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Lengthy parental absence deprives a child of limbic regulation. If he is very young, losing his parents upends his physiology. Prolonged separations even can be fatal to an immature nervous system, as vital rhythms of heart rate and respiration devolve into chaos. Sudden infant death is increased fourfold in the babies of mothers who are depressed—because without emotional shelter, infants die. The heart rhythms of securely attached babies are steadier than those with insecure relationships, just as the breathing teddy bear regularizes the respiration of premature infants. Synchronicity with parents (or, in a pinch, with another reliable rhythmic source) becomes the baby’s developing physiologic strength.
There are a number of scenarios in which the body fails to shut off the flow of stress hormones. The most obvious is simply unrelenting stress. If we never get a break, the recovery process never gets started, the amygdala keeps firing, and the production of cortisol spills over healthy levels. Sometimes the fight-or-flight switch gets stuck in the on position. It can be a function of genetics, according to epidemiological surveys: if you put a random group of people in a stressful public speaking situation, those whose parents suffered from hypertension still show elevated levels of cortisol twenty-four hours after the speech.