默认模式网络子系统在语义认知中的独特和互补作用
Ximing Shao1, Katya Krieger-Redwood2, Meichao Zhang2,3,4
1Department of Psychology, University of York, York, YO10 5DD, United Kingdom ximingshao93@gmail.com beth.jefferies@york.ac.uk.
概括
默认模式网络 (DMN) 有不同的子系统 (MT,核心,FT),它们通过根据任务需求和信息类型来激活或禁用来独特地促进语义认知.
科学领域:
- 神经科学是一个神经科学.
- 认知心理学 认知心理学
- 神经成像是一种神经成像.
背景情况:
- 默认模式网络 (DMN) 通常在外部任务期间被禁用,但支持语义认知.
- 它在各个子系统 (中间时[MT],核心,前时[FT]) 的功能组织在诸如感知合,输入模式,信息类型和控制需求等因素方面仍然不清楚.
研究的目的:
- 研究如何感知合,输入模式,信息类型和控制需求影响语义认知期间DMN子系统的激活和关闭.
- 将这些响应映射到由内在连接梯度定义的全脑状态空间内.
主要方法:
- 分析了四个基于任务的人体功能磁共振成像 (fMRI) 数据集.
- 检查DMN子系统对语义认知任务的响应 (激活/关闭).
- 在基于内在连接梯度的全脑状态空间中定位反应.
主要成果:
- FT子系统在各个领域,任务和模式中显示出一致的激活,特别是在抽象的,口头任务中,并且在更高的检索需求下表现出"调整"状态,激活/关闭的增加.
- MT子系统在感知合 (场景) 和解合 (自传记忆) 任务中被激活,对图像关联的反应更强烈,这表明它在场景构建中的作用.
- 核心DMN经常被禁用,特别是在面向外部的任务中,它的激活远离视觉皮层和认知控制区域.
结论:
- 不同的DMN子系统 (MT和FT) 支持不同的基于内存的表示,可以在内部和外部访问.
- 核心DMN中的禁用与苛刻的外部语义任务有关.
- DMN子系统的功能组织与它们在内在连接梯度上的位置有关,激活的区域比关闭的区域更接近感觉运动皮质.
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