The time we live in, the society that we are a member of and our personal lives and experiences deeply determine the productions of the artist, the theorist or even the athlete. When, where and who we are inform what we can create.

There are very few studies on the influence of the environment on estrogen. There are no studies on the influence of the environment on male hormone levels tracing how those changes might manifest in the features of progeny. Wakening from our patrifocal slumber, we will discover many things we did not consider paying attention to. We do not have studies in those two areas that trace the influence of environmental variables and sexual selection proclivities on human evolution. Theorists are left to focus on what we do know about the influence of environmental variables on the testosterone levels of mothers.

What haunts me is a deep-felt certainty that changing levels of estrogen, modified via sexual selection and environmental influences, have influenced, and continue to influence, our evolution. Clearly, individuals exhibiting a low level of testosterone allow for a more influential role for estrogen in their lives. I suspect there is more to it than that. For example, a male with low testosterone levels but high estrogen will behave differently from a male with low testosterone and low estrogen. What are the physiological and neurological manifestations of these two types? How do they behave differently? How do cultures leaning in one direction or the other differ?

It is a premise of this work that testosterone-driven changes in maturation rates (neoteny) prolonging the features of our infant progenitors into the adults of their descendants have resulted in radical physiological, neurological, behavioral and experiential change. There are hundreds of papers tracing the effects of various variables on testosterone levels. There are papers describing the influence of mother’s testosterone levels on the maturation rates of her children. Biologists are familiar with the influence of testosterone on males’ display and hierarchical standing.

But what about estrogen?

If testosterone compels one to compete and estrogen to connect, might unusually high or low levels of estrogen have something to do with autism? For example, might low estrogen encourage dissociation by making it difficult to connect or high estrogen encourage dissociation by enhancing the process of making connections in the mind? I have no idea.

If higher levels of estrogen inhibit height, what are the maturation-rate effects of estrogen, if any? Do higher or lower levels of estrogen encourage or inhibit maturation rates evidenced by testosterone levels? Estrogen levels can determine when a girl reaches puberty. Too little and puberty can be delayed, resulting in increased height and possible continued brain growth. Could relatively little estrogen in the females of our ancestors have resulted in delayed puberty and larger brain growth over time? Pubertal testosterone surges curtail brain growth. Does estrogen have a similar effect?

With more information, perhaps evolutionary theorizing can achieve more depth.


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