Research has shown that pregnancy is not just a physical transformation, but also a complex biological process that affects a woman's brain and behavior. During pregnancy, a woman's body undergoes a series of changes, including a "mise à jour" of her brain, where some secondary concerns are diminished, and ancient neural and hormonal circuits are reactivated. The primary goal of these changes is to protect the fetus and ensure the survival of the human species.
One of the most notable changes is the reactivation of the "nesting instinct," a primal urge shared among humans, birds, and mammals. As pregnancy advances, women often experience a strong desire to clean and prepare their environment, a behavior triggered by the hormone estradiol. This instinctual behavior is an evolutionary remnant from ancient times, when a clean environment was crucial to prevent the newborn from contracting deadly diseases.
Pregnancy also triggers a heightened sense of smell, often accompanied by cravings for specific foods. This biological response is an ancient defense mechanism that helps women avoid foods that may be spoiled or contaminated, which could harm the fetus. The hormone human chorionic gonadotropin (HCG) is responsible for this increased sensitivity to smell, which serves as a protective mechanism to ensure the mother's and fetus's safety.
The changes that occur during pregnancy also affect the brain's emotional centers, particularly the amygdala, which is responsible for fear and emotions. Studies have shown that the amygdala decreases in gray matter during pregnancy, but this reduction is not a loss of intelligence. Instead, it is a "refocusing" of the brain, making women more vigilant, cautious, and protective of themselves and their unborn child.
As pregnancy progresses, women's brains become more attuned to potential threats, and they become more defensive and protective of themselves and their fetus. This heightened state of alertness is an evolutionary remnant from ancient times, when women had to protect themselves and their newborns from predators. This biological response is essential for the survival of the human species.
After childbirth, a surge of oxytocin, often referred to as the "love hormone," floods the mother's brain, eliminating self-centeredness and creating a strong bond between the mother and child. This hormone is responsible for the mother's instinctual behavior, making her willing to sacrifice her own needs and well-being for the sake of her child.
In conclusion, the changes that occur during pregnancy are not just physical, but also biological and emotional. The reactivation of primitive instincts is an evolutionary adaptation that ensures the survival of the human species. These instincts, often perceived as "primitive" or "instinctual," are, in fact, a testament to the incredible biological and emotional transformations that women undergo during pregnancy.
Key points
- The reactivation of primitive instincts during pregnancy is an evolutionary adaptation that ensures the survival of the human species.
- The changes that occur during pregnancy affect not only the woman's physical body but also her brain and behavior.
- The surge of oxytocin after childbirth creates a strong bond between the mother and child, eliminating self-centeredness and creating a maternal instinct.
