Complex continuous wavelet coherence for EEG microstates detection in insight and calm meditation |
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| Institution: | 1. School of Computer Science, Engineering and Mathematics, Flinders University, GPO Box 2100, Adelaide, South Australia 5001, Australia;2. Centre for Neuroscience and Department of Neurology, Flinders University, GPO Box 2100, Adelaide, South Australia 5001, Australia;3. Oxford Centre for FMRI of the Brain, Nuffield Department of Clinical Neurosciences, University of Oxford, UK;4. Lifeflow Meditation Centre, 8/259 Glen Osmond Rd, Frewville, South Australia 5063, Australia;5. School of Psychology, Flinders University, GPO Box 2100, Adelaide, South Australia 5001, Australia;6. Brain Health Clinics, GPO Box 6121, Halifax St, Adelaide, South Australia 5001, Australia;1. Department of Psychiatry and Psychotherapy, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, 20246 Hamburg, Germany;2. The KEY Institute for Brain-Mind Research, University Hospital of Psychiatry, CH-8032 Zurich, Switzerland;3. Developmental Neurophysiology, Center for Molecular Neurobiology, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, 20246 Hamburg, Germany;1. Epilepsy Center Rhein-Main, Goethe University Frankfurt am Main, Schleusenweg 2-16, Frankfurt am Main 60528, Germany;2. Department of Neurology and Brain Imaging Center, Goethe University Frankfurt am Main, Schleusenweg 2-16, Frankfurt am Main 60528, Germany;3. Department of Neurology, University Hospital Kiel, Schittenhelmstrasse 10, Kiel 24105, Germany |
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| Abstract: | Complex continuous wavelet coherence (WTC) can be used for non-stationary signals, such as electroencephalograms. Areas of the WTC with a coherence higher than the calculated optimal threshold were obtained, and the sum of their areas was used as a criterion to differentiate between groups of experienced insight-focused meditators, calm-focused meditators and a control group. This method demonstrated the highest accuracy for the real WTC parts in the frontal region, while for the imaginary parts, the highest accuracy was shown for the frontal occipital pairs of electrodes. In the frontal area, in the broadband frequency, both types of experienced meditators demonstrated an enlargement of the increased coherence areas for the real WTC parts. For the imaginary parts unaffected by the volume conduction and global artefacts, the most significant increase occurred for the frontal occipital pair of electrodes. |
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| Keywords: | Real part of continuous complex wavelet coherence EEG Meditation of calm Meditation of insight Imaginary part of continuous complex wavelet coherence |
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