By John M. de Castro, Ph.D.
“Yet until recently little was known about how a few hours of quiet reflection each week could lead to such an intriguing range of mental and physical effects. Now, as the popularity of mindfulness grows, brain imaging techniques are revealing that this ancient practice can profoundly change the way different regions of the brain communicate with each other – and therefore how we think – permanently.” – Tom Ireland
Meditation training has been shown to alter the nervous system, increasing the size and connectivity of structures associated with present moment awareness, higher level thinking, and regulation of emotions, while decreasing the size and connectivity of structures associated with mind wandering and self-referential thinking, known as the Default Mode Network (DMN). The brain is capable of changing and adapting in a process called neuroplasticity. As a result, the neural changes produced by meditation training become relatively permanent.
Meditation training has also been shown to produce improvements in emotion regulation. Most of the research to date on the neural systems altered by meditation training has focused on higher level cortical centers. But, emotions involve lower centers such as those located in the Pons in primitive brain stem. In today’s Research News article “Pons to Posterior Cingulate Functional Projections Predict Affective Processing Changes in the Elderly Following Eight Weeks of Meditation Training.” See:
or see summary below or view the full text of the study at:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5006446/
Shao and colleagues investigate the changes in connectivity between the Pons sites involved in emotions and the Posterior Cingulate Cortex and the Precuneus area which are important in the Default Mode Network (DMN). They recruited elderly (>60 years of age) participants with no experience with meditation or relaxation training through newspaper ads. They were randomly assigned to receive 8-weeks of either meditation training or relaxation training. Training occurred with 1.5-hour training sessions occurring 3 time per week. All participants received functional Magnetic Resonance Imaging (fMRI) brain scans and were tested with an emotion processing task both before and after training.
They found that after meditation training the elderly participants had moderated emotional responses that converged toward the middle, such that positive emotions were not as positive and arousing while negative emotions were not as negative and arousing as prior to training. This effect did not occur in the relaxation trained participants. They also found increased functional connectivity between the Pons emotion centers and the Posterior Cingulate Cortex and the Precuneus area components of the Default Mode Network (DMN). The increased connectivity was primarily in the Pons to DMN direction. In addition, the greater the change in the connectivity the greater the reduction in negative emotional responses by the participants. Again, these effect did not occur in the relaxation trained participants.
These are interesting results that extend the previous findings on improved emotion regulation after meditation training as the training was found to moderate emotional reactivity, making both positive and negative emotions less extreme. They further showed that this moderation of emotions is associated with increased connectivity between the areas of primitive emotion in the Pontine brain stem and the higher level Default Mode Network (DMN) procession in the Cerebral Cortex. These effects were shown to be due to the meditation training as relaxation training did not produce them.
One of the ways that emotions can get out of hand is by ruminating about past emotional responses and worrying about future emotional responses. This can increase the magnitude of emotional responses. Rumination and worry is the role of the DMN. The present research suggests that the improve emotion regulation seen after meditation training may be due to the increased influence of lower emotion centers on reducing the activation of the brain areas responsible for rumination and worry. In that way emotions can be experienced and analyzed as real time experiences and not amplified beyond their actual magnitude. This is a tremendous benefit of meditation training, allowing for more realistic appraisal of emotions.
So, improve brain processing of emotions in the elderly with meditation.
“One way to do this is mindfulness meditation, in which you observe your thoughts and feelings with the objectivity of a disinterested, nonjudgmental witness. This form of mental training gives you “the wherewithal to pause, observe how easily the mind can exaggerate the severity of a setback, note that it as an interesting mental process, and resist getting drawn into the abyss,” – Richie Davidson
CMCS – Center for Mindfulness and Contemplative Studies
This and other Contemplative Studies posts are also available on Google+ https://plus.google.com/106784388191201299496/posts
Study Summary
Robin Shao, Kati Keuper, Xiujuan Geng, Tatia M.C. Lee. Pons to Posterior Cingulate Functional Projections Predict Affective Processing Changes in the Elderly Following Eight Weeks of Meditation Training. EBioMedicine. 2016 Aug; 10: 236–248. Published online 2016 Jun 15. doi: 10.1016/j.ebiom.2016.06.018
Abstract
Evidence indicates meditation facilitates affective regulation and reduces negative affect. It also influences resting-state functional connectivity between affective networks and the posterior cingulate (PCC)/precuneus, regions critically implicated in self-referential processing. However, no longitudinal study employing active control group has examined the effect of meditation training on affective processing, PCC/precuneus connectivity, and their association. Here, we report that eight-week meditation, but not relaxation, training ‘neutralized’ affective processing of positive and negative stimuli in healthy elderly participants. Additionally, meditation versus relaxation training increased the positive connectivity between the PCC/precuneus and the pons, the direction of which was largely directed from the pons to the PCC/precuneus, as revealed by dynamic causal modeling. Further, changes in connectivity between the PCC/precuneus and pons predicted changes in affective processing after meditation training. These findings indicate meditation promotes self-referential affective regulation based on increased regulatory influence of the pons on PCC/precuneus, which new affective-processing strategy is employed across both resting state and when evaluating affective stimuli. Such insights have clinical implications on interventions on elderly individuals with affective disorders.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5006446/