"Our heart rate changes with every heartbeat," Rollin McCraty, director of research at the Institute of HeartMath, explains. "It creates patterns we call heart rhythms." Researchers see the difference in heart rhythms easily when study participants wear portable recorders that allow researchers to monitor their heart rhythms as they go about their day. These rhythms provide "a window" into the inner workings of the communication system between the heart and the brain.

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