GOTHENBURG, Sweden, July 9 (UPI) -- People who sing in choirs are so well attuned to each other their heartbeats become synchronized as they perform, Swedish scientists say.
Monitoring the heart rates of 15 choir members as they performed a variety of choral works, researchers at Gothenburg University found as the members sang in unison their pulses began to speed up and slow down at the same rate, the BBC reported Monday.