a) what's your source for this?
b) how is being left brain dominant i.e. being creative, any less a quality suited to a managerial position?
for a moment without questioning the science, how do you yourself define those traits in terms of if they lean more toward masculinity or femininity? I think aggressiveness/ calculative tendency / hierarchical assertion (all ultimately required in a top managerial position imo) are fundamentally masculine traits.
But accounting for characteristic discrepancy between men and women in an evolutionary context, we need to look at the evolutionary demands/ selective processes that have led men and women to their current biological states:
I.e. the example of
Hierarchy - male social structure is more hierarchical as we tend to categorize groups in a way that shows clear leadership/ competitive roles - i.e. there's always an alpha of the group, the betas etc (these may sound like abstract and non applicable terms, but think about it in your own personal setting) - the reason behind this is somewhat linked to our egos as well as HOW males seek mates (we do so by distinguishing/ asserting ourselves within social structure). On the contrary though, females tend to be more social and less competitive in their group settings as sexual initiation/ mateship largely corresponds to male assertion (i.e. the 'alpha' female derives her stature by being selected by an 'alpha' male). Evolutionary psychologists account for these differences in male and female social structure by examining the dynamics of the relationship between the genders where males were essentially the providers and females were passive, non-iniative bearers of children (Essentially meaning that males derived sexual value from their capacity to provide and be compatible protectors of children, THUS why we are more competitive and hierarchical by nature)
This is all a very superficial explanation of the rationale behind how evolutionary psychologists account for/ theorise on social and characteristic discrepancies between men and women. I'd invite you to have a read and look into evolutionary psychology yourself (its very interesting and would be much more convincing scientifically than a post on bos ever could)
And in terms of managerial positions, I think we have to distinguish between the creative innovators and the senior managers who have worked their way to managerial success. Managers are there because they've endured for a long time in the same job with a high degree of loyalty, networking, technical skill etc - they aren't there because they're creative people with radical ideas (they may as well could be, but if they were they're more likely to be entrepreneurs). Put it this way, no poet who has gone down in history as a creative 'left brain' revolutionary would survive in the corporate setting; creative people don't have it in their nature to work through a hierarchical system that is monotonous and limiting. Bill gates' creativity has made him an entrepreneur, not someone who has had to work through the corporate ladder and become a senior manager after years of networking (or brown-nosing if you like) and monotony.