Reference code: | PT/FB/BL-2006-044.16 |
Location: | Arquivo PCA - Pasta 19/2006
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Title:
| EEG LORETA lagged coherence during resting, attention to calculation and attention to breathing
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Publication year: | 2010
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URL:
| http://www.med.uni-giessen.de/physio/Kognitive_Neurophysiologie_2010_3_1.pdf
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Abstract/Results: | ABSTRACT:
Do different types of attention show related tendencies of intracerebral functional connectivity? 58-channel EEG of 25 healthy, meditation-naïve, right-handed, male students was recorded during three conditions of 5 minutes each with closed eyes in randomized order: (1) resting [3 runs], (2) mental arithmetic [2 runs], and (3) breath counting, a meditation initiation technique [2 runs]. Artifact] controlled EEG data were recomputed, for the 8 EEG frequency bands, into eLORETA intracerebral current densities. Interpretation of functional connectivity between brain areas when using head surface]recorded EEG suffers from (1) uncertainty about intracerebral source localization and (2) effects of volume conduction. Computing coherence via source modeling (e.g. LORETA) avoids problem (1), and excluding coherences with zero phase lag avoids problem (2). Accordingly, we computed ”lagged coherence” intracerebral connectivity between eLORETA current densities in 19 regions of interest. Averaged resting condition was compared to the breath counting and the arithmetic run of which participants post-hoc reported that their concentration during task
performance was best. Paired t-tests between conditions yielded differences of coherence at p<0.1 (corrected for multiple testing) for 4 frequency bands (alpha1, beta2, beta3, gamma) [number of connections in brackets]: breath counting showed lower coherence than rest (all 4 bands [2,1,1,6]) and arithmetic (alpha1, beta2, gamma [1,2,2]); arithmetic showed higher coherence than rest (gamma [1]). In sum, of all three conditions, breath counting showed lowest demands on intracerebral functional connectivity. The results do not support generally increased coherence during attention. Instead, they suggest that breath counting and mental arithmetic induce mental states whose inter-area connectivity differs in several frequency bands. In the gamma frequency band, their inter-area connectivity differs in opposite directions from rest.
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Accessibility: | Document exists in file
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Copyright/Reproduction:
| By permission
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Language:
| eng
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Author:
| Milz, P.
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Secondary author(s):
| Faber, P., Pascual-Marqui, R., Lehmann, D.
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Document type:
| Abstract
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Number of reproductions:
| 1
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Reference:
| Milz, P., Faber, P., Pascual-Marqui, R., & Lehmann, D. (2010). EEG-LORETA lagged coherence during resting, attention to calculation and attention to breathing. Kognitive Neurophysiologie des Menschen/ Human Cognitive Neurophysiology, 3(1), 39-40.
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Indexed document: | No
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Keywords: | Attention / Meditation / Resting / Breath counting / Mental arithmetic / Intracerebral functional connectivity
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EEG LORETA lagged coherence during resting, attention to calculation and attention to breathing |
EEG LORETA lagged coherence during resting, attention to calculation and attention to breathing