[Neurosciences] Low and then high frequency oscillations of distinct right cortical networks are progressively enhanced by medium and long term Satyananda Yoga meditation practice

par **Hagel** Mer 22 Oct 2014 - 21:12

Bonjour,

"Low and then high frequency oscillations of distinct right cortical networks are progressively enhanced by medium and long term Satyananda Yoga meditation practice"

L'étude portait sur les effets de la méditation du yoga Satyananda, à moyen (4 ans de pratique) et long terme (30 ans de pratique). On connait les effets de la méditation bouddhiste sur le cerveau, ils voulaient tester sur d'autres approches spirituelles les résultats selon des éléments prédéterminés. Ils ont testé sur la pratique de l'ancrage, de la récitation de mantra, et l'usage simple de calcul mental, par ECG (mesure des ondes du cerveau).
Une plus grande facilité à mobiliser des ondes alpha et thêta ont été noté chez les pratiquants moyens. Les pratiquants de long termes mobilisaient les ondes bêtas et gammas au quotidien et encore plus en méditation. Ainsi, les acquis de la méditation s'étendaient bien au delà de la simple pratique, mais aussi dans l'amélioration de la circulation des échanges neuronaux entre les deux hémisphères du cerveau )(neuroplasticité).

Par John Thomas 1, Graham Jamieson 2, and Marc Cohen 1
1 School of Health Sciences, RMIT University, Bundoora, VIC, Australia
2 School of Behavioural, Cognitive and Social Sciences, University of New England, Armidale, NSW, Australia

Publiée le 10 juin 2014

Meditation proficiency is related to trait-like (learned) effects on brain function, developed over time. Previous studies show increases in EEG power in lower frequency bands (theta, alpha) in experienced meditators in both meditation states and baseline conditions. Higher gamma band power has been found in advanced Buddhist meditators, yet it is not known if this occurs in Yoga meditation practices. This study used eLORETA to compare differences in cortical source activity underlying scalp EEG from intermediate (mean experience 4 years) and advanced (mean experience 30 years) Australian meditators from the Satyananda Yoga tradition during a body-steadiness meditation, mantra meditation, and non-meditation mental calculation condition. Intermediate Yoga meditators showed greater source activity in low frequencies (particularly theta and alpha1) during mental calculation, body-steadiness and mantra meditation. A similar spatial pattern of significant differences was found in all conditions but the number of significant voxels was double during body-steadiness and mantra meditation than in the non-meditation (calculation) condition. These differences were greatest in right (R) superior frontal and R precentral gyri and extended back to include the R parietal and occipital lobes. Advanced Yoga meditators showed greater activity in high frequencies (beta and especially gamma) in all conditions but greatly expanded during meditation practice. Across all conditions (meditation and non-meditation) differences were greatest in the same regions: R insula, R inferior frontal gyrus and R anterior temporal lobe. Distinct R core networks were identified in alpha1 (8–10 Hz) and gamma (25–42 Hz) bands, respectively. The voxels recruited to these networks greatly expanded during meditation practice to include homologous regions of the left hemisphere. Functional interpretation parallels traditionally described stages of development in Yoga proficiency.

L'intégralité de l'étude :

Frontiers in human neuroscience

bien à vous, Hagel