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. Author manuscript; available in PMC: 2015 May 1.
Published in final edited form as: Exp Brain Res. 2014 Jan 31;232(5):1443–1458. doi: 10.1007/s00221-014-3829-9

Figure 1.

Figure 1

Experimental protocol. In both groups participants completed one-hour sessions, 12 hours apart, alternating between approximately 8–9 AM and 8–9 PM, over the course of 3 successive days and 2 nights. The APAPA group had the first of 5 sessions in the morning of the first day and the PAPA group had the first of 4 sessions in the evening of that day. Both groups had their last session on the morning of the third day. All participants completed the loud-tone protocol at their first 4 sessions and the fear conditioning and extinction protocol across the second night of the study.