AFNI: software for analysis and visualization of functional magnetic resonance neuroimages
Computers and Biomedical Research
New Introduction to Multiple Time Series Analysis
New Introduction to Multiple Time Series Analysis
Estimation of a Structural Vector Autoregression Model Using Non-Gaussianity
The Journal of Machine Learning Research
GMAC: A Matlab toolbox for spectral Granger causality analysis of fMRI data
Computers in Biology and Medicine
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Vector autoregression (VAR) and structural equation modeling (SEM) are two popular brain-network modeling tools. VAR, which is a data-driven approach, assumes that connected regions exert time-lagged influences on one another. In contrast, the hypothesis-driven SEM is used to validate an existing connectivity model where connected regions have contemporaneous interactions among them. We present the two models in detail and discuss their applicability to FMRI data, and their interpretational limits. We also propose a unified approach that models both lagged and contemporaneous effects. The unifying model, structural vector autoregression (SVAR), may improve statistical and explanatory power, and avoid some prevalent pitfalls that can occur when VAR and SEM are utilized separately.