Fear Extinction and Predictive Trait-Like Inter-Individual Differences in Rats Lacking the Serotonin Transporter.

In fact, 22-kHz USV towards CS+ presentations showed a different time course than towards CS- presentations (TRIALxCS: F 2.305,87 = 3.016, p = 0.044, Figure S2B’ ), with CS+ presentations showing higher levels during the first trials than CS- presentations, albeit the decrease did not reach statistical significance at the level of CS+ and CS- presentations (CS+: T 86 = 0.752, p =0.454; CS-: T 86 = -0.295, p = 0.7699).

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