Fig. 3.

Group average of the hemodynamic response function (HRF) for each channel. The time window used for statistical analysis (12–22 s) is denoted by the dotted vertical lines. HbO = oxygenated hemoglobin. HbR = deoxygenated hemoglobin. FP = frontal pole. DLPFC = dorsolateral prefrontal cortex. VLPFC = ventrolateral prefrontal cortex.