Mindfulness as attention training

The short version

Paul Verhaeghen asked whether mindfulness really trains attention, using three separate meta-analyses that came at the question from different angles: training studies, long-term meditators and everyday mindfulness as a personality trait. All three pointed the same way. Mindfulness training was linked to reliable, modest improvements in objectively measured attention, the gains came from focused-attention practice, and more sessions meant better performance.

What the researchers did

The paper combines three meta-analyses, all using objective attention tasks rather than questionnaires about attention:

1. Interventions: mindfulness training versus a control treatment — 109 effect sizes from 40 studies.
2. Long-term practice: experienced meditators compared with people who had never meditated — 59 effect sizes from 18 studies.
3. Trait mindfulness: correlations between self-reported everyday mindfulness and attention performance — 197 effect sizes from 28 studies.

Results were broken down by type of attention: inhibition and executive control, updating information in working memory, shifting between tasks, and sustained attention.

What they found

• Interventions: an average effect of g = 0.29 on attention performance.
• Long-term meditators: g = 0.32 compared with non-meditators.
• Trait mindfulness: a small correlation with attention, r = 0.12.
• Inhibition and executive control improved in all three analyses; updating and sustained attention in two of the three.
• Effects were larger on accuracy than on speed.
• Focused-attention interventions — holding attention on one object, such as the breath — produced significant effects; adding a yoga component reduced them.
• More sessions were associated with better attention performance.

Limits and caveats

The long-term meditator and trait comparisons are correlational: people who choose to meditate for years, or who are naturally mindful, may differ in other ways. Only the intervention analysis comes from randomized studies, and 40 studies is a moderate base. The effects are modest, in line with other reviews such as the 111-trial meta-analysis.

What it means for how you work

If you try meditation to improve focus, pick a focused-attention style — return attention to one anchor each time it wanders — rather than a mixed movement practice, and plan for repetition. The dose-response finding suggests consistency over many sessions matters more than any single long one. Expect fewer slips rather than faster work.