”Thought Field Therapy (TFT) is a fringe psychological treatment developed by an American psychologist, Roger Callahan. Its proponents say that it can heal a variety of mental and physical ailments through specialized "tapping" with the fingers at meridian points on the upper body and hands.
The theory behind TFT is a mixture of concepts "derived from a variety of sources. Foremost among these is the ancient Chinese philosophy of chi, which is thought to be the 'life force' that flows throughout the body". Callahan also bases his theory upon applied kinesiology and physics.
There is no scientific evidence that TFT is effective, and the American Psychological Association has stated that it "lacks a scientific basis."