To switch or not to switch: Brain potential indices of attentional control after task-relevant and task-irrelevant changes of stimulus features
To switch or not to switch: Brain potential indices of attentional control after task-relevant and task-irrelevant changes of stimulus features
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DOI：
10.1016/j.brainres.2010.05.047
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发表时间：
2010-07-23
期刊：
影响因子：
2.9
通讯作者：
Berti, Stefan
中科院分区：
文献类型：
--
作者：
Hoelig, Cordula;Berti, Stefan
注意力是由感觉输入和自上而下过程的相互作用控制的。我们比较了任务切换和分心后重新定向期间的注意力控制过程。主要任务是区分横向和中央呈现的音调；这些刺激由频繁的标准音调或罕见的异常音调组成。在分心的情况下，音调无关紧要，可以忽略不计。在开关条件下，音调变化是相关的：每当出现异常音调时，参与者必须辨别其音调，而不是其方向。标准试验中的任务保持不变。在这两种情况下，异常者都会引发失配消极性（MMN）、P3a、P3b 和重新定向消极性（RON）。因此，我们认为分心和转换是由同一注意力控制系统触发的。此外，两种条件之间还可以观察到显着差异：在切换条件下，MMN 之后是更明显的 N2b 和 P3a。这些组件之间的差异支持这样的观点：在分心条件下，注意力的切换仅被启动但并未完全执行。 (C) 2010 Elsevier B.V. 保留所有权利。
Attention is controlled by the interplay of sensory input and top-down processes. We compared attentional control processes during task switching and reorientation after distraction. The primary task was to discriminate laterally and centrally presented tones; these stimuli were composed of a frequent standard or an infrequent deviant pitch. In the distraction condition, pitch was irrelevant and could be ignored. In the switch condition, pitch changes were relevant: whenever a deviant tone was presented, participants had to discriminate its pitch and not its direction. The task in standard trials remained unchanged. In both conditions, deviants elicited mismatch negativity (MMN), P3a, P3b, and reorienting negativity (RON). We, therefore, suggest that distraction and switching are triggered by the same system of attentional control. In addition, remarkable differences were observable between the two conditions: In the switch condition the MMN was followed by a more pronounced N2b and P3a. The differences between these components support the idea that in the distraction condition, a switch of attention is only initiated but not completely performed. (C) 2010 Elsevier B.V. All rights reserved.