Next, the participant is introduced to a method of encouraging his mind and body to strive to achieve a state of resonance through utterance of a single tone, a monotonous, protracted humming sound that sets up a feeling of vibration particularly in the head.
The sensitivity of his nervous system, his general state of mind, and the extent to which he may have previously developed facility in related techniques such as transcendental meditation are all pertinent factors affecting the speed at which he may expect to progress.