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默认模式网络显示了不同的情绪和上下文反应,但在任务中检索需求的共同效应
Nicholas E Souter1,2, Antonia de Freitas1,3, Meichao Zhang1,4,5
1Department of Psychology, University of York, York, UK.
Human brain mapping
|May 8, 2024
概括
默认模式网络 (DMN) 为情感和语义关联展示了不同的子网络. 在DMN中的内存切换涉及受控的内部认知,揭示其功能组织,以满足各种检索需求.
科学领域:
- 神经科学是一个神经科学.
- 认知神经科学 认知神经科学
- 脑部成像 脑部成像
背景情况:
- 默认模式网络 (DMN) 支持基于内存的认知,但其对于不同的检索模式的功能组织尚不清楚.
- 该DMN位于主要连接梯度的异模端,与感觉运动区域分开.
研究的目的:
- 调查DMN子网络的激活是否根据检索需求或关联类型 (语义上下文与情感) 不同.
- 探索DMN在支持不同类型的记忆检索中的功能组织.
主要方法:
- 功能磁共振成像 (fMRI) 用于在图像关联任务期间检查大脑活动.
- 参与者从新图片中获取语义上下文或情感关联,区分"生成"和"切换"阶段.
主要成果:
- 语义上下文和情感关联参与了可分离的DMN子网络,前和中的时间DMN分别显示了情感和语义关联的偏好.
- 与"生成"阶段相比",切换"阶段招募了靠近主要梯度异模顶点的区域.
- 记忆切换激活了与受控的内部认知相关的独特子网络,无论协会类型如何.
结论:
- 根据访问的关联类型 (语义与情感) 进行了维度组织DMN组织.
- 记忆切换招募了与受控内部认知相关的特定DMN子网络.
- 这些发现澄清了不同协会的DMN招聘模式,以及对检索需求的共同反应.
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