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. 2014 Dec 22;9(12):e115222. doi: 10.1371/journal.pone.0115222

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© 2014 Wang, Chen

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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(a) The number of daily infusions obtained by rats that received 500 ppm CS₂ was significantly higher than all other groups. (b) The average number of infusions obtained during the last five sessions was compared between different oral cues. * p<0.05, Tukey HSD; ** p<0.01, Tukey HSD; ***: p<0.001, Repeated measures ANOVA.