Biological Cybernetics

, Volume 105, Issue 5–6, pp 331–347 | Cite as

On the spectral formulation of Granger causality

Original Paper

Abstract

Spectral measures of causality are used to explore the role of different rhythms in the causal connectivity between brain regions. We study several spectral measures related to Granger causality, comprising the bivariate and conditional Geweke measures, the directed transfer function, and the partial directed coherence. We derive the formulation of dependence and causality in the spectral domain from the more general formulation in the information-theory framework. We argue that the transfer entropy, the most general measure derived from the concept of Granger causality, lacks a spectral representation in terms of only the processes associated with the recorded signals. For all the spectral measures we show how they are related to mutual information rates when explicitly considering the parametric autoregressive representation of the processes. In this way we express the conditional Geweke spectral measure in terms of a multiple coherence involving innovation variables inherent to the autoregressive representation. We also link partial directed coherence with Sims’ criterion of causality. Given our results, we discuss the causal interpretation of the spectral measures related to Granger causality and stress the necessity to explicitly consider their specific formulation based on modeling the signals as linear Gaussian stationary autoregressive processes.

Keywords

Granger causality Partial directed coherence Directed transfer function Transfer entropy Sims causality Multivariate processes 

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  1. 1.Department of Information and Communication TechnologiesUniversitat Pompeu FabraBarcelonaSpain

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