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135. B. Hubbard, The Untrue Story of You (London, UK: Hay House, 2014) and the act of altruism itself may have been healing and helped to increase a natural sense of joy.
136. «If you want to be happy, practice compassion. If you want others to be happy, practice compassion». The Dalai Lama Prayer studies of group prayer.
137. Group effect of the circles. The altruistic impllse comes when we step out of our own individuality and into a place of oneness.
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138. U. Lindenberger, et al, «Brains swinging in concert: cortical phase synchronization while playing guitar», BMC Neuroscience, 2009; 10: 22.
139. V. Müller, et al. «Intra– and Inter-brain Synchronization during Musical Improvisation on the Guitar, PLoS One, 2013.
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