Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Mean Geweke's Granger causality between simulated fMRI time series as a function of R and d for fixed I=0.5 without downsampling (left), with downsampling with TR=1s (middle) and TR=2s (right). The black surface represents the statistical threshold.
