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Variability leads to overestimation of mean summaries
Attention, Perception, & Psychophysics ( IF 1.7 ) Pub Date : 2021-03-26 , DOI: 10.3758/s13414-021-02269-2
Yelda Semizer , Aysecan Boduroglu

Research on ensemble perception has shown that people can extract both mean and variance information, but much less is understand how these two different types of summaries interact with one another. Some research has argued that people are more erroneous in extracting the mean of displays that have greater variability. In all three experiments, we manipulated the variability in the displays. Participants reported the mean size of a set of circles (Experiment 1) and mean length of horizontally placed (Experiment 2a) and randomly oriented lines (Experiment 2b). In all experiments, we found that mean size estimations were more erroneous for higher than smaller variance displays. More critically, there was a tendency to overestimate the mean, driven by variance in both task-relevant and task-irrelevant features. We discuss these findings in relation to limitations in concurrent summarization ability and outlier discounting in ensemble perception.



中文翻译:

变异性导致对均值摘要的高估

关于整体感知的研究表明,人们可以提取均值和方差信息,但了解这两种不同类型的摘要如何相互影响的知识就少得多。一些研究认为,人们在提取具有更大可变性的显示的均值时更加错误。在所有三个实验中,我们都控制了显示的可变性。参与者报告了一组圆的平均大小(实验1),水平放置的平均长度(实验2a)和随机排列的线(实验2b)。在所有实验中,我们发现均值大小的估计值要比较小的方差显示值更高。更重要的是,由于与任务相关和与任务无关的特征均存在差异,因此存在一种高估均值的趋势。

更新日期:2021-03-27
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