A. Chronic estradiol treatment – Ovx rats received two days of S.C. injections with vehicle or 50 ug/kg of estradiol benzoate (EB), and NOR and NOP was tested separately 48 h after the last dose. Entries are ratios (new/old + new) of time spent exploring each object (NOR) or objects in each location (NOP) for vehicle- and EB-treated subjects. Dotted line at 0.5 indicates spending the same amount of time exploring new and old objects or locations. ** P < 0.01 *** P < 0.001 by Mann-Whitney U-tests. Redrawn from Jacome et al [11].
B. Acute Estradiol treatment – Ovx rats received vehicle or 5 ug/kg (NOR) or 20 ug/kg (NOP) of estradiol immediately after a Training Trial. 4 h later NOR and NOP were separately tested. Data presented as in A. ** P < 0.01. Redrawn from Inagaki et al [14].