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This chapter will focus on electromagnetic fields generated by the heart that permeate every cell and may act as a synchronizing signal for the body in a manner analogous to information carried by radio waves. Particular emphasis will be devoted to evidence demonstrating that this energy is not only transmitted internally to the brain but is also detectable by others within its range of communication. The heart generates the largest electromagnetic field in the body. The electrical field as measured in an electrocardiogram (ECG) is about 60 times greater in amplitude than the brain waves recorded in an electroencephalogram (EEG). The magnetic component of the heart’s field, which is around 100 times stronger than that produced by the brain, is not impeded by tissues and can be measured several feet away from the body with Superconducting Quantum Interference Device (SQUID)-based magnetometers (1). We have also found that the clear rhythmic patterns in beat-to-beat heart rate variability are distinctly altered when different emotions are experienced. These changes in electromagnetic, sound pressure, and blood pressure waves produced by cardiac rhythmic activity are "felt" by every cell in the body, further supporting the heart’s role as a global internal synchronizing signal.