Upper graphics display means (+S.E.M.) of the percentage of time spent exhibiting freezing in the contextual (A) and auditory (B) fear conditioning tests by subjects exposed to either muscimol (MUSC) or phosphate buffered saline (PBS) micro-infusion before conditioning training (*p<0.05).

<p>Lower graphics display means (- S.E.M.) of the actual time (in seconds) spent exhibiting freezing along 1-min consecutive Time Bins for subjects micro-injected with either phosphate buffered saline (PBS) or muscimol (MUSC) prior to training, in the contextual (C) and auditory (D) fear conditioning tests. Arrows indicate the moment of the auditory fear conditioning test in which the 5-s-duration CS was presented.</p