Meditation
"Davidson said that the results unambiguously showed that meditation activated the trained minds of the monks in significantly different ways from those of the volunteers. Most important, the electrodes picked up much greater activation of fast-moving and unusually powerful gamma waves in the monks, and found that the movement of the waves through the brain was far better organized and coordinated than in the students. The meditation novices showed only a slight increase in gamma wave activity while meditating, but some of the monks produced gamma wave activity more powerful than any previously reported in a healthy person, Davidson said." - 'Meditation Gives Brain a Charge, study finds' - http://www.washingtonpost.com/wp-dyn/articles/A43006-2005Jan2.html
'Long-term meditators self-induce high-amplitude gamma synchrony during mental practice' - "Previous studies show the general role of neural synchrony, in particular in the gamma-band frequencies (25–70Hz),
in mental processes such as attention, working-memory, learning, or conscious perception (3–7). Such synchronizations of oscillatory neural discharges are thought to play a crucial role in the constitution of transient networks that integrate distributed neural processes into highly ordered cognitive and affective functions (8, 9) and could induce synaptic changes (10, 11). Neural synchrony..." - http://www.pnas.org/content/101/46/16369.full.pdf+html
Theory - 'The Coherent Heart Heart–Brain Interactions, Psychophysiological Coherence, and the Emergence of System-Wide Order'
Schizophrenia
'Gamma Oscillation and Schizophernia' -"With these methods, rhythmic activity of various frequencies such as delta (0–4 Hz), theta (4–8 Hz), alpha (8–12 Hz), beta (12–30 Hz) and gamma (30–200 Hz) can be detected. These neural oscillations are correlated with and are believed to play a role in normal cognitive processes including memory, attention, perceptual binding and consciousness.1
Investigating possible dysfunction in rhythmic activity in psychiatric and neurologic disorders has recently emerged as a potentially powerful approach to help determine what is wrong with neural circuits in these conditions. To date, the most intensively studied disorder in this respect is schizophrenia. However, evidence for disordered rhythms has also accumulated for other conditions including epilepsy, autism, attention-deficit hyperactivity disorder, Alzheimer disease and Parkinson disease."- http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2834788/
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