Studies done by Yale, Harvard, Massachusetts General Hospital have
shown that meditation increases gray matter in specific regions of the
brain and may slow the deterioration of the brain as a part of the
natural aging process.
The experiment included 20 individuals with intensive Buddhist
"insight meditation" training and 15 who did not meditate. The brain
scan revealed that those who meditated have an increased thickness of
gray matter in parts of the brain that are responsible for attention and
processing sensory input. Some of the participants meditated for 40
minutes a day while others had been doing it for years. The results
showed that the change in brain thickness depended upon the amount of
time spent in meditation. The increase in thickness ranged between .004
and .008 inches (3.175 x 10−6m – 6.35 x 10 −6m).
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