推 crazyblue:整篇我只看中文字... 09/28 16:18
推 nunuhe: 整篇我只看中文字...+1 09/29 01:29
推 ly4308: 整篇我只看中文字...+1 09/29 01:40
在newscientist看到的一則報導.
挺有趣的 (剛好本人也在研究腦)
Brain scans have provided the most compelling evidence yet that being gay or
straight is a biologically fixed trait.
The scans reveal that in gay people, key structures of the brain governing
emotion, mood, anxiety and aggressiveness resemble those in straight people
of the opposite sex.
First they used MRI scans to find out the overall volume and shapes of brains
in a group of 90 volunteers consisting of 25 heterosexuals and 20 homosexuals
of each gender.
The results showed that straight men had asymmetric brains, with the right
hemisphere slightly larger – and the gay women also had this asymmetry. Gay
men, meanwhile, had symmetrical brains like those of straight women.
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作者利用MRI去scan異性戀與同志的大腦.
結果發現:
異性戀男人的大腦左右不對稱, 右大腦半球較大.
異性戀女人則對稱
男同志的大腦左右對稱
女同志則不對稱
不僅如此, 也利用PET去偵測amygdala的血流速率
They found that the patterns of connectivity in gay men matched those of
straight women, and vice versa (see image, above right). In straight women
and gay men, the connections were mainly into regions of the brain that
manifest fear as intense anxiety.
"The regions involved in phobia, anxiety and depression overlap with the
pattern we see from the amygdala," says Savic.
This is significant, she says, and fits with data showing that women are
three times as likely as men to suffer from mood disorders or depression. Gay
men have higher rates of depression too, she says, but it's difficult to know
whether this is down to biology, homophobia or simply feelings of being
"different".
In straight men and lesbians, the amygdala fed its signals mainly into the
sensorimotor cortex and the striatum, regions of the brain that trigger the
"fight or flight" response. "It's a more action-related response than in
women," says Savic.
http://0rz.tw/854LO
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