The Female Brain summary

Estrogen doesn’t just shape a female brain through gestation and early infancy – it also begins shaping a female body for sexual maturity and possible reproduction. But it’s not alone. At puberty, a rising tide of both estrogen and the hormone progesterone cycles kick off another phase of transformation, and this one is intense.

In the female puberty brain, these surges of hormones make for profound changes. They stimulate brain areas like her hippocampus, involved in memory and learning. They stimulate her amygdala, too – a neural center of emotions. The ebb and flow of estrogen and progesterone can make her even more sensitive to the moods, emotions, and rejection of others. 

As the female brain reaches adulthood, the hormonal roller coaster adds even more ups and downs. Throughout puberty, the pleasure centers of her brain have lit up from all that communicating and intense connection with her network. This oxytocin and dopamine-fueled drive for intimacy and sharing secrets might even be part of nature’s preparation for romance and bonding.

But nature has a sense of humor at this point, too, it would seem. While the female brain – influenced by cycles of estrogen and progesterone – now finds immense pleasure in communicating with romantic partners, the male brain at this stage is altogether different. Their soaring testosterone at puberty has dialed up their amygdala, too. But it brought on more aggression, reactivity and competition. The communication centers of their brain have far fewer neurons than female-brained peers, and their sensitivity to emotional cues doesn’t grow at puberty – it gets more repressed. 

If we were able to examine the female brain while dating, we’d see that each conversation with a potential romantic partner lit up the pleasure centers of her brain like a Christmas tree. She’d get a powerful “hit” of dopamine with each new text notification – which would pale in comparison to the surge she got from a long conversation or date. 

Oxytocin, the bonding hormone, would also be ramping up. The effects of this hormone are incredibly powerful in driving intimacy. A hug that lasts 20 seconds is all it takes to release a bath of oxytocin in the brain. Intimate talking, kissing, touching, and gazing into each others’ eyes all release a font of oxytocin in the female brain. She’d be more or less sensitive to it depending on her menstrual cycle. 

In pregnancy, the female brain must adapt to a whole new set of hormonal surges and neural circuits. Almost immediately, progesterone levels start to rise, and that brings on physical changes like swelling, tender breasts, and growing hunger and thirst. She feels the effects of extra progesterone on her brain, too. She might feel foggy and distracted, and incredibly tired all the time. Her sensitivity to smells soar, too, which can make her feel queasy and nauseous. But it also protects against stress during pregnancy; it has an almost tranquilizing effect.

Oddly enough, while the pregnant body is gaining weight and growing, the pregnant female brain is actually shrinking. This may be an adaptation to all the new neural structures the brain is getting ready to build during childbirth. Her faculties haven’t shrunk – her brain has simply become hyperefficient to compensate.

At this stage of life, female brains have already gone through several radical transformations – but it doesn’t stop there. With both maturity and motherhood, the aging female brain has become far more accustomed to these rapid-fire changes. Her brain centers for critical thinking and analysis have become incredibly efficient and secure. The female brain grows wiser and more integrated in each new phase.

This results in another stereotype: the perimenopausal woman waking up one day to change her life completely. The high levels of hormones, especially feel-good estrogen and oxytocin, she once experienced are now dropping off precipitously. This lowers the activity of her tending and nurturing brain circuits activated by them. Instead of feeling conflict-averse, she may feel confident enough to express herself strongly – and demand to have her own needs met. Her filters come off, and for many around her it can feel like a drastic change. 

The main takeaway here is that hormones are responsible for brain and neural development from conception through old age. In the female brain, levels of estrogen and progesterone play a huge role in driving puberty, maturation, sexuality, motherhood, and menopause. For many, these changes come with behavioral changes that might feel drastic and deeply personal. Instead, they are grounded in biology, and an awareness of their impact can help everyone with a female brain take control of their influence.