Saying that meditation changes the brain sounds like too large a claim, and it is hard to test without measuring something directly. In one small trial, adults under stress were assigned at random either to three days of mindfulness training or to three days of relaxation. What separated the two?
Scans before and after found a shift in the connection between a region of the and one in the prefrontal cortex, larger in the mindfulness group than in the relaxation group. That shift was also linked statistically to a drop in a blood marker of inflammation measured months later.
The question a study like this tries to settle is not whether meditation is calming, but whether it can be measured in something other than self-report. Self-report is exposed on every side: people who chose to meditate expect it to work, and they are the ones answering.
So the study measured instead. Rather than asking how people felt, it asked whether the synchrony between the mind-wandering network and control regions at the front of the brain had shifted. And whether it shifted more in the mindfulness group than in relaxation.
The second layer is the more interesting one. That same shift was linked statistically to a drop in an in the blood, tested months later. It is an attempt to tie a brain measurement to something in the body, which is the step most claims of this kind never take.
And this is exactly where to hold back. Thirty-five participants over three days is , the inflammation marker is non-specific and rises for many reasons, and a statistical link is not a mechanism. What the study earns is a larger one, not a recommendation.
wat. After three days of training, the link between two brain networks had shifted more than it did after three days of relaxation.
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It shows how a mental practice can be examined through a physiological measurement, instead of resting on what people say they felt.
How do we know?
The study randomly assigned thirty-five adults to two groups, scanned them before and after, and compared the change in resting-state connectivity.
What is still unknown
Small and short. A shift in connectivity or an inflammation marker does not show that the practice prevents illness or improves health in any given person.
Learn something?
Where to next
Meditation against chronic pain: real relief or an overstated promise?mindfulness
Does compassion meditation make people more generous?meditation
Why is it so much harder to show mindfulness helps when you compare it with another real treatment?mindfulness