EEG or ElectroEncephalogram is the scientific way to measure electrical brainwaves. Coherence is mathematical way of measuring how "in sync" different parts of the brain are. Meditators have higher EEG Coherence than non-meditators.
Here is the research:
Lutz, A., Greischar, L., Rawlings, N.B., Ricard, M., Davidson, R.J. November 2004 Long-term meditators self-induce high-amplitude synchrony during mental practice Proceedings of the National Academy of Sciences, 101, 16369-16373.
Stancak A Jr, Kuna M. 1994
EEG changes during forced alternate nostril breathing.
Banquet, J.P., and M. Sailhan. "EEG Analysis of Spontaneous and Induced States of Consciousness." Revue d'Electroencephalographie et de Neurophysiologie Clinique 4 (1974): 445-453.
Das, N., and H. Gastaut. "Variations in the Electrical Activity of the Brain, Heart, and Skeletal Muscles during Yogic Meditation and Trance." Electroencephalography and Clinical Neurophysiology, supplement no. 6 (1955): 211-219.
ORME-JOHNSON, D. W.; WALLACE, R. K.; DILLBECK, M. C.; ALEXANDER,C. N.; and BALL, O. E. Improved functional organization of the brain through the Maharishi Technology of the Unified Field as indicated by changes in EEG coherence and its cognitive correlates: A proposed model of higher statesof consciousness. Departments of Psychology and Biology, Maharishi International University, Fairfield, Iowa, U.S.A.; Department of Psychology and Social Relations, Harvard University, Cambridge, Massachusetts, U.S.A.; and Departmentof Education, University of Georgia, Athens, Georgia, U.S.A. Paper presentedat the American Psychological Society Annual Convention, Los Angeles, California,U.S.A., September 1981.
MISZCZAK, J., and ACHIMOWICZ, J. Hybrid analysis of spontaneousbrain activity in different states of conscious experience. Military Instituteof Aviation Medicine, Warsaw, Poland. Results presented at the 5th AnnualMeeting on EEG and Clinical Neurophysiology, Esztergom, Hungary, 1-9 October1982.
NIDICH, R.; NIDICH, S. I.; ORME-JOHNSON, D. W.; and WALLACE, R.K. EEG coherence and the length of practice of the Transcendental Meditationprogram. Departments of Education, Psychology, and Biology, Maharishi InternationalUniversity, Fairfield, Iowa, U.S.A., 1983.
NIDICH, S. I.; NIDICH, R., ABRAMS, A.; ORME-JOHNSON, D. W.; andWALLACE, R. K. Frontal lobe functioning: EEG coherence as a predictor ofhighly pro-social behavior in subjects practicing the Transcendental Meditationand TM-Sidhi program. Departments of Education, Psychology, and Biology,Maharishi International University, Fairfield, Iowa, U.S.A., 1982.
BANQUET, J. P. EEG and meditation. Electroencephalography andClinical Neurophysiology 33: 454 (Abstract), 1972.
WESTCOTT, M. Hemispheric symmetry of the EEG during the TranscendentalMeditation technique. Department of Psychology, University of Durham, Durham,England, 1973.
HAYNES, C. T.; HEBERT, J. R.; REBER, W.; and ORME-JOHNSON, D. W.The psychophysiology of advanced participants in the Transcendental Meditationprogram: Correlations of EEG coherence, creativity, H-reflex recovery, andexperience of transcendental consciousness. Psychophysiology Laboratory,Centre for the Study of Higher States of Consciousness, Maharishi EuropeanResearch University, Switzerland, 1976.
WILLIAMS, P., and WEST, M. EEG responses to photic stimulation inpersons experienced at meditation. Electroencephalography and ClinicalNeurophysiology 39: 519-522, 1975.
BANQUET, J. P.; HAYNES, C.; HEBERT, R.; and REBER, B. Analysis ofsleep in altered states of consciousness by classical EEG and coherencespectra. Electroencephalography and Clinical Neurophysiology 43(4):503, E 203 (Abstract), 1977. BANQUET, J. P.; HAYNES, C.; HEBERT, R.; and REBER, B. Analysis ofsleep in altered states of consciousness by classical EEG and coherencespectra. Electroencephalography and Clinical Neurophysiology 43(4):503, E 203 (Abstract), 1977.
HEBERT, R., and LEHMANN, D. Theta bursts: An EEG pattern in normalsubjects practicing the Transcendental Meditation technique. Electroencephalographyand Clinical Neurophysiology 42: 397-405, 1977.
