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. 2015 Apr 1;2(4):140381. doi: 10.1098/rsos.140381

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© 2015 The Authors.

© 2015 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 4. — Mean time spent in the compartment with images of either pain or neutral expressions of conspecifics during the test phase after habituating rats to the environment without images. The rats stayed longer in the compartment with images of neutral expressions than in that with pain expressions. Black bars indicate averaged staying time for pain expression; white bars indicate averaged staying time for neutral expression. Error bars represent s.e.m. *p<0.05.