Partial directed coherence: a new concept in neural structure determination

This paper introduces a new frequency-domain approach to describe the relat ionships (direction of information flow) between multivariate time series b ased on the decomposition of multivariate partial coherences computed from multivariate autoregressive models. We discuss its application and compare its performance to other approaches to the problem of determining neural st ructure relations from the simultaneous measurement of neural electrophysio logical signals. The new concept is shown to reflect a frequency-domain rep resentation of the concept of Granger causality.