Increased Gamma Brainwave Amplitude Compared to Control in Three Different Meditation Traditions.

PLoS One · 2017 · PMC5261734 · PMID 28118405

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showed a trendno p-value reported

Comparisons between instructed mind-wandering periods across groups also showed a trend towards increased high gamma power over parieto-occipital electrodes in the meditator groups.

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failed to reach significanceno p-value reported

High-gamma 60 to 110 Hz power effect was found during meditation in the three meditator groups compared to the control group but failed to reach significance when assessing the instructed mind-wandering state activity across or within groups.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.