Schematic illustration of the experimental design used in this study. All assayed adult F1 offspring experienced maternal treatment via their dams (in utero) exposure and an offspring treatment directly in the test apparatus. The sample size in each offspring treatment (RO/CO) of each maternal treatment (DW/RO/CO) was 12 per group (6M + 6F). DW, Distilled water; RO, Rabbit odor; CO, Cat odor; M, male offspring; F, female offspring; G, Gestation day; P, Postpartum day; D, Postnatal day.