Centre for Cognition and Decision Making, National Research University Higher School of Economics, Moscow, Russian Federation.
Department of Psychology, National Research University Higher School of Economics, Moscow, Russian Federation.
Int J Psychophysiol. 2018 May;127:11-16. doi: 10.1016/j.ijpsycho.2018.02.014. Epub 2018 Feb 27.
Performance in the attentional blink task has been demonstrated to be directly influenced by alpha and beta neural oscillatory activity. In two experiments we stimulated the right parietal cortex and left frontal cortex with transcranial alternating current stimulation. For the first experiment we targeted only the right parietal cortex and found a non-significant increase in performance from 20 Hz stimulation. In the second experiment we applied two stimulators to the right parietal and left frontal cortex and found a significant increase in performance from 20 Hz tACS with a phase difference of 180°. Since low intensity stimulation has been shown to inhibit cortical excitability, and anti-phasic stimulation has been hypothesized to decrease presynaptic activation in one region and drive postsynaptic spikes in the other, we suggest that low intensity anti-phasic 20 Hz stimulation inhibited the parietal cortex, thereby disinhibiting the frontal cortex. This visual attention mechanism supposedly reduces processing of distractor stimuli and enhances processing of target stimuli. This study reveals that the frontal-parietal visual attention network may be modulated with low intensity 20 Hz anti-phase tACS.
注意力眨眼任务的表现已被证明受到α和β神经振荡活动的直接影响。在两项实验中，我们使用经颅交流电刺激刺激右顶叶皮层和左额叶皮层。在第一项实验中，我们仅靶向右顶叶皮层，发现 20Hz 刺激的表现有非显著增加。在第二项实验中，我们将两个刺激器应用于右顶叶和左额叶皮层，发现 20Hz tACS 具有 180°相移的表现有显著增加。由于低强度刺激已被证明抑制皮质兴奋性，并且反相刺激已被假设为降低一个区域的突触前激活并驱动另一个区域的突触后尖峰，因此我们建议低强度反相 20Hz 刺激抑制顶叶皮层，从而抑制额叶皮层。这种视觉注意力机制据称可以减少分心刺激的处理，增强目标刺激的处理。这项研究表明，低强度 20Hz 反相 tACS 可以调节额顶叶视觉注意网络。
