外部任务开关可激活默认模式区域,而无需对周围场景进行增强处理
Ashley X Zhou1, John Duncan1, Daniel J Mitchell1
1MRC Cognition and Brain Sciences Unit, University of Cambridge, Cambridge, United Kingdom.
Imaging neuroscience (Cambridge, Mass.)
|August 13, 2025
概括
在外部任务切换期间,默认模式网络 (DMN) 活动会增加,而不仅仅是内部思想. 这表明DMN在复杂的任务转换期间参与更新认知模型.
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
背景情况:
- 默认模式网络 (DMN) 通常在外部聚焦的任务中被禁用.
- 之前的研究报告说,在认知领域之间要求外部任务切换时,DMN活动增加.
研究的目的:
- 为了复制DMN任务切换效应.
- 为了调查这种效应是否与处理更广泛的环境有关,比如背景场景.
- 测试DMN活动反映认知模型复杂性的假设.
主要方法:
- 功能磁共振成像 (fMRI) 用于测量大脑活动.
- 采用了任务切换范式,涉及认知领域之间的切换和领域内的切换.
- 介绍了背景场景,并对其处理进行了评估.
主要成果:
- 与重复相比,核心DMN在所有任务切换期间都显示出显著的活动.
- 休息和任务之间的切换引起了更强的DMN活动.
- 根据开关类型,背景场景处理没有差异,尽管注意力和回忆力.
- 域内和域间交换机的DMN活动类似.
结论:
- 外部任务开关可以独立于增强的背景场景处理来激活DMN.
- 任务开关的DMN调制可能反映了当前认知模型的变化.
- 认知模型的复杂性似乎会影响任务切换期间的DMN活动.
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