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. Author manuscript; available in PMC: 2013 Dec 6.
Published in final edited form as: Neuroscience. 2012 Aug 23;225:9–21. doi: 10.1016/j.neuroscience.2012.08.014

Figure 1. Effect of unpredictable shock stress (USS) in startle and contextual freezing behavior.

Figure 1

Four daily sessions of USS causes a significant long-lasting enhancement of baseline startle and contextual freezing in Sprague-Dawley rats. Six days after the last presentation of the USS (A) Mean baseline startle amplitude were enhanced significantly (P<0.05) and (B) percentage of time spent on contextual freezing behavior was increased significantly (P<0.001) as well.