Effects of Meditation on Structural Changes of the Brain in Patients With Mild Cognitive Impairment or Alzheimer’s Disease Dementia

• Main Authors: Banerjee, R. (Author), Bapi, R.S (Author), Basu, J. (Author), Das, M. (Author), Dubey, N. (Author), Dwivedi, M. (Author), Ghosh, A. (Author), Guha, M. (Author), Pansari, A.J (Author), Pramanick, G. (Author)
• Format: Article
• Language: English
• Published: Frontiers Media S.A. 2021
• Subjects: aged; Alzheimer disease; Alzheimer’s disease; Article; caudal middle frontal cortexc; cingulate gyrus; clinical article; clinical assessment; controlled study; cortical thickness; cortical thickness (brain); dentate gyrus molecular layer; female; gray matter volume; hippocampal CA1 region; hippocampal CA3 region; human; imaging; lateral occipital cortex; lateral orbitofrontal cortex; left hemisphere; left rostral middle frontal cortex; male; medial frontal cortex; medial orbitofrontal cortex; meditation; mild cognitive impairment; neuroimaging; neuropsychology; nuclear magnetic resonance imaging; paracentral cortex; psychologic assessment; right hemisphere; superior frontal cortex; superior frontal gyrus; superior parietal lobule; superior temporal sulcus; thalamus; treatment duration
• Online Access: View Fulltext in Publisher

 Previous cross-sectional studies reported positive effects of meditation on the brain areas related to attention and executive function in the healthy elderly population. Effects of long-term regular meditation in persons with mild cognitive impairment (MCI) and Alzheimer’s disease dementia (AD) have rarely been studied. In this study, we explored changes in cortical thickness and gray matter volume in meditation-naïve persons with MCI or mild AD after long-term meditation intervention. MCI or mild AD patients underwent detailed clinical and neuropsychological assessment and were assigned into meditation or non-meditation groups. High resolution T1-weighted magnetic resonance images (MRI) were acquired at baseline and after 6 months. Longitudinal symmetrized percentage changes (SPC) in cortical thickness and gray matter volume were estimated. Left caudal middle frontal, left rostral middle frontal, left superior parietal, right lateral orbitofrontal, and right superior frontal cortices showed changes in both cortical thickness and gray matter volume; the left paracentral cortex showed changes in cortical thickness; the left lateral occipital, left superior frontal, left banks of the superior temporal sulcus (bankssts), and left medial orbitofrontal cortices showed changes in gray matter volume. All these areas exhibited significantly higher SPC values in meditators as compared to non-meditators. Conversely, the left lateral occipital, and right posterior cingulate cortices showed significantly lower SPC values for cortical thickness in the meditators. In hippocampal subfields analysis, we observed significantly higher SPC in gray matter volume of the left CA1, molecular layer HP, and CA3 with a trend for increased gray matter volume in most other areas. No significant changes were found for the hippocampal subfields in the right hemisphere. Analysis of the subcortical structures revealed significantly increased volume in the right thalamus in the meditation group. The results of the study point out that long-term meditation practice in persons with MCI or mild AD leads to salutary changes in cortical thickness and gray matter volumes. Most of these changes were observed in the brain areas related to executive control and memory that are prominently at risk in neurodegenerative diseases. Copyright © 2021 Dwivedi, Dubey, Pansari, Bapi, Das, Guha, Banerjee, Pramanick, Basu and Ghosh.