Search asymmetry in periodical changes of motion directions
Search asymmetry in periodical changes of motion directions
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DOI：
10.1016/j.visres.2022.108025
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发表时间：
2022-03-03
期刊：
影响因子：
1.8
通讯作者：
Murakami，Ikuya
中科院分区：
文献类型：
--
作者：
Nakada，Hoko;Murakami，Ikuya
我们经常需要在动态环境中搜索对象。然而，对响应动态刺激输入的搜索过程的理解仍然有限，特别是对于我们视觉处理层次结构的中级阶段。在这项研究中，我们调查了在不断漂移的项目中搜索方向变化的项目之间是否观察到搜索不对称性以及在多大程度上观察到搜索不对称性，反之亦然。我们发现了显着的搜索不对称性，其中在不断漂移的干扰项中搜索方向变化的目标相当有效，而在方向变化的干扰项中搜索不断漂移的目标则效率极低。我们将这些结果与在颜色恒定的项目中搜索颜色变化的项目的其他情况进行比较，反之亦然。这些结果表明，方向性变化不是指导属性，但根据它们是否被指定为要发现的目标或要拒绝的干扰因素，对它们的处理方式有所不同；在后一种情况下，观察者很难将它们视为干扰因素。我们认为，显着的搜索不对称反映了在干扰物和目标之间做出决定时视觉系统暂时无法访问方向变化的时间段。
We often need to search for an object in a dynamic environment. However, there remains a limited understanding of search processes responding to dynamic inputs of stimuli, especially regarding the mid-level stages of our visual processing hierarchy. In this study, we investigated whether and to what extent search asymmetry is observed between a search for a directionally changing item among constantly drifting items and vice versa. We found a significant search asymmetry in which a search for a directionally changing target among constantly drifting distractors was fairly efficient, while a search for a constantly drifting target among directionally changing distractors was drastically inefficient. We compared these results with other cases of search for a color-changing item among color-constant items and vice versa. These results suggest that directional changes are not a guiding attribute, but they are processed differently depending on whether they are assigned as a target to be found or distractors to be rejected; in the latter case, observers have difficulty rejecting them as distractors. We propose that the significant search asymmetry reflects the period of time during which directional changes are temporarily inaccessible to the visual system when deciding between a distractor and a target.