Is it true that the Cerebral Blood Flow (CBF) in brain improves?
If we look inside the head using a near infrared rays (a machine known as Light Topography manufactured by Hitachi Medical) during the state of lip muscle training, at one glance we will admit that the blood circulation has increased distinctly on the right frontal lobes. However, the same experiment has denied any changes to the brain’s blood flow even when one chews a gum. Apparently, it is necessary for one to move his lips substantially by talking or lip muscle training in order to prevent becoming senile.