And for those convinced of absolutes, there remains the issue that most of the studies on brain differentiation are based on adult/youth brains. A brain that has already been exposed to a wider social environment of cultural influences.

But think of the brain of the London taxi driver. It has been demonstrated that they have larger-than-average memory centers in their brains. The longer they have been driving, the greater the difference. Yet no one is suggesting they are born with such brains; instead, it is the training and act of driving London that is considered the causal driver. 

Or in the early days of programming (WWII), women and "their" brains were considered to be superior to men's brains. Then...they weren't. Why was that? New brain research or work culture changes after the war? Except in one study, findings suggest code written by women was in fact more likely to be approved by their peers than code written by men. Hmm.

All complex, not simple declarative statements.