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Because loving is reciprocal physiologic influence, it entails a deeper and more literal connection than most realize. Limbic regulation affords lovers the ability to modulate each other’s emotions, neurophysiology, hormonal status, immune function, sleep rhythms, and stability. If one leaves on a trip, the other may suffer insomnia, a delayed menstrual cycle, a cold that would have been fought off in the fortified state of togetherness.
Full-grown, these monkeys are living proof of limbic regulation’s enduring power: they are timid, clingy, subordinate, and clumsy in their efforts to establish ties to other monkeys. The brains of these animals evidence permanent alterations in neurochemistry. Just because their mothers once lived under a pall of uncertainty, these adult animals show lifelong changes in levels of neurotransmitters like serotonin and dopamine. With their vulnerability to anxiety and depression, their social awkwardness and failures to attach as adults, these monkeys exhibit a close animal counterpart to the multifaceted misery that in human beings is labeled neurotic.
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.
We call this mutually synchronizing exchange limbic regulation. The human body constantly fine-tunes many thousands of physiologic parameters—heart rate and blood pressure, body temperature, immune function, oxygen saturation, levels of sugars, hormones, salts, ions, metabolites. In a closed-loop design, each body would self-monitor levels and self-administer correctives, keeping its solitary system in continuous harmonious balance.