Resting electroencephalogram alpha-power over posterior sites indexes baseline visual cortex excitability
Resting electroencephalogram alpha-power over posterior sites indexes baseline visual cortex excitability
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DOI：
10.1097/wnr.0b013e3282f454c4
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发表时间：
2008-01-22
期刊：
影响因子：
1.7
通讯作者：
Thut, Gregor
中科院分区：
文献类型：
--
作者：
Romei, Vincenzo;Rihs, Tonia;Thut, Gregor
振荡脑活动的变化与不同的功能状态有关，这取决于振荡的频率。在a波段（约8-14 Hz），振荡活动减少被认为反映了皮质兴奋性增强的状态，而活动增加则反映了皮质空闲或抑制的状态，其中兴奋性降低，但尚未直接探讨α/兴奋性的联系。在这里，我们研究了静息振荡活动和视觉皮层兴奋性之间的关系，使用脑电图和经颅磁刺激枕极的参与者。我们发现，个体后a波段功率与诱发错觉的个体阈值相关，经颅磁刺激诱导的视觉感知。这为a/兴奋性联系和视觉大脑的基线状态在个体之间的差异提供了直接支持。
Variations of oscillatory brain activity have been related to distinct functional states depending on the frequency of oscillations. In the a-band (about 8-14 Hz), decreased oscillatory activity is thought to reflect a state of enhanced cortical excitability, and increased activity to reflect a state of cortical idling or inhibition in which excitability is reduced, but the alpha/excitability link has not been probed directly. Here, we studied the relationship between resting oscillatory activity and visual cortex excitability across participants using electroencephalography and transcranial magnetic stimulation to the occipital pole. We found individual posterior a-band power to correlate with the individual threshold for eliciting illusory, transcranial magnetic stimulation-induced visual percepts. This provides direct support for an a/excitability link and for baseline states of the visual brain to vary across individuals.