Mark Patterson in his book, Whisper, tells the story of a renown opera singer who mysteriously loses his ability to hit certain notes even though those notes where well within his vocal range. The singer went to ear, nose and throat specialists, all of whom diagnosed a vocal problem. Dr. Tomatis thought otherwise. Using a tonometer, Dr. Tomatis discovered that even an average opera singer produces a 140 decibel sound wave at a meter’s distance (which is slightly louder than a military jet taking off from an aircraft carrier). That discovery led to the discovery that the opera singer had deafened himself to the sound of his own voice. Dr. Tomatis learned that “the voice can only reproduce what the ear can hear.” The French Academy of Medicine dubbed this scenario the Tomatis effect.