In recent years, the influence of cognitive effects and biases on users' thinking, behaving, and decision-making has garnered increasing attention in the field of interactive information retrieval. The decoy effect, one of the main empirically confirmed cognitive biases, refers to the shift in preference between two choices when a third option (the decoy) which is inferior to one of the initial choices is introduced. However, it is not clear how the decoy effect influences user interactions with and evaluations on Search Engine Result Pages (SERPs). To bridge this gap, our study seeks to understand how the decoy effect at the document level influences users' interaction behaviors on SERPs, such as clicks, dwell time, and usefulness perceptions. We conducted experiments on two publicly available user behavior datasets and the findings reveal that, compared to cases where no decoy is present, the probability of a document being clicked could be improved and its usefulness score could be higher, should there be a decoy associated with the document.

翻译：近年来，认知效应与偏差对用户思维、行为及决策的影响在交互式信息检索领域日益受到关注。诱饵效应（decoy effect）作为实证确认的主要认知偏差之一，指当引入一个劣于初始两个选项中某一项的第三方选项（即诱饵）时，用户对这两个选项的偏好会发生转移。然而，目前尚不明确诱饵效应如何影响用户与搜索引擎结果页面的交互行为及评价。为填补这一空白，本研究旨在探究文档层面的诱饵效应如何影响用户在搜索引擎结果页面上的交互行为，如点击、驻留时间及有用性感知。我们基于两个公开的用户行为数据集开展实验，结果表明：与无诱饵情况相比，若存在与某文档相关的诱饵，该文档被点击的概率可得到提升，且其有用性评分也可能更高。