(a) Representative traces of Schaffer collateral-hippocampal CA1 (SC-CA1) field excitatory postsynaptic potentials (fEPSPs) and (b) quantification of fEPSPs slopes following SC-CA1 pathway stimulation during wash-in with Saline (SAL; n = 11 slices), corticotropin-releasing factor (CRF; 125 nM; n = 12 slices), (2R,6R)-hydroxynorketamine (HNK; 15 μM; n = 11 slices) or combined CRF (125 nM) + (2R,6R)-HNK (15 μM) (n = 11 slices; two-sided one-way ANOVA followed by Holm-Sidak test; SAL vs HNK p = 0.0053, SAL vs CRF+ HNK p = 0.0003, CRF vs HNK p = 0.0043, CRF vs CRF + HNK p = 0.0002). Data are shown as mean ± S.E.M. ** p < 0.01. For detailed statistics information, see Supplementary Table 1.