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. Author manuscript; available in PMC: 2014 Apr 1.
Published in final edited form as: Behav Brain Res. 2013 Jan 4;242:142–149. doi: 10.1016/j.bbr.2012.12.050

Figure 5. Isolation-reared rats do not display sensitized responses to auditory cues alone.

Figure 5

A) Rats were presented with the same observational fear conditioning procedure in the absence of footshock. Observer rats did not display increased freezing over the course of auditory tone presentation trials. B) When tested after one day, neither pair-housed nor isolation-reared observer rats displayed evidence of increased responding to the tone. Black represents pair-housed observer, white represents isolation-reared observer.