Entrainment

What does entrainment mean when you are talking about the connection between the heart and the brain?

Entrainment—coordination, synchronization, matching—is said to be a universal phenomenon. It can occur when one system that can be observed in a physical sense (e.g., pendulum clocks) can entrain or begin to match the frequency of another system. In biological systems (e.g., two humans who hold each other’s hand), the heart rhythm can synchronize. The heart beats in each individual begin to match. It is also believed that the level of consciousness has to do with more than the mind. Apparently, another operating system is located anatomically in the heart that helps to entrain or “cause to be in tune” the brain and the heart. There is a word—Philokalia—that is defined as “putting the mind in the heart.”