性取向与人类大脑前连合的大小
Sexual orientation and the size of the anterior commissure in the human brain.
作者信息
Allen L S, Gorski R A
机构信息
Department of Anatomy and Cell Biology, University of California, Los Angeles 90024.
出版信息
Proc Natl Acad Sci U S A. 1992 Aug 1;89(15):7199-202. doi: 10.1073/pnas.89.15.7199.
Abstract
The anterior commissure, a fiber tract that is larger in its midsagittal area in women than in men, was examined in 90 postmortem brains from homosexual men, heterosexual men, and heterosexual women. The midsagittal plane of the anterior commissure in homosexual men was 18% larger than in heterosexual women and 34% larger than in heterosexual men. This anatomical difference, which correlates with gender and sexual orientation, may, in part, underlie differences in cognitive function and cerebral lateralization among homosexual men, heterosexual men, and heterosexual women. Moreover, this finding of a difference in a structure not known to be related to reproductive functions supports the hypothesis that factors operating early in development differentiate sexually dimorphic structures and functions of the brain, including the anterior commissure and sexual orientation, in a global fashion.
摘要
前连合是一种纤维束，在女性的正中矢状面区域比男性的更大。研究人员对90例来自男同性恋者、异性恋男性和异性恋女性的死后大脑进行了检查。男同性恋者前连合的正中矢状面比异性恋女性大18%，比异性恋男性大34%。这种与性别和性取向相关的解剖学差异，可能部分解释了男同性恋者、异性恋男性和异性恋女性在认知功能和大脑偏侧化方面的差异。此外，这一在与生殖功能无关的结构中发现差异的结果，支持了这样一种假设，即发育早期起作用的因素以一种整体方式区分大脑的性别二态性结构和功能，包括前连合和性取向。
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