从SMA前测量的CBF梯度和激发-抑制平衡 - 在衰老中的重要性和语义流性任务困难
Venkatagiri Krishnamurthy1, Lisa C Krishnamurthy2
1Department of Veterans Affairs (VA) Health Care System, Decatur, GA, United States; Dept. of Medicine, Division of Geriatrics and Gerontology, Emory University, Atlanta, GA, United States; Dept. of Neurology, Emory University, Atlanta, GA, United States; Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA, United States.
NeuroImage
|September 13, 2025
概括
健康的衰老会改变前补充运动区域 (前SMA) 的大脑活动. 老年人表现出脑血流 (CBF) 梯度的减少和刺激抑制平衡 (EIB) 的改变,影响认知任务.
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:
- 健康的衰老与运动控制区域的神经变化有关.
- 补充前运动区域 (SMA前) 在运动规划和执行中发挥作用.
- 了解前SMA功能中与年龄相关的变化对于认知健康至关重要.
研究的目的:
- 为了研究健康衰老期间SMA前的神经变化.
- 检查这些神经变化与语义流任务难度之间的关联.
- 在与年龄有关的大脑变化中区分神经脱差和突触缩放.
主要方法:
- 在使用伪连续动脉旋转标记的前SMA亚区域量化空间大脑血流 (CBF) 梯度.
- 通过使用磁共振光谱学,通过GABA+/Glx比率评估激发抑制平衡 (EIB).
- 与语义流性相关的神经测量与语义流性任务执行.
主要成果:
- 年轻的成年人在SMA前表现出前后CBF梯度,在老年人中不存在 (神经脱差).
- 在SMA前,老年人表现出更强的抑制基调 (改变的EIB),与 Glx.减少有关.
- 组织校正的EIB与语义流任务难度有正相关,而CBF梯度没有.
结论:
- 与年龄相关的CBF梯度损失 (脱差) 和改变的EIB (突触缩放) 是不同的过程.
- 在SMA前的抑制性音调和突触缩放是衰老中语义流性表现的关键.
- 调查结果强调了EIB对老年人认知挑战的重要性.
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