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. Author manuscript; available in PMC: 2015 Sep 1.
Published in final edited form as: Neurobiol Learn Mem. 2013 Oct 29;113:165–173. doi: 10.1016/j.nlm.2013.10.014

Fig. 4.

Fig. 4

Fear-potentiated startle data for the Extinction Training (EXT), Extinction Test (TEST), Re-extinction (RE-EXT), and Reinstatement Test (REIN) sessions for the four experimental groups: (A) No Retrieval/No Keypad; (B) Retrieval/No Keypad; (C) No Retrieval/Keypad, and (D) Retrieval/Keypad. All groups showed significant extinction of fear-potentiated startle from EXT1 to EXT6. However, only the Retrieval/No Keypad group showed lower fear-potentiated startle to the reactivated CS+ (CS+a) compared to the non-reactivated CS+(CS+b) during Extinction Training. The two CS+ trials did not differ from each other in any of the other groups. There was higher fear-potentiated startle in the groups that used the Keypad compared to the No Keypad groups. All four groups showed a significant increase from the last block of Extinction Training (EXT6) to the Extinction Test (TEST), however there was also a significant main effect of Keypad group. Re-extinction (RE-EXT1 vs RE-EXT6) was only significant in the two groups that used a Keypad. None of the groups showed any effects of Trial Type, i.e. both CS+ were re-extinguished in the Keypad groups, and neither in the No Keypad groups. Significant reinstatement (RE-EXT6 vs REIN) was only observed in the No Retrieval/Keypad group, with no effect of Trial Type.