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. Author manuscript; available in PMC: 2013 Jul 1.
Published in final edited form as: Behav Brain Res. 2012 Mar 28;232(2):395–399. doi: 10.1016/j.bbr.2012.03.031

Figure 1. Experimental design.

Figure 1

On day 1, subjects either underwent an “aversive experience” (5 unsignaled footshocks) or “context exposure” (no footshocks). On days 2 and 3, subjects were tested for context conditioning and reactivity to ultrasonic stimuli in counterbalanced order. The context test consisted of re-exposing subjects to the conditioning chamber. During the stimulus-presentation session, subjects were presented one of three stimuli in a novel chamber. The stimuli were a 22-kHz USV, a 22-kHz tone, or a 50-kHz USV. Freezing and vocalizations were measured throughout all stages.