Using Nonnaive Participants Can Reduce Effect Sizes.

@article{Chandler2015UsingNP,
  title={Using Nonnaive Participants Can Reduce Effect Sizes.},
  author={Jesse Chandler and Gabriele Paolacci and Eyal Peer and Pam Mueller and Kate A. Ratliff},
  journal={Psychological science},
  year={2015},
  volume={26 7},
  pages={1131-9}
}
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… CONTINUE READING
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