Fig. (2) Grand average waveforms during the VFT task: Red line indicates grand averaged oxy-Hb data and blue line indicates grand averaged deoxy-Hb data. (A). Frontal hemodynamic change prior to the exercise therapy. (B). Frontal hemodynamic change after the exercise therapy. (C). Bilateral temporal hemodynamic change prior to the exercise therapy. (D). Bilateral temporal hemodynamic change after the exercise therapy. VFT: verbal fluency task.