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Combined correlation distributions for all participants calculated for oxy-hemoglobin (HbO), deoxy-hemoglobin (HbR), and total hemoglobin (HbT) concentration time series for different preprocessing approaches: before any regression is performed (gray), after regressing only the short channels (SC, red), and after regressing the short channels and systemic physiology (SC+Phys, green). Extracerebral regression has a large impact on the removal of spurious correlations.
