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And as we’ve mentioned, one of the most powerful tools we use to help regulate a distressed infant is rhythm. Oprah: Why is that? Dr. Perry: All life is rhythmic. The rhythms of the natural world are embedded in our biological systems. This begins in the womb, when the mother’s beating heart creates rhythmic sound, pressure, and vibrations that are sensed by the developing fetus and provide constant rhythmic input to the organizing brain. These experiences create powerful associations—essentially, memories—that connect rhythms of roughly sixty to eighty beats per minute (bpm) to regulation. Sixty to eighty bpm is the average resting heart rate for an adult; it’s the rhythm the fetus sensed, and it equates to being in balance, to being warm, full, quenched, safe. After birth, rhythms at these frequencies can comfort and soothe, whereas the loss of rhythm, or high, variable, and unpredictable patterns of sensory input, becomes associated with threat.
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Bruce D. Perry (What Happened to You?: Conversations on Trauma, Resilience, and Healing)