Meditation Practice Alters Brain Networks in the Elderly
By John M. de Castro, Ph.D.
“A growing body of research supports the immediate benefits of meditation, such as reduced stress and anxiety levels, lower blood pressure, and enhanced happiness. Studies on mindfulness interventions show these effects are common in as few as eight weeks. While these initial perks may be reason enough for us to practice, meditation’s positive impact appears to be even more far-reaching, potentially adding years to our lives and improving cognitive function well into old age.” – Rina Deshpande
Human life is one of constant change. We revel in our increases in physical and mental capacities during development, but regret their decreases during aging. The aging process involves a systematic progressive decline in every system in the body, the brain included. This includes our mental abilities which decline with age including impairments in memory, attention, and problem solving ability. It is inevitable and cannot be avoided.
The nervous system is a dynamic entity, constantly changing and adapting to the environment. It will change size, activity, and connectivity in response to experience. These changes in the brain are called neuroplasticity. Over the last decade neuroscience has been studying the effects of contemplative practices on the brain and has identified neuroplastic changes in widespread area. and have found that meditation practice appears to mold and change the brain, producing psychological, physical, and spiritual benefits. In addition, they have been able to investigate various techniques that might slow the process of neurodegeneration that accompanies normal aging. They’ve found that mindfulness practices reduce the deterioration of the brain that occurs with aging restraining the loss of neural tissue. Indeed, the brains of practitioners of meditation and yoga have been found to degenerate less with aging than non-practitioners.
The changes in the aging brain produced by meditation are not a simple increases in tissue throughout the brain but rather increases in some area and systems and decreases in others. In today’s Research News article “A longitudinal study of the effect of short-term meditation training on functional network organization of the aging brain.” See summary below or view the full text of the study at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5428857/, Cotier and colleagues studied the neuroplastic changes in brain systems produced by meditation in the elderly. They recruited health elderly participants (average age of years) and randomly assigned them to receive either 8 weeks of meditation or relaxation training. Training occurred in 22 90-minute group classes. “Meditation participants were taught to cultivate mindfulness through paying attention to the surrounding sounds and one’s own breathing, feelings and sensations on the present moment.” “Relaxation participants were taught diaphragmatic breathing, progressive muscle relaxation and imagery relaxation techniques aimed at enhancing body awareness and reducing body tension.”
Before and after training the participants underwent functional Magnetic Resonance Imaging (fMRI) scanning of their brains. They found that after 8-weeks of meditation practice there was reduced functional connectivity in the default mode network (DMN), salience network (SN), and somatomotor network (SMN) while after relaxation training these same systems showed increased functional connectivity. Also, in the meditation group “there was decreased connectivity strength between the DMN and other modules.”
These are very interesting results as the Default Mode Network (DMN) becomes active during wind wandering and relatively quiet during focused on task behavior. It is involved when we are engaged in internally focused tasks such as recalling deeply personal memories, daydreaming, sleeping, imagining the future and trying to take the perspective of others. The DMN involves neural structures including the medial prefrontal cortex, anterior and posterior cingulate cortices, precuneus, inferior parietal cortex, and lateral temporal cortex. These areas of the DMN are functionally connected, such that they are simultaneously active during mind wandering.
Hence the current results of reduced functional connectivity in the DMN and between the DMN and other neural systems suggests that the meditation practice resulted in changes in the brain reflective of decreased mind wandering and increased focused attention. These changes can be helpful to the elderly who demonstrate increasing difficulties with attention. These changes may underlie the ability of meditation practice to reduce cognitive decline in the elderly. Hence, they suggest that meditation practice by the elderly can change their nervous systems in beneficial ways, decreasing the tendency for the mind to wander away from the task at hand and improving attentional ability and thereby reducing the deterioration of thought processes.
So, alter brain networks in the elderly with meditation practice.
“at a time when Americans are living longer than ever before but experiencing higher rates of Alzheimer’s and other neurodegenerative disorders, the research is an important reminder that mindfulness can exert a long-lasting influence on brain health.” – Carolyn Gregoire
CMCS – Center for Mindfulness and Contemplative Studies
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Study Summary
Cotier, F. A., Zhang, R., & Lee, T. M. C. (2017). A longitudinal study of the effect of short-term meditation training on functional network organization of the aging brain. Scientific Reports, 7, 598. http://doi.org/10.1038/s41598-017-00678-8
Abstract
The beneficial effects of meditation on preserving age-related changes in cognitive functioning are well established. Yet, the neural underpinnings of these positive effects have not been fully unveiled. This study employed a prospective longitudinal design, and graph-based analysis, to study how an eight-week meditation training vs. relaxation training shaped network configuration at global, intermediate, and local levels using graph theory in the elderly. At the intermediate level, meditation training lead to decreased intra-connectivity in the default mode network (DMN), salience network (SAN) and somatomotor network (SMN) modules post training. Also, there was decreased connectivity strength between the DMN and other modules. At a local level, meditation training lowered nodal strength in the left posterior cingulate gryus, bilateral paracentral lobule, and middle cingulate gyrus. According to previous literature, the direction of these changes is consistent with a movement towards a more self-detached viewpoint, as well as more efficient processing. Furthermore, our findings highlight the importance of considering brain network changes across organizational levels, as well as the pace at which these changes may occur. Overall, this study provides further support for short-term meditation as a potentially beneficial method of mental training for the elderly that warrants further investigation.
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