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Memory and Recognition of a Non-Target During a Threat Detection Visual Search Task

机译：威胁检测视觉搜索任务期间非目标的内存和识别

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Context plays an important role in visual search tasks. The ability of people to form implicit associationsabout the objects in the world around them not only assists them in focusing their attention but also insimplifying their world. The goal of this study was to investigate whether, and how, people utilize"distractors" as contextual cues during a visual target search. Twenty undergraduate participants performeda luggage-screening task, where they were asked to locate a specific target (a knife). First, participants weretrained using 25 luggage images, each of which contained a target (i.e., knife) and a specific distractor (i.e.,iPod). During the post-training session, participants screened 100 bags with target base rate set at 50%.The bags contained either the distractor and the target (25 bags), the target only (25 bags), the distractoronly (25 bags), or neither the distractor nor the target (25 bags). Participants' dwell times and fixationcounts for specific areas of interest (AOI) were assessed across trial blocks. It was found that recognition ofthe distractor object increased across trials but the dwell time and number of fixations decreased as theexperiment progressed. These results demonstrate that participants were able to recognize the distractor andform an implicit association between its presence and the presence of the target. Results also indicated thatthe presence of the distractor ultimately biased participant response, creating more "liberal" responses overtime.
机译：上下文在视觉搜索任务中起着重要作用。人们形成隐性联想的能力 关于他们周围世界上的物体的信息不仅可以帮助他们集中注意力，而且可以 简化他们的世界。这项研究的目的是调查人们是否以及如何利用 “干扰因素”是视觉目标搜索过程中的上下文提示。 20名本科生参加了表演 行李检查任务，要求他们找到特定目标（一把刀）。首先，参与者是 使用25个行李箱图像进行训练，每个行李箱图像包含一个目标（即刀）和一个特定的干扰物（即 iPod）。在培训后的课程中，参与者筛选了100个袋子，目标基本率为50％。 袋子中包含干扰物和目标物（25袋），仅包含目标物（25袋），干扰物 仅（25袋），或既不分散注意力也不用目标（25袋）。参与者的停留时间和注视 在各个试验块之间评估特定关注领域（AOI）的计数。发现对 在整个试验中，牵张器的对象增加，但随着时间的延长，固定时间和注视次数减少 实验进行了。这些结果表明，参与者能够识别干扰物和 在它的存在与目标的存在之间形成隐式关联。结果还表明 干扰因素的存在最终使参与者的反应产生偏差，从而在 时间。

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