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. 2014 Jan 5;369(1633):20130151. doi: 10.1098/rstb.2013.0151

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© 2013 The Author(s) Published by the Royal Society. All rights reserved.

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Figure 4. — Chronic stress enhances the expression of auditory fear conditioning. (a) Outline of general behavioural procedures. (b) Mean percentage freezing in control (n = 12) and stress (n = 18) rats in the testing chamber (context B) before tone presentation (‘pre-tone’), which is followed by the three tones (CS1, CS2, CS3). (c) Percentage freezing averaged for all three tones (mean) in control (n = 12) and stress (n = 18) rats showing a significant enhancement in the expression of fear memory after chronic stress. Error bars are ± s.e.m.