I found this excerpt about an article dealing with the interactions of the right and left side of the brain on The Buddhist Blog:
Enlightenment has been described in many ways, but what is common to most descriptions of enlightenment is a change in the sense of ‘self,’ and a sensation of a release from suffering. An enlightened person is said to no longer identify with herself as the individual she once was. She is also said to no longer experience negative thoughts.
Our feeling part of our Self is located in the limbic system, in this case the amygdala. In most people, the left side feels pleasure or positive emotions, and the right side experiences negative emotions. In each case, the right (positive) and left (negative) components are synaptically ‘wired’ to each other. Thoughts and emotions are communicated back and forth between both sides of the the brain along the synapses. Now here is where meditation impacts these processes. Most meditative practices involve techniques to de-emphasize, defuse or reduce negative thoughts. Over the long term, what this means in the brain is that the transmission of electrical impulses into both the right side (negative) of both the amygdala and hippocampus is reduced. Fewer negative feelings and thoughts, less activity along those pathways.
Published studies support the idea that long term meditation works by ‘starving’ the brain of negative emotions and expectations. So meditation not only trains us not to respond as intensely and frequently to negative thoughts and emotions, it also causes an ‘atrophying’ of our brain’s ability to process those thoughts and emotions. But the caveat here, is that it takes a lot of consistent practice over the long term.
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