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. Author manuscript; available in PMC: 2010 May 15.
Published in final edited form as: Biol Psychiatry. 2009 Feb 26;65(10):887–892. doi: 10.1016/j.biopsych.2009.01.009

Figure 2.

Figure 2

Propranolol does not facilitate extinction learning or erase fear memory. Injection of propranolol (arrow) prior to partial extinction on day 2 led to a significant decrease in fear expression as measured by (A) percent freezing and (B) bar-press suppression. There were no differences between groups in further extinction sessions on day 3 and day 5. Two unpaired shocks on day 5 reinstated fear on day 6 equally in both groups. Data shown in blocks of 2 trials. (conditioning: Cond; extinction: Ext; reinstatement: Reinst; day 2: D2)