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The results of hemodynamic changes observed for 22 frontal cortical channels (Ch). Averaged hemodynamic changes (±SE) for oxy-Hb (A), deoxy-Hb (B), and total-Hb (C). Hemodynamic changes were averaged over eight trials. Channels with relatively small numbers were located in more anterior portions of the recorded area. Shades indicate a 10-s stimulation period. Units of hemodynamic change are given as mmol-mm.
