The neurophysiological correlates of religious chanting

Electrodermal Activity Implicating a Sympathetic Nervous System Response under the Perception of Sensing a Divine Presence—A Psychophysiological Analysis

Previous studies have suggested that religious worship experiences may recruit the autonomic nervous system (ANS) in an activating fashion. For this reason, we hypothesized that measurements of the electrodermal activity (EDA) would concur with the notion that the subjective experience of sensing the presence of God recruits a sympathetic nervous system response. We analyzed the EDA of 37 evangelical participants and calculated classic galvanic skin response (GSR) measures. Our experimental design included six conditions with and without music consisting of religious and non-religious songs plus a resting-state condition, which were used to induce a variance in the religious experience suitable for statistical analyses. Results showed that both tonic and phasic signals as well as the overall electrical skin conductance (SC) were positively associated with the religious experience, defined as sensing the presence of God. This implicates that we can accept the hypothesis that such a religious experience under the influence of worship seems to recruit the sympathetic nervous system.

Analysis of Meditation vs. Sensory Engaged Brain States Using Shannon Entropy and Pearson's First Skewness Coefficient Extracted from EEG Data

It has been proposed that meditative states show different brain dynamics than other more engaged states. It is known that when people sit with closed eyes instead of open eyes, they have different brain dynamics, which may be associated with a combination of deprived sensory input and more relaxed inner psychophysiological and cognitive states. Here, we study such states based on a previously established experimental methodology, with the aid of an electro-encephalography (EEG) array with 128 electrodes. We derived the Shannon Entropy (H) and Pearson's 1st Skewness Coefficient (PSk) from the power spectrum for the modalities of meditation and video watching, including 20 participants, 11 meditators and 9 non-meditators. The discriminating performance of the indices H and PSk was evaluated using Student's t-test. The results demonstrate a statistically significant difference between the mean H and PSk values during meditation and video watch modes. We show that the H index is useful to discriminate between Meditator and Non-Meditator participants during meditation over both the prefrontal and occipital areas, while the PSk index is useful to discriminate Meditators from Non-Meditators based on the prefrontal areas for both meditation and video modes. Moreover, we observe episodes of anti-correlation between the prefrontal and occipital areas during meditation, while there is no evidence for such anticorrelation periods during video watching. We outline directions of future studies incorporating further statistical indices for the characterization of brain states.

Immediate Effects of OM Chanting on Heart Rate Variability Measures Compared Between Experienced and Inexperienced Yoga Practitioners

Background

Chanting "OM" is a form of meditation that has numerous health benefits. However, the neurophysiological mechanisms underpinning its effect are surprisingly scarce. The present study aimed to investigate the effect of OM chanting on autonomic modulation, using heart rate variability (HRV), on experienced yoga practitioners and yoga naïve persons.

Methods

This prospective study included 19 yoga practitioners (9 females and 10 males; group mean age ± standard deviation [SD]; 25.9 ± 3.2 years) and 17 yoga naïve persons (8 females and 9 males; group mean age ± SD; 24.8 ± 3.6 years) of both sexes and similar age range. Both the groups were assessed for HRV indices (time and frequency domain measures) before and after loud OM chanting for 5 min.

Results

Baseline comparison using Mann-Whitney U test between groups showed yoga practitioners had significantly increased high frequency (HF) power (P < 0.029) than nonyoga practitioners, signifying a state of tranquility before the chanting of OM. After 5 min of loud chanting of OM, a comparison between groups assessed using Wilcoxon Signed Ranks test revealed: HF Power, a component of the parasympathetic nervous system, was further amplified with a significantly increase (P < 0.001) in the yoga practitioners group compared to nonyoga practitioners. Furthermore, this increase in HF power was positively correlated with the years of experience in yoga.

Conclusion

The present study showed that a brief chanting of OM (5 min) might enhance parasympathetic nervous system activity, promote relaxation, and provide calmness. Further, this experience may be achieved effectively in individuals experienced in yoga than nonyoga practitioners.

Mindfulness practice during COVID-19 crisis: Implications for confinement, physical inactivity, and sedentarism

COVID-19 pandemic has radically impacted and altered the lives of billions of people around the world. Due to strict government policies, most individuals now find themselves confined at home with limited movement permissible. Although these measures are enforced to help abate the rate of infection, such restrictions have huge implications for the psychophysiological health, lifestyle, and overall well-being of individuals. The COVID-19 confined circumstances, coupled with the gradually declining levels of physical activity and rising levels of sedentarism that is prevalent in the modern society, can have deleterious effect on the psychological, physical, and social health of individuals. This paper argues for essential alternative measures to be introduced that would not only assuage the detrimental effects of COVID-19 confinement, physical inactivity, and sedentarism in the short-term, but also promote psychophysiological health and well-being in the long-term. In particular, this paper recommends the practice of mindfulness as a viable option under the current circumstances. This paper further outlines the health benefits of mindfulness practice and illustrates two effective and efficient practices — mindful breathing and mantram chanting — that could be suitably utilized under the current altered and confined COVID-19 arrangement by individuals across the life span. Potential benefits, recommendations, and risks have also been addressed.

Repetitive Religious Chanting Invokes Positive Emotional Schema to Counterbalance Fear: A Multi-Modal Functional and Structural MRI Study

Introduction

During hard times, religious chanting/praying is widely practiced to cope with negative or stressful emotions. While the underlying neural mechanism has not been investigated to a sufficient extent. A previous event-related potential study showed that religious chanting could significantly diminish the late-positive potential induced by negative stimuli. However, the regulatory role of subcortical brain regions, especially the amygdala, in this process remains unclear. This multi-modal MRI study aimed to further clarify the neural mechanism underlying the effectiveness of religious chanting for emotion regulation.

Methodology

Twenty-one participants were recruited for a multi-modal MRI study. Their age range was 40–52 years, 11 were female and all participants had at least 1 year of experience in religious chanting. The participants were asked to view neutral/fearful pictures while practicing religious chanting (i.e., chanting the name of Buddha Amitābha), non-religious chanting (i.e., chanting the name of Santa Claus), or no chanting. A 3.0 T Philips MRI scanner was used to collect the data and SPM12 was used to analyze the imaging data. Voxel-based morphometry (VBM) was used to explore the potential hemispheric asymmetries in practitioners.

Results

Compared to non-religious chanting and no chanting, higher brain activity was observed in several brain regions when participants performed religious chanting while viewing fearful images. These brain regions included the fusiform gyrus, left parietal lobule, and prefrontal cortex, as well as subcortical regions such as the amygdala, thalamus, and midbrain. Importantly, significantly more activity was observed in the left than in the right amygdala during religious chanting. VBM showed hemispheric asymmetries, mainly in the thalamus, putamen, hippocampus, amygdala, and cerebellum; areas related to skill learning and biased memory formation.

Conclusion

This preliminary study showed that repetitive religious chanting may induce strong brain activity, especially in response to stimuli with negative valence. Practicing religious chanting may structurally lateralize a network of brain areas involved in biased memory formation. These functional and structural results suggest that religious chanting helps to form a positive schema to counterbalance negative emotions. Future randomized control studies are necessary to confirm the neural mechanism related to religious chanting in coping with stress and negative emotions.

Neurophysiological correlates of religious coping to stress: a preliminary EEG power spectra investigation

Religious coping to psychological stress has been linked to positive outcomes on both physical and mental health, but no studies have explored its neurophysiological correlates. Ninety-six participants (43 men and 53 women, mean age: 22.30 ± 2.48 years) were enrolled in the present study; they underwent an evaluation of coping with the brief version of the Coping Orientation to Problems Experienced (brief-COPE) scale and performed an eyes-closed resting state electroencephalographic (EEG) recording. EEG analyses were conducted with the exact Low-Resolution Electromagnetic Tomography software (eLORETA). Positive correlations between religious coping and EEG activity were observed in the theta frequency band in the right hemisphere, specifically in the superior temporal, inferior frontal, and middle temporal gyri. Religious coping scores were significantly positively associated with active coping and positive reframing coping strategies, with the latter not being significantly associated with EEG data. Taken together our results contribute to increase the knowledge on the neurophysiological concomitants of religious coping to stress.

Review article: the role of the autonomic nervous system in the pathogenesis and therapy of IBD

BACKGROUND

There is a growing body of evidence implicating a role for the brain-gut axis in the pathogenesis of inflammation in patients with IBD.

AIMS

To perform a narrative review of published literature regarding the association of the autonomic nervous system and intestinal inflammation and to describe the rationale for and emerging use of autonomic manipulation as a therapeutic agent METHODS: Current relevant literature was summarised and critically examined.

RESULTS

There is substantial pre-clinical and clinical evidence for a multifaceted anti-inflammatory effect of the vagus at both systemic and local intestinal levels. It acts via acetylcholine-mediated activation of α-7-acetylcholine receptors involving multiple cell types in innate and adaptive immunity and the enteric nervous system with subsequent protective influences on the intestinal barrier, inflammatory mechanisms and the microbiome. In patients with IBD, there is evidence for a sympatho-vagal imbalance, functional enteric neuronal depletion and hyporeactivity of the hypothalamic-pituitary-adrenal axis. Direct or transcutaneous vagal neuromodulation up-regulates the cholinergic anti-inflammatory pathway in pre-clinical and clinical models with down-regulation of systemic and local intestinal inflammation. This is supported by two small studies in Crohn's disease although remains to be investigated in ulcerative colitis.

CONCLUSIONS

Modulating the cholinergic anti-inflammatory pathway influences inflammation both systemically and at a local intestinal level. It represents a potentially underutilised anti-inflammatory therapeutic strategy. Given the likely pathogenic role of the autonomic nervous system in patients with IBD, vagal neuromodulation, an apparently safe and successful means of increasing vagal tone, warrants further clinical exploration.