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人类大脑活动和功能连接与口头长期记忆巩固相关,跨越1个月
Catherine W Tallman1,2, Zhishang Luo3,2, Christine N Smith2,4,5
1Department of Psychology, University of California, San Diego, San Diego, CA, United States.
Frontiers in human neuroscience
|March 7, 2024
概括
长期记忆的巩固包括随着时间的推移大脑的重组. 这项研究使用fMRI显示与老年人记忆巩固相关的大脑活动和连接性的变化超过一个月.
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:
- 宣言性记忆最初依赖于海马,然后通过新皮层重组稳定.
- 记忆巩固期间神经重组的精确时间表尚未完全理解.
- 与检索相关的大脑功能的时间依赖的变化发生在几个小时到几个月的时间内.
研究的目的:
- 为了研究大脑活动和功能连接性变化在长期记忆巩固口头材料超过一个月的老年人.
- 检查记忆年龄 (1小时至1个月) 如何影响与检索相关的大脑活动和海马/vmPFC连接.
- 为了区分与整合相关的神经变化与行为或重新编码效应.
主要方法:
- 年长的成年人 (N=24) 具有正常的认知研究了口头材料.
- 在一次识别记忆测试期间,每隔1小时,1天,1周和1个月进行fMRI扫描.
- 分析了整个大脑活动和海马体和腹中前额皮层 (vmPFC) 的功能连接,控制行为变化.
主要成果:
- 在皮质区域的检索相关的大脑活动显示了年龄相关的增加/减少.
- 海马活动随着记忆年龄的增长而下降.
- vmPFC的连接性增加了后面的顶膜皮层和自身,而海马与vmPFC/轨道前皮层的连接性减少了.
结论:
- 观察到的神经变化与系统整合理论一致.
- fMRI可以在短时间内 (几个小时到几个月) 检测长期记忆巩固过程,特别是对于口头信息.
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