Journey 2 · Awareness
Largest Brain-Scan Trials: Eight Weeks, No Structural Change
Small early studies reported gray-matter changes after eight weeks of mindfulness; the largest brain-scan trials, with 218 people, found no structural change.
In one small study, gray-matter concentration rose in the left hippocampus of 16 newcomers after an eight-week mindfulness course; in another, among 26 stressed adults, the more stress fell, the more gray-matter density fell in part of the amygdala. Kral and colleagues then ran two randomized trials with 218 newcomers, comparing the course with an active health program and a waitlist. They found no structural change compared with either group.
Here the larger, better-controlled test didn’t confirm the small early ones, so the headline that eight weeks of practice reshapes the brain remains unproven. That doesn’t settle what practice does for how you feel and respond. It means a few weeks of noticing practice hasn’t been shown to reshape the brain in ways a scan can see.
So Journey 2, Awareness, guided by Lemeki, asks you to practice for how it changes your responses, not for a picture of your brain. What would you want your practice to change about your next hard moment?
The research
Growing evidence Real research that's still building — results are promising and still being tested.
- Kral, T. R. A., Davis, K., Korponay, C., Hirshberg, M. J., Hoel, R., Tello, L. Y., Goldman, R. I., Rosenkranz, M. A., Lutz, A., & Davidson, R. J. (2022). Absence of structural brain changes from mindfulness-based stress reduction: Two combined randomized controlled trials. Science Advances, 8(20), eabk3316.
- Hölzel, B. K., Carmody, J., Vangel, M., Congleton, C., Yerramsetti, S. M., Gard, T., & Lazar, S. W. (2011). Mindfulness practice leads to increases in regional brain gray matter density. Psychiatry Research: Neuroimaging, 191(1), 36–43.
- Hölzel, B. K., Carmody, J., Evans, K. C., Hoge, E. A., Dusek, J. A., Morgan, L., Pitman, R. K., & Lazar, S. W. (2010). Stress reduction correlates with structural changes in the amygdala. Social Cognitive and Affective Neuroscience, 5(1), 11–17.
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