在主观认知衰退中,高保真度记忆检索的基础是受损的大脑网络:基于任务的fMRI研究
Wei Tang1,2, Qinghe Zeng1,2, Kaiqi Xie1,2
1Center on Aging Psychology, CAS Key Laboratory of Mental Health, Institute of Psychology, Chinese Academy of Sciences, Beijing, China.
Alzheimer's & dementia : the journal of the Alzheimer's Association
|December 28, 2024
概括
患有主观认知衰退 (SCD) 的老年人表现出客观记忆检索缺陷. 脑部成像显示海马-CN连接受损,部分原因是角回形,影响记忆准确性.
科学领域:
- 神经科学是一个神经科学.
- 认知科学 认知科学
- 医疗成像医学成像
背景情况:
- 主观认知衰退 (SCD) 与记忆障碍和大脑区域障碍有关.
- 之前的研究使用了分子成像和静止状态fMRI,但SCD中大脑区域的相互作用仍然不清楚.
研究的目的:
- 通过基于任务的fMRI来研究SCD内存缺陷背后的神经机制.
- 在SCD患者的记忆检索过程中检查大脑区域之间的功能连接 (FC).
主要方法:
- 利用记忆力相似性任务来评估高保真性检索.
- 采用MRI测量SCD个体和对照者之间大脑激活和FC (通用心理生理相互作用) 的群体差异.
主要成果:
- 患有SCD的个体表现出更差的高保真检索,与海马体低活化和控制网络 (CN) 过度活化有关.
- 在SCD中观察到海马体和CN之间减少的FC,角旋 (AG) 部分调解了这种断开.
结论:
- 在SCD的老年人中确认了客观的高保真性检索缺陷.
- 突出了AG无法整合神经信息的作用,导致记忆障碍.
- 这些发现强调了检查SCD认知过程和神经集成中障碍的重要性.
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