Recent event‐related potential (ERP) studies have suggested that the N140cc component reflects target selection mechanisms in tactile search tasks in which the target is presented simultaneously with homogeneous distractors. To investigate if and how the attentional selection of the tactile target is affected by the presence of a singleton distractor, we presented a four‐item search array (two stimuli to the middle and index fingers of the left and right hand) which included a singleton distractor in addition to the target and two other homogenous distractors. Participants had to localize the target (top or bottom finger on either hand), while ignoring all distractors. Behavioral results revealed that the target localization was hindered by the presence of the singleton distractor as demonstrated by distractor‐presence costs for both speed and accuracy. ERP results confirmed that attention was directed to the singleton distractor when this was the only singleton item in the array as suggested by the presence of a distractor‐related N140cc component on distractor only trials. Furthermore, when target and singleton distractor were presented to opposite hands (contralateral distractor trials) the target‐related N140cc amplitude was reduced as compared to target only trials, suggesting reduced attentional resources to the target. However, when target and singleton distractor were presented to the same hand (ipsilateral distractor trials), the N140cc amplitude was comparable to that observed on target only trials. These findings suggest that the N140cc reflects the attentional selection of the target side rather than the competition between stimuli presented to the same hand.

中文翻译：

---

触觉搜索任务中注意选择的电生理相关性：单身干扰物对目标选择的影响。

最近的事件相关潜能（ERP）研究表明，N140cc组件反映了触觉搜索任务中的目标选择机制，其中目标与同构干扰物同时显示。为了研究单身干扰物的存在是否会影响触觉目标的注意力选择以及如何影响其注意力选择，我们提出了一个四项搜索数组（左右手的中指和食指有两个刺激），其中包括一个单身除目标物和其他两个同质干扰物之外的干扰物。参与者必须定位目标（两只手的食指或食指），而忽略所有干扰因素。行为结果表明，单调干扰器的存在阻碍了目标的定位，如速度和准确性方面的干扰器存在成本所证明的那样。ERP结果证实，当单排骨牵开器是阵列中唯一的单项时，就将注意力转移到了单排骨牵开器上，这是由单排骨牵开器试验中存在与排骨相关的N140cc成分所暗示的。此外，当目标对象和单身干扰者出现在相反的手上时（对侧干扰物试验），与目标相关的N140cc振幅相比，仅目标试验降低了，提示对目标的注意力资源减少了。但是，当目标和单例牵张器同时出现时（同侧牵张器试验），N140cc振幅可与仅目标试验中观察到的振幅相媲美。