Using Nonnaive Participants Can Reduce Effect Sizes
Using Nonnaive Participants Can Reduce Effect Sizes
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DOI：
10.1177/0956797615585115
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发表时间：
2015-07-01
影响因子：
8.2
通讯作者：
Ratliff, Kate A.
中科院分区：
文献类型：
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作者：
Chandler, Jesse;Paolacci, Gabriele;Ratliff, Kate A.
尽管研究人员经常假设他们的参与者对实验材料一无所知，但情况并非总是如此。我们研究了先前接触任务如何影响随后的实验结果。这项研究的参与者在两个时间点完成了同样的12项实验任务，首先是作为许多实验室复制项目的一部分，然后在几天，一周或一个月后再次完成。第二波的效应量明显低于第一波。当参与者在第二波中被分配到不同的条件时，这种减少最为明显。我们讨论了这些发现的方法学意义。
Although researchers often assume their participants are naive to experimental materials, this is not always the case. We investigated how prior exposure to a task affects subsequent experimental results. Participants in this study completed the same set of 12 experimental tasks at two points in time, first as a part of the Many Labs replication project and again a few days, a week, or a month later. Effect sizes were markedly lower in the second wave than in the first. The reduction was most pronounced when participants were assigned to a different condition in the second wave. We discuss the methodological implications of these findings.