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. 2012 Oct 4;7(10):e46729. doi: 10.1371/journal.pone.0046729

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© 2012 Craig et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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The condition averages of group response rates are presented. The average of the control 0-0-0-0 group displays a subtle rise across conditions while the experimental groups do not display this increase during the second and third conditions. The removal of the delay intervals for the experimental groups induces a rise in response rate. The average of the baseline for the 0-10-10-0 group differs from the other groups due to one powerful “outlier” which dropped out mid-way through the second condition (visible in Figure S18).