Transcendental Meditation (TM) is a mantra-based technique that comes from the Vedic tradition of India. Maharishi Mahesh Yogi brought it to the West starting in the late 1950s. When the Beatles visited his ashram in Rishikesh, India, in 1968, TM reached a global audience and became the most commercially successful meditation movement in history. Today about six million people have practiced it, and it has produced more published research, over 600 peer-reviewed studies, than any other meditation technique. The practice is simple to do: you sit comfortably with your eyes closed and silently repeat an assigned Sanskrit mantra, a meaningless sound picked by a certified TM teacher using criteria they do not disclose, for 20 minutes twice a day. You do not concentrate on the mantra. You use it lightly. When thoughts come, you return to the mantra without forcing it. When the mantra itself fades into silence, as it often does with practice, you rest in that silence.
TM's supporters say the technique reliably produces a specific physical state they call 'restful alertness' or 'pure consciousness.' In it, the body rests more deeply than in sleep while the mind stays awake and alert. One study published in Science in 1972 by Herbert Benson and R.K. Wallace found that oxygen consumption drops 17 percent during TM, compared with 8 percent in sleep. EEG studies of TM practitioners show a distinctive pattern of alpha wave coherence: synchronized, high-amplitude alpha waves (8 to 12 Hz) spreading across the whole cortex, which is not usually seen in ordinary relaxation or other techniques. This alpha coherence is linked to relaxed, inward-turned wakefulness. Critics point out that independent studies have not consistently shown TM-specific effects beyond what other forms of meditation produce, and that many TM studies were run by researchers tied to the TM organization. Defenders answer that the sheer size and range of the research, covering heart health, PTSD treatment, and academic performance, is too large to write off as organizational bias alone.
Long-term TM practitioners describe a distinct development that Maharishi called 'cosmic consciousness': the witness state becomes stable. This is a steady background awareness that stays with you through all activity, even deep sleep. In ordinary consciousness, you identify with the contents of experience, your thoughts, emotions, sensations, and running story. In the witness state, a stable 'observing self' takes hold that nothing in experience can knock over. You are still thinking, feeling, and acting, but you are no longer lost in it. You watch your thoughts the way you watch clouds. Advaita Vedanta philosophers, Kashmir Shaivite teachers, and Zen masters describe this witnessing in very similar terms, which suggests it is a real developmental achievement, not just a passing state. People who have stabilized it describe it as a relief: even the most upsetting emotions can rise without the observer being swallowed by them.
The research on TM and heart health is some of the strongest in the whole meditation literature. A 2012 study in Circulation: Cardiovascular Quality and Outcomes, funded by the National Institutes of Health and run over five years, found that heart-disease patients who practiced TM had a 48 percent lower rate of the combined outcome of death, heart attack, and stroke compared with a control group. In a 2013 scientific statement, the American Heart Association reviewed the evidence and concluded that TM may be considered in clinical practice to lower blood pressure, giving it a Class IIB recommendation. It was the only meditation technique to get any formal AHA recommendation at the time. Whatever the reason, less stress, better regulation of the autonomic nervous system, or lower cortisol and catecholamines, the heart data is strong enough that cardiologists at major medical centers now recommend TM to patients.