Sin Duho, Kim Min-Ki, Kim Jinsoo, Kim Sung-Phil
Department of Human Factors Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, Republic of Korea.
Department of Human Factors Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, Republic of Korea.
Neurosci Lett. 2019 Jan 18;690:171-177. doi: 10.1016/j.neulet.2018.10.034. Epub 2018 Oct 17.
Alpha oscillations generated in the human brain have long been investigated in neuroscience. Synchronized oscillatory activities of numerous neural oscillators are thought to underlie alpha oscillations. The amplitude of alpha oscillations reflects the degree of synchronization, which is often modulated through alpha activation and inactivation, for example, in event-related synchronization and desynchronization. The range of synchronization can be estimated using the similarity between neighboring alpha oscillations. Yet, little is known about how the synchronization range of alpha oscillations varies with alpha activation/inactivation over different brain regions. To examine this, we recorded human electroencephalography (EEG) during different tasks used to modulate alpha oscillations. We found that the synchronization range of posterior alpha oscillations was reduced in the activation phase compared to that in the inactivation phase. In contrast, the synchronization range of anterior alpha oscillations was enhanced in the activation phase compared to that in the inactivation phase. The results imply that the mechanisms generating anterior and posterior alpha oscillations may be different.
人类大脑中产生的阿尔法振荡长期以来一直是神经科学研究的对象。众多神经振荡器的同步振荡活动被认为是阿尔法振荡的基础。阿尔法振荡的振幅反映了同步程度，这种同步程度通常通过阿尔法激活和失活来调节，例如在事件相关同步和去同步过程中。同步范围可以通过相邻阿尔法振荡之间的相似性来估计。然而，关于阿尔法振荡的同步范围如何随不同脑区的阿尔法激活/失活而变化，我们所知甚少。为了研究这一点，我们在用于调节阿尔法振荡的不同任务期间记录了人类脑电图（EEG）。我们发现，与失活阶段相比，激活阶段后阿尔法振荡的同步范围减小。相反，与失活阶段相比，激活阶段前阿尔法振荡的同步范围增强。结果表明，产生前阿尔法振荡和后阿尔法振荡的机制可能不同。
