Are there lessons from negative results in studies using video playback?
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The use of video playback is a growing practice in animal behaviour. Studies that lead to unpredicted negative results are often considered failures and remain unpublished. In this article I review some of the published and unpublished studies that have led to negative results. Analysis of these studies suggests that no particular problem is responsible for more than a small number of negative results. I suggest further investigation of the potential causes of these negative results to assess their importance to the outcome of video playback experiments.
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