van Noordt Stefon J R, Desjardins James A, Gogo Cody E T, Tekok-Kilic Ayda, Segalowitz Sidney J
Cognitive and Affective Neuroscience Laboratory, Department of Psychology, Brock University, St. Catharines, ON, Canada L2S 3A1.
Cognitive and Affective Neuroscience Laboratory, Department of Psychology, Brock University, St. Catharines, ON, Canada L2S 3A1; Developmental Neuroscience Laboratory, Department of Child and Youth Studies, Brock University, St. Catharines, ON, Canada L2S 3A1.
Neuroimage. 2017 Jan 15;145(Pt A):82-95. doi: 10.1016/j.neuroimage.2016.09.054. Epub 2016 Sep 22.
The oscillatory dynamics of medial frontal EEG theta and posterior alpha are implicated in the modulation of attention and cognitive control. We used a novel saccade cueing paradigm to examine whether theta and alpha are modulated by task difficulty during response preparation. After isolating and functionally classifying medial frontal and posterior alpha independent components, the EEG spectral power in these components was calculated on pro- and anti-saccade trials prior to response probes. The results of bootstrap re-sampling show that, compared to pro-saccade trials, correct anti-saccades are characterized by an increase in medial frontal theta and suppression of posterior alpha during the response preparation period. Furthermore, an absence of increased medial frontal theta prior to anti-saccades probes occurs on error trials, that is, a failure to control pre-potent eye movements. For these error trials, a burst in medial frontal theta is instead observed following error feedback. Our findings show that enhanced medial frontal theta is linked not only to dynamic cognitive control that is reactive (such as, after error commission), but is also an important prerequisite for success when behavioral control is challenged.
内侧额叶脑电图θ波和后部α波的振荡动力学与注意力和认知控制的调节有关。我们使用了一种新颖的扫视提示范式来研究在反应准备期间，θ波和α波是否会受到任务难度的调节。在分离并对内侧额叶和后部α独立成分进行功能分类后，在反应探测之前的顺向和逆向扫视试验中计算这些成分的脑电图频谱功率。自举重采样的结果表明，与顺向扫视试验相比，正确的逆向扫视在反应准备期间的特征是内侧额叶θ波增加和后部α波受到抑制。此外，在错误试验中，即未能控制优势眼动时，逆向扫视探测之前内侧额叶θ波没有增加。对于这些错误试验，在错误反馈之后反而观察到内侧额叶θ波的爆发。我们的研究结果表明，增强的内侧额叶θ波不仅与反应性的动态认知控制（例如，在犯错之后）有关，而且在行为控制受到挑战时也是成功的重要前提。
