Figure 7.

The simultaneous responses in the bilateral prefrontal Oxy‐Hb and forehead and cheek skin blood flow during viewing a comedy movie (A) and during conversation (B) in a subject. Whenever conversation was made by asking the subjective ratings of pleasantness and consciousness, an increase in the prefrontal Oxy‐Hb was observed on both sides, despite no change in the prefrontal Deoxy‐Hb (not shown). On the other hand, both forehead and cheek skin blood flow did not represent substantial changes during conversation, although the facial skin blood flows decreased during viewing a comedy movie, simultaneously with the decrease in the prefrontal Oxy‐Hb.