| Reference code: | PT/FB/BL-2006-044.09 |
| Location: | Arquivo PCA - Pasta 19/2006
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Title:
| Scalp EEG connectivity and intracerebral electrical connectivity (sLORETA lagged coherence) during resting and five meditation traditions
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| Publication year: | 2009
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URL:
| http://www.med.uni-giessen.de/physio/Kognitive_Neurophysiologie_2009_2_1.pdf
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| Abstract/Results: | ABSTRACT:
Brain electric functional connectivity was studied in experienced meditators of five traditions (13 Tibetan Buddhists ’TB’, 15 QiGong ’QG’, 14 Sahaja Yoga ’SY’, 14 Ananda Marga Yoga ’AY’, 15 Soto Zen ’Zen’) during tradition specific meditation (self-dissolution, QiGong, Samadhi, Satori) and during wakeful resting before (’rest1’) and after (’rest2’) meditation. EEG (19-56 electrodes) was computed (via sLORETA, current density in 6239 voxels) into intracerebral waveshapes of 19 intracerebral regions (ROIs) that correspond to cortex underlying the 10/20 electrode positions. Functional connectivity was computed from scalp-recorded data as conventional coherence between 19 locations, and from sLORETA waveshapes as ’lagged coherence’ between 19 ROI’s; lagged coherence only measures connections with time delay; these are interpretable as true functional connectivity. - For each meditator group, t tests identified significant coherence differences between rest1 vs meditation and rest2 vs meditation in each of 8 EEG frequency bands (delta to gamma). Between 19 locations or ROIs, there are 171 connections. For each subject and frequency band, the percentage of connections were counted that reached significant different coherence between rest1 vs meditation and rest2 vs meditation; from these two values, mean was computed, and averaged across all 8 bands for each tradition separately. For scalp coherences, in the 5 traditions, between 1% to 4% of the connections were significant higher in meditation than rest, between 6% to 36% lower; for intracerebral lagged coherence, 0% were higher, between 26% to 68% were lower. On average across the 5 traditions, scalp coherence decreased most strongly in alpha1&2 and beta1&2, while intracerebral lagged coherence decreased most strongly in delta, theta, beta1&2. For the gamma frequency band alone, scalp coherences were higher between 1% to 13%, lower between 1% to 27%; intracerebral lagged coherences were higher in 0%, lower between 2% to 75% of cases. In sum, all 5 traditions clearly showed more significant decreases than increases in scalp coherence, and only significant decreases, no increases in intracerebral lagged coherence that avoids distorting volume conduction. Contrary to published reports of strongly increased gamma band coherence in meditation, our 5 traditions on average in scalp coherence increased significantly only 4% of the gamma band coherences while 9% decreased; in intracerebral lagged coherence none increased but 44% decreased. (Partial support by Bial Grant No. 44 2006/2007).
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| Accessibility: | Document exists in file (poster)
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Copyright/Reproduction:
| By permission
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Language:
| eng
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Notes:
| Abstract and respective poster in attachment |
| Author: | Faber, P.
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Secondary author(s):
| Tei, S., Pascual-Marqui, R., Gianotti, L., Kumano, H., Kochi, K., Lehmann, D.
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Document type:
| Abstract
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Number of reproductions:
| 1
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Reference:
| Faber, P., Tei, S., Pascual-Marqui, R., Gianotti, L., Kumano, H., Kochi, K., & Lehmann, D. (2009). Scalp EEG connectivity and intracerebral electrical connectivity (sLORETA lagged coherence) during resting and five meditation traditions. Kognitive Neurophysiologie des Menschen/ Human Cognitive Neurophysiology, 2(1), 8-9.
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| Indexed document: | No
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| Keywords: | Five meditation traditions / Resting / Meditation / sLORETA / Electroencephalogram (EEG) / Scalp EEG coherence
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Scalp EEG connectivity and intracerebral electrical connectivity (sLORETA lagged coherence) during resting and five meditation traditions |