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. 2012 Sep 21;7(9):e45720. doi: 10.1371/journal.pone.0045720

Figure 1. Three fear conditioning paradigms.

Figure 1

(A) Short-delay conditioning. (B) Long-delay conditioning. (C) Trace conditioning. Note that the interstimulus interval (ISI) is the same in the long-delay and the trace paradigms. The CS-US relationships are matched to those used in a related study [30]. The CS was a 70-dB, 22-kHz tone and the US was a 1-s, 0.8-mA footshock.