approached significancep = 0.061
Additionally, there was a significant effect of time across all groups (df=68, 0crit: t = 3.533 p = 0.001, 1crit: t = 2.038 p = 0.045, 2crit: t = 2.625 p = 0.011) except for the 3crit rats that nevertheless approached significance (t = 1.904 p = 0.061) (total active lever presses presented in Fig.