与任务相关的无周期性EEG活动,神经效率低下和年轻人和老年人的口头工作记忆之间的关系
Sabrina Sghirripa1,2,3, Alannah Graziano3,4, Mitchell Goldsworthy2,3,4
1Australian Institute for Machine Learning, School of Computer and Mathematical Sciences, The University of Adelaide, Adelaide, South Australia, Australia.
Psychophysiology
|January 30, 2026
概括
老年人表现出更平坦的EEG非周期指数,表明神经处理效率较低,在工作记忆任务中神经噪声更大. 这种神经效率低下可能导致与年龄相关的工作记忆的下降.
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
- 电子生理学 电子生理学
背景情况:
- 工作记忆 (WM) 的下降是衰老的标志.
- 增加的神经噪声是与年龄相关的WM衰退的拟议机制.
- 脑电图无周期指数是噪声的一个潜在的神经标记.
研究的目的:
- 在口头WM期间调查EEG无周期指数的年龄相关差异.
- 检查无周期指数和神经效率低下之间的关系.
- 探索无周期指数如何随着WM负载和年龄而变化.
主要方法:
- 重新分析了以前发表的EEG数据,这些数据来自年轻人和老年人.
- 参与者执行了一个修改后的Sternberg任务,使用不同的字母负载.
- 在固定和WM保留阶段计算的EEG无周期指数.
主要成果:
- 年轻的成年人表现出比老年人更的无周期性斜坡.
- 两组在保留期间都显示出平坦的指数,负载效应最小.
- 平面指数与神经效率低下 (增加P3b振幅) 相相关,但没有提高性能,特别是在老年人中.
结论:
- 平面EEG无周期指数与较低效率的神经处理有关.
- 老年人可以灵活调节他们的无周期指数以支持WM,尽管潜在的效率低下.
- 研究结果表明,无周期指数是神经噪声和认知衰老的有价值标记.
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