Currently, 17 US states will legally change a person’s gender, on his birth certificate – but only with documentation that gender-reassignment surgery has been performed. For example:
Does the state allow a gender marker change on birth certificates?
New Mexico: Yes, with a doctor’s letter “indicating that the sex of an individual born in this state has been changed by surgical procedure.” See N.M. Stat. Ann. § 24-14-25(D) at http://law.justia.com/codes/new-mexico/2011/chapter24/article14/section24-14-25
Until now, the only required surgery was on the genitals, with secondary surgeries deemed optional. But new research has prompted some lawmakers to expand surgical requirements. More specifically, Richard Lynn’s Sex Differences in Intelligence:
Yet the male brain is on average 12 percent larger than the female brain, in both newborns and adults. Recent studies using in vivo magnetic resonance imaging (MRI) indicate that brain size has a correlation of between .31 and .43 with intelligence. The identical or near-identical IQ averages by sex were therefore a puzzle.
Arthur Jensen hypothesized that men and women might have the same number of neurons, with those of women more densely packed. However, subsequent research has shown that the male advantage in neurons is even greater than in brain weight: 16 percent, or the equivalent of four billion neurons.
The solution to the puzzle is to control for age. Most mental testing is done on school-age children, and Prof. Lynn’s research confirms that sex differences in this group are slight. However, neurological studies show that white matter in the brain continues to grow more in males than in females after mid-adolescence. Beginning at about age 16, boys have a small IQ advantage over girls, and this gradually grows to four points or more as adults.
Several states are now requiring male-to-female individuals to certify that they’ve had 12% of their brains removed. For example, New Mexico:
New Mexico: Yes, with a doctor’s letter “indicating that the sex of an individual born in this state has been changed by surgical procedure. This procedure must include genital reassignment, and the removal of no less than 12% of the brain for male to female.” See N.M. Stat. Ann. § 24-14-25(D) at http://law.justia.com/codes/new-mexico/2011/chapter24/article14/section24-14-25
I find it interesting that nobody seems to be talking about FEMALE to MALE individuals. This is probably because science has not yet advanced to the point where we can ADD 12% to a brain. I would suggest freezing the portions removed from the male-to-female patients, until we’re able to transplant them into female-to-male patients.