Here is a good one: The male brain White and gray matter is not fully developed up past age 20...
with developmental curves for the frontal
and parietal lobe peaking at about age 12 and for the temporal
lobe at about age 16, whereas cortical gray matter continued to
increase in the occipital lobe through age 20.


http://brain.oxfordjournals.org/cgi/...act/119/5/1763


http://www.math.tau.ac.il/~dms/Longi.../brain_MRI.pdf


There is another one in which the introduction of estrogen to the male brain actually causes female characteristics. For those of you that don't know the human male brain is much different than the female brain. The Cortex, development, size, and so on... One of the leading issues in homosexual research is that many believe that the introduction of higher amounts of estrogen to the homosexual male's brain causes female characteristics

These results reveal a new mode of sex-specific neural development, induced not by differential exposure to gonadal steroids, but rather by differential synthesis of steroids in the brain.

http://www.nature.com/neuro/journal/...n0201_170.html