How fixation durations are affected by search difficulty manipulations
How fixation durations are affected by search difficulty manipulations
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DOI：
10.1080/13506285.2022.2063465
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发表时间：
2022-04
期刊：
影响因子：
2
通讯作者：
Daniel Ernst;J. Wolfe
中科院分区：
文献类型：
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作者：
Daniel Ernst;J. Wolfe
摘要许多关于视觉搜索的眼动追踪研究都集中在注视次数和扫描路径的性质上。较少关注的是注视持续时间以及这些持续时间如何受到刺激特征的影响。先前的研究表明，在解释复杂刺激的搜索时间时，注视持续时间与注视次数一样重要（例如，寻找特定的面孔）。在本研究中，简单的刺激被用于搜索实验中，参与者寻找一个封闭的环之间的差距。我们操纵分心物异质性（DH），目标分心物相似性（TDS）和刺激密度（SDY，设置大小在一个恒定的搜索窗口），并估计这些因素的贡献凝视行为和试验搜索时间。结果表明，与以往的研究相比，固定持续时间的贡献较小的变化，在整体搜索时间与简单的搜索刺激更复杂的刺激。然而，固定持续时间仍然增加与DH，TDS，SDY。这些影响主要是加性的，我们没有发现DH和更紧密的元素间距之间的相互作用，在高水平的SDY，可能已经预期，因为DH和SDY影响分心物分组。
ABSTRACT Many eye tracking studies of visual search have focused on the role of the number of fixations and the nature of scan paths. Less attention has been paid to fixation durations and to how those durations are affected by stimulus features. Previous studies have shown that fixation durations can be as important as the number of fixations in explaining search times with complex stimuli (e.g., in search for specific faces). In the present study, simple stimuli were used in a search experiment where participants searched for a closed ring among rings with a gap. We manipulated distractor heterogeneity (DH), target-distractor similarity (TDS), and stimulus density (SDY, set size within a constant search window), and estimated the contributions of these factors to gaze behaviour and trial search time. The results show that fixation durations contribute less to variation in overall search time with simple search stimuli as compared to previous studies with more complex stimuli. However, fixation durations still increased with DH, TDS, and SDY. These effects were mainly additive, and we did not find an interaction between DH and closer element spacing at high levels of SDY that might have been expected since both DH and SDY influence distractor grouping.