Occipital alpha power reveals fast attentional inhibition of incongruent distractors
Occipital alpha power reveals fast attentional inhibition of incongruent distractors
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DOI：
10.1111/psyp.13011
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发表时间：
2018-03-01
期刊：
影响因子：
3.7
通讯作者：
Verguts, Tom
中科院分区：
文献类型：
--
作者：
Janssens, Clio;De Loof, Esther;Verguts, Tom
最近的关联模型的认知控制假设，认知控制可以学习（优化）的任务特定的设置通过感知，电机和控制表示之间的关联，一旦学会，控制可以迅速实施。中额叶脑区发出控制需要的信号，随后通过偏置感觉表征，促进或抑制处理任务相关或任务无关信息的脑区的活动来实现控制。为了评估这个过程的时间尺度，我们采用了EEG。为了查明控制实施在特定的感觉领域，我们使用了侧翼任务与不一致的侧翼显示在只有一个hemifield（一致的侧翼在其他hemifield）隔离他们的处理在对侧半球。ERPs显示快速调制，特别是在视觉处理区对侧的不一致的侧翼。为了测试这些调制是否反映了增加或减少处理不一致的侧翼，我们调查了阿尔法功率，注意力抑制的标志。重要的是，我们显示增加的阿尔法功率在视觉领域处理不一致的侧翼从300至500毫秒刺激后发作。这表明快速认知控制的注意力抑制信息破坏目标导向的行动。此外，我们发现，中额θ在审判中的早期也调制的不一致性，θ功率预测随后的α功率调制。这支持了这一假设，即中额不一致检测导致控制的实施，并揭示了这些机制发生在一个快速的，在审判的时间尺度。
Recent associative models of cognitive control hypothesize that cognitive control can be learned (optimized) for task-specific settings via associations between perceptual, motor, and control representations, and, once learned, control can be implemented rapidly. Midfrontal brain areas signal the need for control, and control is subsequently implemented by biasing sensory representations, boosting or suppressing activity in brain areas processing task-relevant or task-irrelevant information. To assess the timescale of this process, we employed EEG. In order to pinpoint control implementation in specific sensory areas, we used a flanker task with incongruent flankers shown in only one hemifield (congruent flankers in the other hemifield) isolating their processing in the contralateral hemisphere. ERPs revealed fast modulations specifically in visual processing areas contralateral to the incongruent flankers. To test whether these modulations reflect increased or decreased processing of incongruent flankers, we investigated alpha power, a marker for attentional inhibition. Importantly, we show increased alpha power over visual areas processing incongruent flankers from 300 to 500 ms poststimulus onset. This suggests fast cognitive control by attentional inhibition for information disrupting goal-oriented actions. Additionally, we show that midfrontal theta earlier in the trial is also modulated by incongruency, and that theta power predicts subsequent alpha power modulations. This supports the hypothesis that midfrontal incongruency detection leads to control implementation, and reveals that these mechanisms take place on a fast, within-trial timescale.