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Interhemispheric Granger Causality averaged over all channels and frequencies 0.01-0.1 Hz for each subject. Group averaged values are shown in the right panels. Granger Causality was greater ‘from-the-right-to-the-left’ (i.e., left ← right) than ‘from-the-left-to-the-right’ (i.e., left → right). This difference was significant for the HbO signal (paired t-test, p < 0.05, the top-right panel) while the HbR signal also showed a similar trend.
