Ever wondered why getting your hair washed by the hair-stylist is so pleasurable? The head massage is practically the best part, and feels oh so good! Why is that? Turns out we have a lot of nerve endings on the scalp.
Head massages increase blood flow, which in turn makes the nice sensation feel even stronger. Our heads are normally not handled by other people, so when somebody stimulates the nerve endings it causes an explosion of endorphins, dopamine and serotonin in the brain.
What does it look like to first experience this sensation? Watch this kid experience bliss: