Today I want to talk about entrainment, and the fact that our brains are copycats that often mirror each other when one person is sending something to another. Brain mapping during certain types of healing, such as bioenergy, also shows evidence of brain-wave synchrony. In many instances, when one person is sending focused intention to another, their brains appear to become entrained. Entrainment is a term in physics which means that two oscillating systems fall into synchrony. It was coined in 1665 by the Dutch mathematician Christiaan Huygens, after discovering that two of his clocks with pendulums standing in close approximation to each other had begun to swing in unison. He’d been toying with the two pendulums and found that even if he started one pendulum swinging at one end, and the other at the opposite end, eventually the two would swing in unison. Two waves peaking and troughing at the same time are considered ‘in phase’, or operating in synch. Those peaking at opposite times are ‘out of phase’. Physicists believe that entrainment results from tiny exchanges of energy between two systems that are out of phase, causing one to slow down and the other to accelerate until the two are in phase. It’s also related to resonance, or the ability of any system to absorb more energy than normal at a particular frequency (the number of peaks and troughs in one second). Any vibrating thing, including an electromagnetic wave, has its own preferential frequencies, called ‘resonant frequencies’, where it finds vibrating the easiest. When it ‘listens’ or receives a vibration from somewhere else, it tunes out all pretenders and only tunes into its own resonant frequency. It’s a little bit like a mother instantly recognizing her child from among a mass of school children. Our sense of hearing operates through a form of entrainment: different parts of a membrane of the inner ear resonate to different frequencies of sound. Resonance even occurs in the seas, such as in the tidal resonance of the Bay of Fundy in the northeast end of the Gulf of Maine, near Nova Scotia. Once they march to the same rhythm, things that are entrained send out a stronger signal than they do individually. This most commonly occurs with musical instruments, which sound amplified when all playing in phase. At the Bay of Fundy, the time required for a single wave to travel from the bay’s mouth to its opposite end and back is exactly matched by the time of each tide. Each wave is amplified by the rhythm of each tide, resulting in some of the highest tides in the world.