The time course of distractor-based response activation with predictable and unpredictable target onset
The time course of distractor-based response activation with predictable and unpredictable target onset
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DOI：
10.1007/s00426-019-01149-7
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发表时间：
2019-03-01
影响因子：
2.3
通讯作者：
Jacobsen, Thomas
中科院分区：
文献类型：
--
作者：
Jost, Kerstin;Wendt, Mike;Jacobsen, Thomas
在时间侧侧任务（即，干扰物先于目标）中的电生理记录表明，干扰物处理是根据干扰物的整体效用进行调整的。在高效用条件下，即干扰物对目标/反应具有预测性，干扰物立即激活相应的反应（如偏侧准备电位LRP所示）。当可预测的目标发生延迟时，这种激活被证明是明显延迟的。为了研究目标启动不可预测条件下分心物相关反应激活的发生和时间过程，我们在分心物和目标之间随机改变刺激启动异步（SOA），并记录分心物诱发的LRP。当分心物效用高时，LRP在分心物呈现后不久发生。在长期SOA的情况下，该LRP的时间过程的特点是回落到基线，随后重新激活，在目标开始之前达到相当大的水平。这些结果表明，干扰物加工的特点是对任务的经验效用和时间限制进行复杂的调整，以及调节过早反应激活的进一步控制过程。
Electrophysiological recording in a temporal flanker task (i.e., distractors preceding the targets) has demonstrated that distractor processing is adjusted to the overall utility of the distractors. Under high utility, that is, distractors are predictive of the target/response, distractors immediately activate the corresponding response (as indicated by the lateralized readiness potential, LRP). This activation has been shown to be markedly postponed when the target predictably occurs delayed. To investigate the occurrence and time course of distractor-related response activation under conditions of unpredictable target onset, we randomly varied the stimulus-onset asynchrony (SOA) between distractors and targets and recorded the distractor-evoked LRP. When the distractor utility was high, an LRP occurred shortly after distractor presentation. In case of a long SOA the time course of this LRP was characterized by a drop back to baseline and a subsequent re-activation that reached a substantial level before target onset. These results suggest that distractor processing is characterized by sophisticated adjustments to experienced utility and temporal constraints of the task as well as by further control processes that regulate premature response activation.