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. Author manuscript; available in PMC: 2009 Jul 1.
Published in final edited form as: Neurobiol Learn Mem. 2008 Apr 22;90(1):200–216. doi: 10.1016/j.nlm.2008.02.009

Figure 9.

Figure 9

Differential fear conditioning to a 19 kHz USV and a 50 kHz USV. (A) Spectrograms of the 19 kHz USV (top) and the 50 kHz USV (bottom). (B) Overall mean percent freezing to the CS+ and the CS− (N = 20). (C) Mean percent freezing among subjects (n = 10) that received the 19 kHz USV (part A, top) as the CS+ and the 50 kHz USV (part A, bottom) as the CS−. (D) Mean percent freezing among subjects (n = 10) that received the 50 kHz USV as CS+ and the 19 kHz USV as CS−. The baseline level of freezing (before the CS onset) is plotted on the left of the vertical dashed line. Asterisks (*) denote significant differences between CS+ and CS−. Error bars represent ± 1 SE.