随机和系统的视觉刺激与整个大脑活动的半周期性空间时间模式之间的相互作用
Nan Xu1, Derek M Smith2,3, George Jeno4
1Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA, United States.
Imaging neuroscience (Cambridge, Mass.)
|September 13, 2023
概括
大脑活动中的近周期空间时间模式 (QPPs) 影响对视觉刺激的反应. 系统刺激增加了QPP的频率,而随机刺激影响了其大小,QPP通常会超过刺激发作反应.
科学领域:
- 神经科学是一个神经科学.
- 认知神经科学 认知神经科学
- 脑部成像 脑部成像
背景情况:
- 休息状态的大脑活动表现出与注意力和兴奋相关的半周期性时空模式 (QPPs).
- 这些内在的大脑活动模式可能与外部刺激相互作用,可能改变神经反应.
研究的目的:
- 研究视觉刺激如何影响正在进行的全脑活动模式 (QPPs).
- 为了确定QPP是否会改变大脑对突出视觉刺激的反应.
主要方法:
- 试验对象在两个条件下观看6Hz的棋盘刺激:系统的 (20.3秒间隔) 和随机的 (14-62.3秒间隔) 刺激.
- 分析了血液氧气水平依赖 (BOLD) 信号,以评估QPP和刺激引起反应的变化.
主要成果:
- 系统刺激改变了QPP阶段,而随机刺激影响了QPP大小.
- 在系统性刺激期间,QPP更频繁地发生,模式之间的间隔较短.
- 对视觉刺激的BOLD信号响应在刺激开始时经常被QPP掩盖.
结论:
- 视觉刺激条件对内在大脑活动模式 (QPPs) 有不同的影响.
- 准周期性时空模式显著影响,甚至可以主导大脑对外部刺激的反应.
- 这些发现揭示了内在神经动力学和感官处理之间的复杂相互作用.
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