On the conditioning day (Day 1), mice received eight 0.8‐mA foot shocks (1 s in duration at 30 s intervals) by shock generator (ENV‐414; Med Associates) in the conditioning chamber (20 cm × 20 cm × 33 cm; LabDesign). After a 24‐h later (Day 2), mice were placed back into the same chamber without foot‐shock for 6 min. Freezing behavior was manually analyzed based on previous reports, 12 during each session, by training the experimenter.
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