Dr. Lipov says, "What really intrigued me about Dr, DeWall's study was he showed Tylenol exerted this emotional effect by acting on the insular cortex of the brain. That's exactly the same area that's affected by a Stellate Ganglion Block.[4]" The specialist is also Director of Chronic Pain Research at Northwest Community Hospital in Arlington Heights.
http://www.medicalnewstoday.com/releases/227298.php