Studies show that the volume or thickness of certain brain regions expand during monthly periods—but they don’t reveal whether that’s connected to emotional fluctuations.
The important connection here is that the uterus growth-stimulating effect of estrogen also applies to the hippocampus, which is important in forming and retrieving memories. This means that a few days after your girl is done with her period is the absolute worst time to make a mistake. That memory will be locked in forever.
She'll be able to recall it decades later. Thanks to the power of estrogen.
I'm not a biologist, nor can I read that paywalled article, but I'd be curious to learn how the male, prepubescent and post menopausal population is affected by the menstrual cycle.
I don't know about post-menopausal people but anyone who spends a significant amount of time with a menstruating girl will have their brain shaped by it. It's only a matter of time!