When does a foetus become male or female? Medical science tells us that a human embryo starts showing first sign of transformation to boy/girl at around 9th week in the womb. In other words an embryo assumes its sexual orientation quite early in its journey. So, one could safely assume that male/female boundary is quite distinct, right?
Actually no.
We already know that there is a sizable human population who do not abide by this clear boundaries, for whom the boundary is less physical and more social. The data shows that 1 out of every 1600 newborns are intersexuals and 1 out of every 100 new born is ambiguous w.r.t sex. Calculate the number for present world population and you will appreciate that data better.
Biological evidences aside, how about human mind? Does it have innate male/female traits?
There are popular [and pseudo-scientific] beliefs that male and female differences are irreconcilable. How often have you heard "all men are alike" or "Even God can't read women's mind!"? There are no reasons that millions of copies of 'Men from Mars, Women from Venus' are sold worldwide, right?
Well latest researches indicate otherwise. Neuroscience tells us that male/female is a continuum rather than well-separated set of traits. In this paper [http://www.ncbi.nlm.nih.gov/
It asserts further that, "Current data on the effects of environmental events on brain structure strongly suggest that heterogeneity in the “male/female” type of an individual’s brain characteristics is the rule, rather than the exception. Specifically, prenatal and postnatal manipulations (e.g., exposing dams to stress, maternal separation, rearing conditions, early handling, acute and chronic postnatal stress, prenatal exposure to psychoactive drugs, anesthesia) have been shown in rats to reverse, abolish, create, or exaggerate sex differences in brain characteristics.." The paper concludes therefore that for us, 'different individuals will have different combinations of “male” and “female” brain characteristics'.
Top graph shows distinct non-overlap in physical strength while the bottom graph shows striking overlap in psychological trait of assertiveness[source: Huffington Post] |
Brains, therefore, appear to be neither “male” nor “female,” they are “intersex”.
So next time, you try to blame the other sex, think twice!
And in case you are curious to know what percentage your brain is male/female, try this BBC quiz:
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