Meditation improves focus

Meditation courses produce a small improvement on some tests of attention and memory compared with doing nothing. Whether they do better than another activity that takes the same time and attention is less settled: one large pooled analysis found no advantage, a larger one found a small advantage in accuracy but not in speed, and two recent trials in older adults found none. A 2022 review pooled 45 randomized trials in 2,238 adults tested with objective tasks rather than questionnaires. It found a small overall effect on thinking skills (effect size 0.15) and on working memory (0.23), no clear change in attention on its own (0.12 across 22 trials), and no advantage over matched comparison activities (0.07). A 2024 review pooled 111 randomized trials in 9,538 children and adults and also counted self-guided programs, questionnaires and unpublished theses. Against matched activities it found small advantages in the accuracy of sustained attention (0.21) and in keeping focus when information conflicts (0.19), and no change in speed.

Children and teenagers show a similar pattern. A 2022 review of 66 randomized trials in 20,138 young people found better attention after mindfulness programs than after no program (0.35 across 14 trials), no difference against active comparison programs (0.04 across 11 trials), and no lasting benefit in the trials that followed pupils up. In children and teenagers with ADHD, a 2026 review of 17 trials found a small improvement in inattention (0.30), mostly on ratings by people who knew who had received the program and mostly against waiting lists. In adults with ADHD, a 2025 review of ten trials found improvements in symptoms as rated by participants (0.48) and by observers (0.32), compared with waiting lists, usual care or psychoeducation. UK national ADHD guidance does not include meditation or mindfulness among the treatments it recommends.

The two adult reviews counted different things. The 2022 review took only in-person group courses and objective tests, and excluded apps, retreats and mantra meditation. In it, effects reached significance in people over 60 (0.21) and in people without a health condition (0.18), but not in adults under 60 (0.11) or in clinical groups (0.09). These are scores on thinking tests, not measures of dementia risk. Standard eight-week courses, Mindfulness-Based Stress Reduction and Mindfulness-Based Cognitive Therapy, showed no clear effect (0.04), while modified and generic programs did better. Trials were small, with a median of 43 people, and only a minority were judged at lower risk of bias. The 2024 review searched to the end of 2022 and took any program of two or more sessions whose main aim was teaching mindfulness to people who had not meditated before. Against waiting lists or no program it found small improvements in sustained attention accuracy (0.37) and in keeping focus when information conflicts (0.30); against matched activities these were 0.21 and 0.19. Measures of speed, verbal fluency and episodic memory did not change. Against waiting lists, overall thinking scores and working memory improved more in trials that analysed only the people who finished the course than in trials that analysed everyone assigned. Against matched activities, effects were larger for face-to-face than for self-guided programs. Effects were also larger in people with raised mental health symptoms than in healthy volunteers.

Individual trials show how much the comparison matters. In a 2014 trial, 63 adults were randomly assigned to an eight-week Mindfulness-Based Stress Reduction course or to a health program matched for time and group contact, with the researchers unaware of who was in which group; sustained attention on a computer vigilance task changed the same way in both groups. A 2026 trial used a similar design in 150 adults aged 65 to 85 and followed them for a year: the course did not improve most measures of sustained attention or mind-wandering more than the matched health class, apart from a small effect on self-reported off-task thoughts. In a 2022 trial, 585 adults aged 65 to 84 with concerns about their thinking or memory were assigned to the same course with monthly classes for 18 months, to exercise, to both, or to health education; mindfulness did not improve memory or executive function scores at 6 or 18 months. In a 2010 trial, 60 people who already meditated, about 2,600 lifetime hours on average, were randomly assigned to a three-month retreat of about five hours a day of breath-focused practice or to wait their turn. The retreat group improved in fine visual discrimination and held attention better over a long vigilance task. That retreat was many times the practice of an eight-week course, in experienced practitioners.

In the 2026 ADHD review, 9 of the 17 trials compared mindfulness with a waiting list, and 6 were judged at high risk of bias in how outcomes were measured because they relied on ratings by people who were not blinded. Effects were larger for hyperactivity and impulsivity (0.54) than for inattention, smaller on executive function tasks (0.23), and larger in samples with an average age above 10. Only one of the 17 trials compared mindfulness with medication. One such trial, published in 2024, assigned 91 children aged 9 to 18 with ADHD to a family mindfulness program or to four months of the stimulant methylphenidate. Parent ratings of inattention, hyperactivity and attention problems improved more with medication at 2 and 4 months. Teacher ratings, a blind observer's ratings and tests of attention at 2 months showed no difference between the two. By 10 months the parent ratings no longer differed, but by then 46.5 percent of the mindfulness arm were taking medication and 23.7 percent of the medication arm had stopped it. The main results were parent ratings from families who knew which treatment they had, and the senior author earns royalties from the program tested. In the 2025 review of adults with ADHD, everyday functioning also improved (0.56) while mood and mindfulness skills did not change; results were measured right after the programs, and trials that combined mindfulness with medication or another therapy were left out, so the review does not show how mindfulness compares with medication or what it adds to it. The US National Center for Complementary and Integrative Health describes the ADHD studies as not of high quality and their results as mixed. The UK guideline (NICE, 2018, updated 2019) recommends medication for children aged 5 and over whose symptoms still cause significant impairment after changes to their environment, and considering cognitive behavioural therapy for young people who have benefited from medication but are still significantly impaired; its recommendations do not mention mindfulness or meditation.

Unwanted effects occur. A 2020 review of 83 studies found them in about 8 percent of meditators overall, most often anxiety or low mood, and in 3.7 percent of participants in experimental studies.