnetoencephalography (MEG). Significant progress has been made, with similar spatial structure observable in both modalities. However, there is a pressing need to understand this relationship beyond simple visual similarity of RSN patterns. Here, we introduce a mathematical model to predict fMRI-based RSNs using MEG. Our unique model, based upon a multivariate Taylor series, incorporates both phase and amplitude based MEG connectivity metrics, as well as linear and non-linear interactions within and between neural oscillations measured in multiple frequency bands. We show that including non-linear interactions, multiple frequency bands and cross-frequency terms significantly improves fMRI network prediction. This shows that fMRI connectivity is not only the result of direct electrophysiological connections, but is also driven by the overlap of connectivity profiles between separate regions. Our results indicate that a complete understanding of the electrophysiological basis of RSNs goes beyond simple frequency-specific analysis, and further exploration of non-linear and cross-frequency interactions will shed new light on distributed network connectivity, and its perturbation in pathology.
AB - Understanding the electrophysiological basis of resting state networks (RSNs) in the human brain is a critical step towards elucidating how inter-areal connectivity supports healthy brain function. In recent years, the relationship between RSNs (typically measured using haemodynamic signals) and electrophysiology has been explored using functional Magnetic Resonance Imaging (fMRI) and magnetoencephalography (MEG). Significant progress has been made, with similar spatial structure observable in both modalities. However, there is a pressing need to understand this relationship beyond simple visual similarity of RSN patterns. Here, we introduce a mathematical model to predict fMRI-based RSNs using MEG. Our unique model, based upon a multivariate Taylor series, incorporates both phase and amplitude based MEG connectivity metrics, as well as linear and non-linear interactions within and between neural oscillations measured in multiple frequency bands. We show that including non-linear interactions, multiple frequency bands and cross-frequency terms significantly improves fMRI network prediction. This shows that fMRI connectivity is not only the result of direct electrophysiological connections, but is also driven by the overlap of connectivity profiles between separate regions. Our results indicate that a complete understanding of the electrophysiological basis of RSNs goes beyond simple frequency-specific analysis, and further exploration of non-linear and cross-frequency interactions will shed new light on distributed network connectivity, and its perturbation in pathology.
KW - FMRI
KW - Functional connectivity
KW - Functional magnetic resonance imaging
KW - Magnetoencephalography
KW - Mapping
KW - MEG
KW - Multivariate Taylor series
KW - Relationship between fMRI and MEG
KW - Resting state network
KW - RSN
UR - http://www.scopus.com/inward/record.url?scp=84959321805&partnerID=8YFLogxK
UR - http://resolver.tudelft.nl/uuid:14218446-9276-43dd-9ddf-94e17d8b2337
U2 - 10.1016/j.neuroimage.2016.01.053
DO - 10.1016/j.neuroimage.2016.01.053
M3 - Article
C2 - 26827811
AN - SCOPUS:84959321805
SN - 1053-8119
VL - 130
SP - 273
EP - 292
JO - NeuroImage
JF - NeuroImage
ER -