快猫短视频

IF YOU鈥橰E a twin, your womb-mate may well have influenced your interests and
abilities. Experiments reported at the conference show that girls who develop
with a twin brother seem to have slightly more 鈥渕asculine鈥� brains than girls
with a twin sister.

快猫短视频s have begun to suspect that part of the reason male and female
brains differ is that hormones like testosterone alter brain development in the
womb. One clear difference is that men鈥檚 brains tend to have a dominant side
when it comes to hearing words. Women register words more evenly in both sides
of the brain.

So Celina Cohen of Utrecht University in the Netherlands and her colleagues
tested 67 girls with twin brothers and 54 girls with non-identical twin sisters.
All were 10 years old. The girls put on headphones and heard a voice saying a
different number simultaneously in each ear. They were then asked to recall one
of the numbers.

Each ear is connected most strongly to the side of the brain opposite it.
Girls with twin sisters recalled numbers from left and right sides fairly
evenly. But girls with twin brothers were more one-sided in their response,
indicating that one side of the brain was more active in hearing the
numbers.

Cohen thinks the brains of girls with twin brothers are slightly more
masculine, which supports the idea that these girls are exposed to higher levels
of testosterone in the womb.

However, the difference is small and Cohen plans further tests to confirm it.
She hopes to find out if these girls have other typically masculine traits in
areas such as verbal fluency, spatial reasoning and even throwing balls.