Scientific American Just put out a decent summary of the current neuroscience research on meditation written by friends, Matthieu Ricard, Antoine Lutz, and Richie Davidson. I enjoyed reading the article and thought I’d share it here with some commentary. The article uses the same distinctions in meditation practice we outlined in our S-ART paper – That is Focused Attention, Open Monitoring (or Mindfulness), and Loving Kindness or Compassion (or ethical enhancement practices).
Essentially, they describe the act of meditating during Focused Attention similarly to the model below – A practitioner starts with the intention, orients attention and engages on object (Breath) – the mind becomes distracted and enters the mind-wandering default mode network – it realizes there is distraction (through decentering) and activates a salience network. Reorientation of awarenesss than involves dorsolateral prefrontal cortex and anterior inferior parietal lobe. I would further argue that the larger frontoparietal control network (including nodes of the salience network and lateral frontopolar cortex and even the lateral cerebellum) all contribute to the decentering, monitoring, and reorientation process. the ventrolateral prefrontal cortex concurrently helps with response inhibition.
Interestingly, the article also points out some of the morphological changes noted in a recent meta-analyses done by Kiran Fox HERE. The study found the frontopolar cortex and anterior insula were 2 brain regions with neuroplastic changes most often found in such studies of meditators.
How does yoga work? Is there a benefit to doing a bunch of postures, breathing, and meditation techniques while being crammed in a room full of Lululemon Athletica? A group of interdisciplinary researchers gathered at Kripalu Yoga center to discuss the potential mechanisms associated with yoga practice in contemporary settings, while also acknowledging the traditional, historical framework of ethically-motivated practices.
The manuscript (LINK) specifically poses a novel theoretical model of the potential self-regulatory mechanisms by which yoga facilitates adaptive reactions to physical and mental stress.
To give you a sense of what this model is depicting, I summarize below:
This systems network model includes the major limbs of yoga, represented as a skillset of four process tools: ethics, meditation, breath regulation, and sustained postures. As depicted in the model, cognitive, emotional, behavioral, and autonomic output in response to a stressor is modulated by a number of regulatory processes (yellow boxes) proposed to be influenced by the process tools (limbs of yoga, blue boxes). A stress response is often accompanied by cognitive, emotional, and behavioral output that includes emotional reactivity, negative appraisal, and rumination. In addition, autonomic output such as vasoconstriction, pain and/or tension, and inflammation often accompany maladaptive stress responses; (see solid black arrows). In chronic forms of such stress responses, negative, long-term consequences on health across bodily systems are often the result.
Our model proposes that yoga facilitates adaptive output (dotted lines), including long-term psychological and physical well-being, musculoskeletal strengthening, and prosocial behavior, through four primary factors in the context of stress: (1) an emphasis on interoception (body awareness) and bottom-up input (processing of information coming from the external and internal senses), (2) more efficient bidirectional feedback and integration with top-down (cognitive) processes, (3) increased phasic inhibition (red lines) of maladaptive forms of emotional, cognitive, and behavioral output (e.g., reactivity, negative appraisal, rumination) as well as autonomic output (e.g., vaso- and pulmonary constriction, inflammation, and muscle tension/pain), and (4) perceptual inference (using perceptual information from the body) rather than active inference (cognitive processing) for improved prediction (of the world) and Error Correction (less bias from previous mental habits). These four factors optimize self-regulation and improve the communication and flexibility by which top-down and bottom-up processes inform behavioral output in the context of physical and emotional stress. Through repeated yoga practice, there is a resulting skillful optimization of autonomic control in response to stressors on and off the yoga mat – keeping arousal at lower levels during stress-mediated challenge, maintaining positive appraisal and reinforcement, helping the practitioner stay relaxed with less effort, and facilitating rapid recovery of bodily systems under stress. A number of cognitive, emotional, behavioral, and autonomic mechanisms are proposed along with the underlying high- and low-level brain networks that support such mechanisms.
The takehome point: Yoga facilitates improved stress response modulation on and off the mat.