Project Soma: Cortical Activity of a Body Scan Meditation and Yoga Practice in Healthy Yogis

Overview

In this 2-armed randomized cross-sectional experimental study of healthy participants with yoga experience, we will examine the relationship between 4 self-reported enhancing psychological factors, cortical activity captured with functional near-infrared spectroscopy (fNIRS), and pain sensitivity (mechanical pressure pain tolerance) captured with algometry. Specifically, we will examine the correlates of interoceptive awareness and mindful awareness with cortical activity (Aim 1a) and pain tolerance (Aim 1b); determine cortical activity responsiveness of two brief awareness-focused meditations - a resting-based body scan practice and yoga practice (Aim 2a); characterize cortical activity profiles with sequentially delivered body scan and yoga practices (Aim 2b); and elucidate the relationship between interoceptive awareness with healthy emotionality and psychological wellbeing (Aim 3). Our central hypotheses are that (Aim 1a) higher interoceptive awareness and mindful awareness will moderately correlate with higher cortical activity for both awareness-focused meditation practices; (Aim 1b) individuals sub-grouped into the 'acceptance in action cluster' based on 2 self-report measures will exhibit higher pain tolerance; (Aim 2a) cortical activity will be higher in the yoga practice compared to the body scan practice; and (Aim 2b) higher cortical activity will be observed in the body scan-\>yoga intervention sequence compared to the yoga-\>body scan intervention sequence. Furthermore, (Aim 3) we predict that interoceptive awareness will moderately correlate with healthy emotionality and psychological well-being.

In Aim 1a, we will use self-report measures of interoception and awareness, using the Multidimensional Assessment of Interoceptive Awareness (MAIA) and the Five Facet Mindfulness Questionnaire - Short Form (FFMQ-SF), and fNIRS to capture cortical activity during brief exposures to resting (Body scan) and movement-based (yoga) practices. We predict that self-reported interoception and awareness will moderately, and directly correlate with prefrontal cortical activity during the Body Scan and Yoga practices. In other words, we expect that higher levels of self-reported interoception and awareness will be positively associated with higher levels of prefrontal cortical activity for both awareness-focused practices. In Aim 1b, we will use (i) the self-report measures (MAIA and FFMQ-SF) to identify a 'regulatory awareness' cluster and 'acceptance in action' cluster, and (ii) the quantitative sensory test of pressure pain tolerance. We will test the hypothesis that individuals categorized into the 'acceptance in action' cluster will demonstrate higher pressure pain threshold and tolerance compared to the 'regulatory awareness' cluster. In Aim 2, we will use cortical activity levels captured using fNIRS during two awareness-based practices - Body Scan and Yoga. We expect that cortical activity will be higher during Yoga compared to Body Scan (Aim 2a). We further expect that individuals who initially receive the resting-based meditation and then progress to receive the active-based meditation (Body Scan-\>Yoga) will at a group level demonstrate higher levels of cortical activity in comparison to individuals who receive Yoga-\>Body Scan (Aim 2b). In Aim 3, we will use self-report measures of interoception (MAIA) and self-report measures of healthy emotionality (Emotional Styles Questionnaire, ESQ) and psychological well-being (Scales of Psychological Well-Being, PWB). We predict that interoception will be moderately correlated with healthy emotionality and psychological well-being. Our contribution will be significant because elucidating cognitive and affective processes of awareness-based practices will help inform who may more favorably respond to different awareness-based practices aimed at cultivating well-being. Our proposed research is innovative because it seeks to advance a sensorimotor and psychological mechanistic understanding of meditation practices that will elucidate the 'active ingredients' responsible for its therapeutic effect.