Single-trial characterization of frontal theta and parietal alpha oscillatory episodes during spatial navigation in humans.

IF 2.9 2区 医学 Q2 NEUROSCIENCES
Mireia Torralba-Cuello, Angela Marti-Marca, Márta Szabina Pápai, Salvador Soto-Faraco
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引用次数: 0

Abstract

Theoretical proposals and empirical findings both highlight the relevance of theta brain oscillations in human spatial navigation. However, whilst the general assumption is that the relevant theta band activity is purely oscillatory, most empirical studies fail to disentangle oscillatory episodes from wide band activity. In addition, experimental approaches often rely on averaged activity across trials and subjects, disregarding moment-to-moment fluctuations in theta activity, contingent on key aspects of the task. Here, we used novel oscillation detection approaches to investigate the dynamics of theta and alpha episodes in human subjects performing a spatial navigation task in a virtual reality environment, resolved at single-trial level. The results suggest that bouts of frontal theta oscillatory activity are related to task difficulty and access to previously encoded information, across different timescales. Parietal alpha episodes, instead, seem to anticipate successful navigational decisions and could be related to shifts in internal attention.

人类空间导航过程中额叶θ和顶叶α振荡发作的单次试验特征。
理论建议和实证结果都强调了θ波振荡在人类空间导航中的相关性。然而,虽然一般假设相关的θ波段活动纯粹是振荡的,但大多数实证研究未能将振荡事件与宽带活动分开。此外,实验方法通常依赖于试验和受试者的平均活动,而忽略了theta活动的每时每一刻的波动,这取决于任务的关键方面。在这里,我们使用新颖的振荡检测方法来研究在虚拟现实环境中执行空间导航任务的人类受试者的theta和alpha事件的动态,在单次试验水平上解决。结果表明,在不同的时间尺度上,额叶θ波振荡活动的回合与任务难度和对先前编码信息的获取有关。相反,顶叶α发作似乎预示着成功的导航决策,可能与内部注意力的转移有关。
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来源期刊
Cerebral cortex
Cerebral cortex 医学-神经科学
CiteScore
6.30
自引率
8.10%
发文量
510
审稿时长
2 months
期刊介绍: Cerebral Cortex publishes papers on the development, organization, plasticity, and function of the cerebral cortex, including the hippocampus. Studies with clear relevance to the cerebral cortex, such as the thalamocortical relationship or cortico-subcortical interactions, are also included. The journal is multidisciplinary and covers the large variety of modern neurobiological and neuropsychological techniques, including anatomy, biochemistry, molecular neurobiology, electrophysiology, behavior, artificial intelligence, and theoretical modeling. In addition to research articles, special features such as brief reviews, book reviews, and commentaries are included.
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