Neural Correlates of Chanting: A Systematic Review.

Résumé

Chanting is an ancient and globally widespread ritualistic practice involving rhythmic vocalization or repetition of words, phrases, or sounds. While previous reviews have considered the neurophysiological impact of meditation and spirituality, chanting has received limited systematic investigation. This review aimed to identify and synthesize neural correlates of chanting, examine methodological variability, and determine consistent neural patterns across chanting studies and styles. PsycINFO and PubMed databases were systematically searched for neuroimaging studies including chanting, mantra, and repetitive prayer. Articles published through October 8, 2024, were included, yielding 899 initial articles. After applying exclusion criteria, 24 studies were included. Study quality was assessed using the adapted Effective Public Health Practice Project (EPHPP) criteria. Findings demonstrate that chanting activates brain regions involved in attention and emotional regulation, including the prefrontal cortex, insula, and cingulate gyrus. Deactivation of default mode network (DMN) areas, particularly the posterior cingulate cortex and hippocampus, was also observed, suggesting reduced self-referential thought. Electroencephalography (EEG) studies revealed increased theta activity, indicating enhanced relaxation during chanting. Although heterogeneity in sample sizes, imaging modalities, participant characteristics, and control conditions preclude a formal meta-analysis, the findings lay a foundation for advancing research into the neural mechanisms of chanting. Chanting engages neural networks associated with attention and emotional regulation. The consistent pattern of prefrontal activation and DMN deactivation suggests mechanisms similar to other contemplative practices.