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.

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Background: Psychophysiological coherence has been widely studied as a bodily state associated with general well-being and cognitive clarity. Heart Rate Variability (HRV) has been shown to be a good biomarker to assess psychophysiological coherence. This paper presents the first general set of results concerning a study that is part of a team effort between a body of researchers in 5 countries led by the HeartMath Institute under the name, International Heart Rate Variability Synchronization (IHRVS) Study. This study focuses on the effects that meditation has on both HRV and the Coherence Ratio. It is hypothesized that meditation improves coherence. Methods: Our research study was conducted at The Embassy of Peace in Whitianga, New Zealand with 22 participants, whose cardiac activity was measured via a FIRSTBEAT wireless HRV recorder, for a period of 15 days, 23 hours per day, plus an hour break per day for individual care of the body. In order to have an initial qualitative impression of the data, we