Meditation is a family of mental practices that train attention and awareness. Some styles hold attention on a single object, such as the breath, a sound, an image or a repeated word (a mantra); others, like mindfulness, involve noticing whatever arises in the present moment without judging it. The U.S. National Center for Complementary and Integrative Health (NCCIH) describes it in exactly those terms: practices that focus attention, and a mindful awareness of the present moment "without making judgments."
It matters because meditation sits in two worlds at once: it is one of the oldest contemplative disciplines on record and one of the most-studied mind-body practices in modern psychology. Knowing what the research actually supports, and where it stops, helps anyone build a practice that is realistic and safe.
What is meditation, in plain terms?
Meditation is deliberate training of attention: choosing where the mind rests, noticing when it drifts, and bringing it back. Each time a practitioner catches the mind wandering and returns to the breath or the mantra, that cycle of noticing and returning is the exercise itself, not a sign of failure.
Mindfulness is one specific kind of meditation, not a synonym for all of it. NCCIH frames mindfulness as paying attention to the present moment, including thoughts, feelings and body sensations, without judgment. Other forms work differently: some narrow attention to one point, some repeat a sound until effort falls away, and some cultivate an emotional quality such as kindness.
Where does meditation come from?
Meditation has roots across many of the world's religious and philosophical traditions. In India, the Sanskrit term dhyana, usually translated as meditation or absorption, appears in Hindu yoga traditions, including the Upanishads and Patanjali's Yoga Sutras, where dhyana is one of the eight limbs of yoga. Buddhism developed two complementary strands: samatha, the cultivation of calm and concentration, and vipassana, insight into the changing nature of experience. The English word "mindfulness" is the standard translation of the Pali term sati.
Parallel practices grew up elsewhere. Daoist traditions in China developed sitting and breathing practices aimed at stillness, Christian monastic and mystical writers taught forms of contemplative prayer, and Sufi orders in Islam practise dhikr, the rhythmic remembrance of God through repeated phrases.
In the twentieth century meditation moved into Western clinics and laboratories. Maharishi Mahesh Yogi spread Transcendental Meditation (TM), a mantra-based technique, worldwide from the late 1950s. In 1975 the Harvard cardiologist Herbert Benson published The Relaxation Response, describing a simple, secular way of eliciting the body's calming response through a repeated word and a passive attitude. Then, in 1979, Jon Kabat-Zinn began Mindfulness-Based Stress Reduction (MBSR) at the University of Massachusetts Medical School, an eight-week course that carried mindfulness into hospitals and, eventually, into thousands of research studies.
What are the main types of meditation?
Researchers group meditation styles by what the mind is asked to do. A widely cited framework comes from Antoine Lutz, Heleen Slagter, John Dunne and Richard Davidson, writing in Trends in Cognitive Sciences in 2008, who distinguished two broad families. A later review by Madhav Goyal and colleagues at Johns Hopkins added a third category for mantra techniques such as TM.
Focused attention
Focused-attention meditation means holding attention on one chosen object, most often the breath, and returning to it each time the mind wanders. It trains concentration and the ability to notice distraction early. Counting breaths and gazing at a candle flame belong here.
Open monitoring
Open-monitoring meditation widens the field. Instead of fixing on one object, the practitioner notices whatever arises, a sound, an itch, a memory, a mood, without holding on to it or pushing it away. Much of what is taught as mindfulness, including the core of MBSR, sits in this family, usually built on a foundation of focused attention.
Automatic self-transcendence
Goyal and colleagues used the phrase "automatic self-transcendence" for techniques like TM, in which a mantra is repeated in a way meant to become effortless, allowing the mind to settle without deliberate concentration.
Loving-kindness, compassion and movement
Two further forms are common. Loving-kindness and compassion practices (metta in the Buddhist tradition) involve silently offering phrases of goodwill to oneself and others, deliberately cultivating a warm emotional tone. Movement-based forms bring meditative attention to the body in motion: walking meditation is the classic example, described in the site's guide to walking meditation, and practices such as tai chi and yoga are often studied alongside meditation. Breath-centred methods overlap here too; the breathwork and Wim Hof method explainer covers where controlled breathing differs from meditative attention to the breath.
What does the research actually show?
The best-known summary is a systematic review and meta-analysis led by Madhav Goyal of Johns Hopkins, "Meditation Programs for Psychological Stress and Well-being," published in JAMA Internal Medicine (volume 174, issue 3, pages 357–368) and released online on 6 January 2014. The team screened nearly 19,000 citations and kept 47 randomised controlled trials with 3,515 participants. Crucially, they included only trials with an active control group, meaning meditation was compared with something else that matched for time and attention, rather than with doing nothing.
Their findings were measured. Mindfulness programmes showed moderate evidence of improved anxiety, with an effect size of 0.38 at eight weeks and 0.22 at three to six months; depression, at 0.30 at eight weeks and 0.23 at three to six months; and pain, at 0.33. Evidence was low for improvements in stress or distress and mental-health-related quality of life, and the review found low evidence of no effect, or insufficient evidence, for positive mood, attention, substance use, eating habits, sleep and weight. For mantra programmes, the review found low evidence of no effect, or insufficient evidence, on the outcomes it examined. Meditation programmes were not shown to be better than active treatments such as drugs, exercise or other behavioural therapies. The authors summed it up as "small to moderate reductions of multiple negative dimensions of psychological stress."
NCCIH's current overview reaches a similar verdict: much of the research has been preliminary or not scientifically rigorous, and results are mixed. On sleep, for example, NCCIH reports a 2019 analysis of 18 studies in which mindfulness improved sleep quality more than education-based approaches but did no better than evidence-based options such as cognitive behavioural therapy and exercise. The fair reading: a reasonable, low-cost practice that may support well-being, not a replacement for proven care.
What happens in the brain when the mind wanders?
The brain research centres on the default mode network, a set of regions that are active when a person is not focused on an outside task: daydreaming, replaying conversations, planning or thinking about oneself. Marcus Raichle's group at Washington University named this "default mode" of brain function in a 2001 paper in the Proceedings of the National Academy of Sciences.
Mind-wandering is extremely common. In a 2010 study in Science, Harvard psychologists Matthew Killingsworth and Daniel Gilbert used an iPhone app to contact 2,250 adults at random moments. People reported that their minds were wandering in 46.9 percent of samples, and they were less happy when their minds wandered than when they were not. The paper's title captured the finding: "A Wandering Mind Is an Unhappy Mind."
In 2011 a Yale team led by Judson Brewer reported in PNAS that experienced meditators showed less activity than novices in two main hubs of the default mode network, the medial prefrontal cortex and the posterior cingulate cortex, across three different techniques, both while meditating and at rest. It is an intriguing result, but it is an association in a small imaging study. It does not prove that meditation causes those differences or that they translate into specific benefits. Claims that meditation "rewires" or "grows" the brain go further than the evidence currently allows. The site's earlier post on how meditation may shape the brain should be read with that caution in mind.
Is meditation safe?
For most people meditation is considered low risk, but it is not risk free, and few studies have looked carefully for harms. A 2020 systematic review led by Miguel Farias in Acta Psychiatrica Scandinavica pooled 83 studies with 6,703 participants and found that about 8 percent of participants reported a negative effect, most often anxiety or depression. NCCIH notes that this rate is similar to what is reported for psychological therapies.
People with a history of trauma, psychosis or other psychiatric conditions should start with a qualified teacher and talk to their clinician first. NCCIH also warns against using meditation to replace conventional care or to postpone seeing a health care provider. Anyone with a health concern should speak with a clinician.
How to start meditating
A simple routine is enough to begin:
- Keep it short. Start with 5 to 10 minutes a day. Consistency matters more than length.
- Pick a time and place. The same chair at the same time each day helps the habit stick.
- Sit comfortably. A chair or cushion is fine. Keep the back upright but not rigid, and let the hands rest.
- Attend to the breath. Notice the sensation of air at the nostrils or the rise and fall of the belly. There is no need to control it.
- Notice and return. The mind will wander, often within seconds. When it does, note it without criticism and come back to the breath. That return is the practice.
- Try a guided session. A recorded voice can make the first weeks easier. Some people also experiment with sound, from singing bowls to binaural beats, though the evidence for audio aids is thinner than for the practice itself.
- Consider a trained instructor. For MBSR, TM or a retreat, ask about the teacher's training and experience, as NCCIH recommends.
Billy Carson's reading
Billy Carson treats meditation as a daily discipline rather than an occasional relaxation tool. In his talk on the benefits of meditation, embedded on this page and also released on the 4biddenknowledge Podcast on 17 December 2024, he makes his case for building a regular practice, and the episode was released alongside an invitation to join a mass guided meditation.
His wider work places meditation inside a consciousness-first worldview. In the third-eye and pineal-gland pillar, Carson frames inner perception as a faculty developed gradually through quiet, trained attention rather than a switch flipped in a single session. His long-running Meditation Monday sessions have drawn on OM chanting, singing bowls and walking meditation, along with group events such as a winter-solstice global meditation for peace and unity. These are his practices and his interpretation; they sit alongside the clinical research summarised above rather than being tested by it.
Watch, read and go deeper
The Meditation collection on 4BK TV gathers guided meditations and frequency sessions for relaxation, focus and sleep. Billy's talk on daily practice is also available as a podcast episode for listening on the go. For the wider picture of mind, awareness and inner experience, start at the Consciousness topic hub, which connects this guide to the site's articles on the third eye, breathwork and sound.
Frequently asked questions
How long should a beginner meditate each day?
Five to ten minutes a day is a sensible starting point. Short, regular sessions are easier to sustain than long, occasional ones. Length can increase once the habit is steady.
Which type of meditation is best?
No single technique has been shown to be superior. The 2014 Johns Hopkins review found the clearest evidence for mindfulness programmes, while the evidence for mantra programmes was low or insufficient, but that reflects the studies available rather than a final verdict. The best type is usually the one a person will actually practise consistently.
Is mindfulness the same as meditation?
Not exactly. Mindfulness, present-moment awareness without judgment, is one style of meditation and can also be practised informally while walking, eating or working. Meditation is the broader category, which includes focused attention, mantra techniques, loving-kindness practice and movement forms.
Can meditation replace therapy or medication?
No. The research shows small to moderate effects on measures of psychological stress and no evidence that meditation programmes outperform active treatments such as drugs, exercise or behavioural therapies. NCCIH advises against using meditation to replace conventional care or delay seeing a provider, so anyone with a health concern should talk to a clinician.
Is it normal for the mind to wander during meditation?
Yes. Wandering is expected, and in daily life people's minds wander in nearly half of sampled moments, according to Killingsworth and Gilbert's 2010 study. Noticing the drift and gently returning attention is the core skill meditation trains.
Sources and further reading
- Madhav Goyal et al., "Meditation Programs for Psychological Stress and Well-being: A Systematic Review and Meta-analysis," JAMA Internal Medicine 174, no. 3 (2014): 357–368
- Antoine Lutz, Heleen A. Slagter, John D. Dunne and Richard J. Davidson, "Attention Regulation and Monitoring in Meditation," Trends in Cognitive Sciences 12, no. 4 (2008)
- Marcus E. Raichle et al., "A Default Mode of Brain Function," Proceedings of the National Academy of Sciences 98, no. 2 (2001)
- Matthew A. Killingsworth and Daniel T. Gilbert, "A Wandering Mind Is an Unhappy Mind," Science 330 (2010)
- Judson A. Brewer et al., "Meditation Experience Is Associated with Differences in Default Mode Network Activity and Connectivity," PNAS 108, no. 50 (2011)
- Miguel Farias et al., "Adverse Events in Meditation Practices and Meditation-Based Therapies: A Systematic Review," Acta Psychiatrica Scandinavica (2020)
- National Center for Complementary and Integrative Health, "Meditation and Mindfulness: Effectiveness and Safety"
- Herbert Benson, The Relaxation Response (1975); Jon Kabat-Zinn, Full Catastrophe Living (1990)
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