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Heart harmonies have scientists pricking up ears

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WASHINGTON — When people join their voices in song, their hearts come along for the group ride — speeding up, slowing down and (figuratively) swelling in unison while much of the chorale’s muscular movement and brain activity synchronizes as well. It’s probably the same phenomenon experienced by field workers, worshipers, soldiers and attendees of sporting events through the ages. But it might also be harnessed for strengthening working relationships in teams and at schools, say the Swedish researchers who explored the effect of choral singing on cardiac synchrony.

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