更多的相似性比差异:比较早期青少年大脑结构的性别内和性别之间的差异
Carinna Torgerson1, Katherine Bottenhorn1, Hedyeh Ahmadi1
1University of Southern California.
Research square
|November 1, 2024
概括
青少年大脑研究往往通过关注群体平均值来高估性别差异. 这项研究揭示了青春期早期男性和女性大脑结构之间的相似之处多于差异,强调了差异分析的重要性.
科学领域:
- 神经科学是一个神经科学.
- 发育神经科学的发展神经科学.
- 人类大脑发育 人类大脑发育
背景情况:
- 目前的青少年神经成像研究经常关注两性之间的平均差异,可能高估了性二态.
- 这种方法忽视了男性和女性之间大脑结构分布的差异和重叠的重要性.
研究的目的:
- 描述青春期早期关于出生时性别的大脑宏观和微观结构的变异.
- 检查性别内部和性别之间的差异,分布重叠,以及大脑指标中差异不均性.
主要方法:
- 利用了来自青少年大脑认知发展 (ABCD) 研究的9-11岁儿童的大型样本 (N=7,723).
- 分析了全球和区域灰色/白质体积,皮质厚度和白质微观结构 (微分异构,平均扩散性).
- 采用Fligner-Killeen测试用于差异同质性和ANOSIM进行相似性分析,使用原始和残留的大脑估计.
主要成果:
- 男性和女性大脑结构分布之间的重叠始终大于差异.
- 在皮层和皮层下体积中观察到显著的异质差异;一些区域在其他指标的变异中显示出性别差异.
- 剩余的结果显示了更大的重叠和更小的性别差异,这表明在计算共变量后,相似性更大.
结论:
- 在早期青少年大脑结构中观察到的性别差异可能源于差异差异,而不是独特的表型.
- 这些发现挑战了高度性别二态大脑的概念,揭示了两性之间相当大的相似性.
- 强调在分析大脑结构中的性别差异时考虑差异的关键作用.
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