在健康的老年人中,序列记忆下降的功能连接相关性与功能连接相关
Catalina Trujillo-Llano1, Nina M Ehrhardt1, Anna Elisabeth Fromm1
1Department of Neurology, Universitätsmedizin Greifswald, Greifswald, Germany.
GeroScience
|January 30, 2026
概括
由于大脑连接性发生变化,衰老会损害情节序列记忆. 老年人在记忆和注意力网络中表现出功能连接性 (FC) 的减少,与年轻人不同,他们的记忆依赖于海马-感知集成.
科学领域:
- 神经科学是一个神经科学.
- 认知老龄化 认知老龄化
- 神经成像是一种神经成像.
背景情况:
- 情节序列记忆对于日常生活至关重要,但随着年龄的增长而下降.
- 与年龄相关的序列记忆衰退的神经机制尚未得到充分理解.
研究的目的:
- 在序列记忆任务中,研究老年人 (OA) 与年轻人 (YA) 相比,老年人 (OA) 的静止状态功能连接 (FC).
- 为了确定序列记忆性能和与年龄相关的差异的神经相关物.
主要方法:
- 使用休息状态功能磁共振成像 (rsfMRI) 和 38 OA 和 20 YA 的序列记忆任务.
- 分析了基于种子的FC模式,专注于海马和默认模式网络 (DMN) 区域.
- 年龄组之间的序列记忆性能 (%正确) 和FC的比较.
主要成果:
- 在序列记忆方面,OA的表现比YA更差.
- 在OA中,较低的性能与海马和DMN之间以及DMN和表皮层之间减少的FC相关.
- 在YA中,更好的表现与海马和脑后皮层之间的更高FC相关.
结论:
- 衰老中的序列记忆下降与记忆网络内以及记忆和注意力网络之间的内在合减少有关.
- 独特的连接模式支持年轻人与老年人的序列记忆,表明网络功能转变而不是缺陷.
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