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Pulsed Out of Awareness: EEG Alpha Oscillations Represent a Pulsed-Inhibition of Ongoing Cortical Processing

机译:意识不到的脉冲:脑电图阿尔法振荡代表正在进行的皮层加工的脉冲抑制。

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摘要

Alpha oscillations are ubiquitous in the brain, but their role in cortical processing remains a matter of debate. Recently, evidence has begun to accumulate in support of a role for alpha oscillations in attention selection and control. Here we first review evidence that 8–12 Hz oscillations in the brain have a general inhibitory role in cognitive processing, with an emphasis on their role in visual processing. Then, we summarize the evidence in support of our recent proposal that alpha represents a pulsed-inhibition of ongoing neural activity. The phase of the ongoing electroencephalography can influence evoked activity and subsequent processing, and we propose that alpha exerts its inhibitory role through alternating microstates of inhibition and excitation. Finally, we discuss evidence that this pulsed-inhibition can be entrained to rhythmic stimuli in the environment, such that preferential processing occurs for stimuli at predictable moments. The entrainment of preferential phase may provide a mechanism for temporal attention in the brain. This pulsed inhibitory account of alpha has important implications for many common cognitive phenomena, such as the attentional blink, and seems to indicate that our visual experience may at least some times be coming through in waves.
机译:阿尔法振荡在大脑中无处不在,但是它们在皮层加工中的作用仍是一个有争议的问题。近来,已经开始积累证据来支持α振荡在注意力选择和控制中的作用。在这里,我们首先回顾证据,大脑中的8–12 Hz振荡在认知过程中具有一般的抑制作用,重点在于它们在视觉过程中的作用。然后,我们总结了支持我们最近的提议的证据,即α代表正在进行的神经活动的脉冲抑制。正在进行的脑电图的阶段可以影响诱发的活动和随后的处理,我们建议α通过交替的抑制和激发微观状态发挥其抑制作用。最后,我们讨论了这种脉冲抑制作用可以被带入环境中的节律性刺激的证据,从而在可预见的时刻对刺激进行优先处理。优先相的夹带可能提供大脑中暂时注意的机制。这种对α的脉冲抑制性解释对许多常见的认知现象(例如注意眨眼)具有重要意义,并且似乎表明我们的视觉体验可能至少在某些时候呈波浪形。

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