your brain on yoga: what the research actually says

a review of the strongest evidence we have so far

Yoga is an ancient Indian science and way of life that combines specific postures, regulated breathing, and meditation (Gothe & McAuley, 2015). It is designed to balance physical, mental, emotional, and spiritual health. Hatha yoga, the most common form of yoga in the US (Nyer et al., 2018), centres on postures, breath awareness, and mental focus.

Prior to 2015, yoga had been reviewed for its effects on cancer-related psychological health (Lin et al., 2011), low back pain (Posadzki & Ernst, 2011), and type 2 diabetes (Aljasir et al., 2010), with findings generally suggesting it performs as well as, or better than, conventional exercise across multiple health outcomes. But no published review had looked specifically at yoga and cognitive function, until the meta-analysis by Gothe & McAuley, (2015) that this article focuses on.

Three elements are common across most styles of yoga: postures, breathing, and meditative exercise. Practice requires focused effort in holding a pose, controlling the body, and breathing at a steady rate. Breathing techniques (pranayama) and meditation are used to calm and focus the mind and develop greater self-awareness (Morone & Greco, 2007). This is what sets yoga apart from general physical activity, where attention is typically directed outward rather than inward. The argument, then, is that yoga's sustained attentional and mental demands on the breath, the body, and the present moment could generalise to conventionally assessed cognitive functions: attention, memory, and higher-order executive function.

the study

In 2015, researchers Gothe and McAuley published a meta-analysis in Psychosomatic Medicine. A meta-analysis statistically pools data across multiple studies into one combined effect size. Rather than asking "did this one study find something?", it asks "across all the research that exists, what does the overall signal look like?" This dramatically increases statistical power and produces a more stable, trustworthy estimate than any single trial alone.

They included 15 randomised controlled trials (RCTs) examining the chronic (over time, multiple sessions) effects of yoga practice, plus 7 studies examining what happens after just one single yoga session.

Their aims were threefold: to measure yoga's combined effect on cognition across both chronic and acute practice; to examine specific cognitive domains: attention, processing speed, executive function, and memory; and to identify limitations and future research directions.

what they found

Across the 15 RCTs, yoga was associated with a moderate improvement in cognitive function: an effect size of g = 0.33. To contextualise: an effect size of 0 means no effect; 1 or above represents a large effect. At 0.33, this is meaningful, though not strong.

The clearest and most consistent gains were in attention and processing speed (g = 0.29) and executive function (g = 0.27): your capacity for planning, focus, and cognitive control. These two domains showed the strongest, most reliable signal across the full set of studies. Memory showed a smaller effect (g = 0.18) that did not quite reach conventional statistical significance (p = .051), making it the weakest of the three.

Acute studies examining the effect of a single yoga session showed a stronger overall effect (g = 0.56) than the chronic RCTs. This pattern held broadly across attention, processing speed, and executive function, consistent with similar acute boosts seen in the wider exercise-cognition literature, where stress regulation is thought to play a role: yoga has been proposed to acutely lower cortisol, and elevated cortisol is well established as impairing prefrontal cortex function   (Arnsten, 2009), though this specific mechanism hasn't been directly tested in yoga-cognition research.

One acute finding stands out: memory improved by g = 0.78 immediately post-session, the largest single number in the entire meta-analysis. But this is also the figure most likely to mislead. It rests on only a handful of studies using inconsistent memory tests, sits in direct contrast to memory being the weakest domain across the RCTs, and may simply reflect one or two outlier results rather than a genuine effect. The authors themselves flag the need for follow-up testing, since nobody measured how long any immediate boost actually lasts.

what this doesn't mean

The authors flag significant limitations. Yoga styles varied considerably across studies: Hatha, Kundalini, and Iyengar. These practices are very different, making comparison difficult. Most studies were conducted in India, where breathing and meditation protocols were more consistently included, making it hard to isolate which component of practice is driving any cognitive change. Cognitive tests were not standardised: different studies used different measures of "cognition," making it difficult to know whether the pooled g = 0.33 reflects a genuine, consistent benefit or an average across incomparable measurements of fundamentally different mental processes. The goal of a meta-analysis is to pool multiple studies, and the more similar the intervention (the less heterogeneity), the more stable and trustworthy an estimate of its true effect is. 

Until researchers agree on a shared battery of validated tests, it remains unclear exactly which aspects of cognition yoga improves, and whether those findings would replicate. Finally, studies did not adequately account for confounders like social support, instructor attention, or participant expectations, all of which could independently influence outcomes.

Overall, these limitations affect how we should interpret the findings - with caution. Although this meta-analysis is the strongest in its field, showing promising results, it is not proof.

future research suggestions

Using stronger control groups such as traditional exercise, while comparing yoga using the same cognitive tests, will purely isolate the specific effect of yoga alone and rule out placebo-type effects. Furthermore, standardising the yoga intervention type, duration, and frequency so that findings of separate studies can be meaningfully compared and combined in a meta-analysis.

Researchers should also isolate the independent contribution of postures, breathing, and meditation to better understand which element of practice drives which cognitive outcome. Neuroimaging will be essential for investigating the neurobiological mechanisms underlying these changes.

why it matters anyway

For decades, the brain health conversation has been dominated by aerobic exercise: running, cycling, cardio. This meta-analysis placed yoga on the same research map. It demonstrated that a practice combining physical postures, breathwork, and meditation can produce measurable cognitive effects, detectable both acutely and over time.

For those of us who practice, who know what it feels like to step off a mat with a clearer mind and a calmer nervous system, this study gives language and evidence to something we have been experiencing all along.

bottom line

The results of this meta-analysis are promising but preliminary.

Yoga appears to improve key cognitive functions: particularly attention, processing speed, and executive function. The acute effect size was larger than the chronic RCT effect, but this likely reflects the smaller number of acute studies and possible inflation from the memory finding (g = 0.78), rather than a genuine conclusion that one yoga session outperforms weeks of practice.

What this paper ultimately reveals is how much remains unknown: which style of yoga, at what dose, through which mechanism, for which population. Future research that standardises cognitive tests, isolates yoga components, and includes rigorous control groups will be needed before more definitive conclusions can be drawn.

—        Sophia Pacynko

Master’s Student, Psychology and Neuroscience of Mental Health, King’s College London

references

Aljasir, B., Bryson, M., & Al-shehri, B. (2010). Yoga Practice for the Management of Type II Diabetes Mellitus in Adults: A systematic review. Evidence-Based Complementary and Alternative Medicine : eCAM, 7(4), 399–408. https://doi.org/10.1093/ecam/nen027

Arnsten, A. F. T. (2009). Stress signalling pathways that impair prefrontal cortex structure and function. Nature Reviews Neuroscience, 10(6), 410–422. https://doi.org/10.1038/nrn2648

Gothe, N. P., & McAuley, E. (2015). Yoga and Cognition: A Meta-Analysis of Chronic and Acute Effects. Psychosomatic Medicine, 77(7), 784–797. https://doi.org/10.1097/PSY.0000000000000218

Lin, K.-Y., Hu, Y.-T., Chang, K.-J., Lin, H.-F., & Tsauo, J.-Y. (2011). Effects of yoga on psychological health, quality of life, and physical health of patients with cancer: A meta-analysis. Evidence-Based Complementary and Alternative Medicine: eCAM, 2011, 659876. https://doi.org/10.1155/2011/659876

Morone, N. E., & Greco, C. M. (2007). Mind-body interventions for chronic pain in older adults: A structured review. Pain Medicine, 8(4), 359–375. https://doi.org/10.1111/j.1526-4637.2007.00312.x

Nyer, M., Nauphal, M., Roberg, R., & Streeter, C. (2018). Applications of Yoga in Psychiatry: What We Know. Focus: Journal of Life Long Learning in Psychiatry, 16(1), 12–18. https://doi.org/10.1176/appi.focus.20170055

Posadzki, P., & Ernst, E. (2011). Yoga for low back pain: A systematic review of randomized clinical trials. Clinical Rheumatology, 30(9), 1257–1262. https://doi.org/10.1007/s10067-011-1764-8