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| Home » Meditators have more grey matter, study finds: Practice found to thicken vital brain areas |
| Meditators have more grey matter, study finds: Practice found to thicken vital brain areas |
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Meditators have more grey matter, study finds: Practice found to thicken vital brain areas
National Post
Mon 14 Nov 2005
Page: A1 / Front
Section: News
Byline: Sharon Kirkey
Source: CanWest News Service
People who meditate have thicker brains, according to scientists who believe they have found the first structural evidence that meditation may increase grey matter.
Using magnetic resonance imaging, Boston researchers found that parts of the brain important for attention and sensory processing -- how we take in and make sense of things -- were thicker in meditators.
While all were extensively experienced in Buddhist insight meditation, "these are normal people with jobs and families" who meditated, on average, 40 minutes a day, said Dr. Jeremy Gray, assistant professor of psychology at Yale University and co-author of the study.
"You don't have to be a monk to see these changes in the actual structure of the brain."
The sample size was small -- just 35 people -- and so were the differences in brain thickness.
"It's not like they grew a new chunk of the brain," Dr. Gray said.
"These were not huge differences but they were statistically significant. The exciting part was that there was any difference at all."
Supported by the U.S. National Institutes of Health, the MIND Institute and the U.S. Centers for Disease Control and Prevention, the research is published in the journal NeuroReport. It was presented yesterday at the Society for Neuroscience meeting in Washington, D.C.
Earlier research has found that transcendental meditation lowers blood pressure and reduces cholesterol and hardening of the arteries. A study published in May in the American Journal of Cardiology found transcendental meditation reduces death rates by 23%.
People who meditate report less stress, and scientists have linked long-term stress to shrinking of the part of the brain involved in memory and learning.
By contrast, meditation might promote brain "plasticity" -- the ability to be moulded or shaped.
Studies, mostly in Buddhist monks, have found meditation changes brain activity as measured by an EEG.
The Boston scientists hypothesized that it might change the brain's actual physical structure, too.
Led by Dr. Sara Lazar, of the Psychiatric Neuroimaging Research Program at Massachusetts General Hospital, the researchers measured cortical thickness in 20 people trained in Buddhist insight meditation, a popular form of the mental exercise that does not use mantra or chanting but rather focuses on "mindfulness," being aware of sensations, feelings and state of mind.
The average age was 38, and people had, on average, nine years of meditation experience. Two were full-time meditation teachers.
They were matched by age, gender and education to 15 people who had never meditated or done yoga.
MRI studies found parts of the cerebral cortex, the outer layer of the brain, were thicker in those who meditated. The biggest difference was in the insula, a part of the brain that is "not so linked to higher cognition but more to emotion and internal perception of body state -- breathing, heart rate, emotions," Dr. Gray said.
Changes in breathing rate -- one of the effects of regular meditation is a significant drop in respiration rate -- were also related to thickness in one of the brain regions.
They also found evidence the mental exercise might slow age-related thinning of the frontal cortex.
"Our initial results suggest that meditation may be associated with structural changes in areas of the brain that are important for sensory, cognitive and emotional processing," the authors write in NeuroReport.
The findings need to be validated by more extensive studies. It's also possible that people with more cortical thickness are, for whatever reason, attracted to meditation to begin with.
What's more, the researchers didn't look at changes in the brain over time.
However, Dr. Gray said people who might otherwise be skeptical of meditation may now "be more open to doing a meditation or stress reduction workshop on their lunchtime."
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