How meditation changes the brain: what the science says

You may have read that 8 weeks of meditation grows your brain. A larger study couldn’t find that. But meditation does have real, measurable benefits. Here’s the honest picture.

By the Daily Recall team · Updated October 3, 2026 · 9 sources

Meditation has become one of the most studied wellbeing practices in neuroscience. Some of the early findings were exciting, a few have not held up, and some solid, practical benefits have emerged. Here’s where the evidence stands.

The famous “8 weeks grows your brain” study

In 2011, Britta Hölzel and colleagues scanned 16 people before and after an 8-week Mindfulness-Based Stress Reduction (MBSR) course, comparing them with 17 people who didn’t take it. The meditation group showed increased grey matter density in several regions, including the hippocampus. The study was widely reported as proof that meditation reshapes the brain in weeks.

It was a small study, though. In 2022, Tammi Kral and colleagues at the University of Wisconsin–Madison ran a much larger test: two randomized trials with 218 people who had never meditated, comparing MBSR with an active health program and a waitlist. They found no evidence that 8 weeks of MBSR changed brain structure. The authors suggest structural change, if it happens, may need far longer practice.

What long-term meditators show

Studies of experienced meditators find differences. In 2005, Sara Lazar’s team found thicker cortex in parts of the prefrontal cortex and insula in 20 experienced meditators compared with 15 non-meditators, with the biggest difference in older participants. But comparing groups at one point in time can’t show that meditation caused the difference; people who stick with meditation for years may differ in other ways.

Meditation and mind-wandering

The clearest brain finding involves the default mode network, a set of regions most active when your mind drifts to the past, the future or yourself. A 2011 study by Judson Brewer and colleagues found experienced meditators had less activity in its main hubs, across three different styles of meditation.

That matters because we drift a lot. In a 2010 study of 2,250 people, minds were wandering 46.9% of the time, and people were less happy when their minds wandered. See attention span for more.

Does meditation improve memory?

For working memory, the evidence is promising:

• In a 2013 study, 48 students did either 2 weeks of mindfulness classes or a nutrition class. The mindfulness group improved in working memory, mind-wandered less, and scored higher on a reading test. It was a small study.
• A 2025 meta-analysis of 43 studies found a medium-sized benefit for working memory in randomized trials, larger in younger people and longer programs, while calling for more rigorous trials.

Less is known about long-term memory, and a major 2014 review found low or insufficient evidence that meditation improves attention in general. The honest summary: likely helpful, not yet proven.

Anxiety, stress and mood

Here the evidence is stronger. A 2014 review in JAMA Internal Medicine by Madhav Goyal and colleagues analyzed 47 trials with more than 3,500 people. Mindfulness programs gave moderate improvements in anxiety, depression and pain. They weren’t better than other active treatments such as exercise or therapy, but they were comparable. The US National Center for Complementary and Integrative Health (NCCIH) reports a 2018 analysis that found similar results for anxiety and depression. Since chronic stress affects memory (see stress and memory), that’s a meaningful indirect benefit.

Is meditation safe?

For most people, yes. But NCCIH notes a 2020 review of 83 studies in which about 8% of participants had a negative effect, most often anxiety or depression. Meditation shouldn’t replace medical or mental health care, and people with significant anxiety, depression or trauma should talk to a clinician before starting an intensive practice.

How to start

• Start small: 5 to 10 minutes a day is enough to begin.
• Pick an anchor: your breath, sounds or bodily sensations. When your mind wanders (it will), notice and gently come back. That return is the practice.
• Try a course: MBSR is the most-studied format and is widely available.
• Be consistent: a little every day beats an hour once a week.

Test your working memory

A digit span test needs the same steady, single-pointed attention meditation trains. Try it:

The daily Sequence game is the full version. Try a round before and after a short meditation and see whether you notice any difference.

Sources

1. Hölzel et al. (2011), Psychiatry Research: Neuroimaging: mindfulness practice and regional brain grey matter density
2. Kral et al. (2022), Science Advances: no evidence of structural brain change with short-term mindfulness training (UW–Madison)
3. Lazar et al. (2005), NeuroReport: meditation experience is associated with increased cortical thickness
4. Brewer et al. (2011), PNAS: meditation experience and default mode network activity
5. Killingsworth & Gilbert (2010), Science: a wandering mind is an unhappy mind (Harvard Gazette)
6. Goyal et al. (2014), JAMA Internal Medicine: meditation programs for psychological stress and well-being
7. Mindfulness (2025): mindfulness-based interventions and working memory, a meta-analysis
8. Mrazek et al. (2013), Psychological Science: mindfulness training improves working memory (ScienceDaily)
9. NCCIH: Meditation and mindfulness, effectiveness and safety

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