  A large body of literature has shown the substantial inter-regional
functional connectivity in the mammal brain. One important property remaining
un-studied is the cross-time interareal connection. This paper serves to
provide a tool to characterize the cross-time functional connectivity. The
method is extended from the temporal embedding based brain temporal coherence
analysis. Both synthetic data and in-vivo data were used to evaluate the
various properties of the cross-time functional connectivity matrix, which is
also called the cross-regional temporal coherence matrix.
