Evidence suggests that the N140cc component of event-related potentials (ERP) observed in tactile search tasks reflects the attentional selection of the target. Here, we investigated whether the target selection processes are affected by the separation between the target and an ipsilateral singleton distractor (singletons delivered to contiguous or non-contiguous fingers of the same hand). In addition, the external distance between search items was varied through posture (splayed or touching fingers). Accuracy improved when target and distractor were delivered to contiguous fingers that were also touching. Regardless of target-distractor separation, the N140cc was larger when the external distance between search-array stimuli decreased (touching fingers). Importantly, a smaller N140cc was observed at reduced target-distractor separations, suggesting a narrower attentional focus for contiguous singletons. These findings reveal that the mechanisms responsible for tactile target selection in the presence of an ipsilateral singleton distractor are fundamentally different from those emerged in vision.

证据表明，在触觉搜索任务中观察到的事件相关电位（ERP）的N140cc成分反映了目标的注意选择。在这里，我们调查了目标选择过程是否受目标与同侧单例干扰物（传递给同一只手的连续或不连续手指的分离）之间的距离的影响。此外，搜索项之间的外部距离因姿势（手指张开或触摸）而异。将目标物和干扰物传送到也接触的连续手指时，准确性得到了提高。无论目标与干扰物的分离如何，当搜索阵列刺激之间的外部距离减小（触摸手指）时，N140cc都会更大。重要的是，在减少目标-干扰物分离的情况下，观察到较小的N140cc，提示对连续单身人群的关注点缩小了。这些发现表明，在同侧单例牵开器存在下负责触觉目标选择的机制与视觉中出现的机制根本不同。