(A, B, C) Time spent in the closed arm of the elevated plus maze (n = 20, 16, 20, and 20 male offspring from 4–5 litters and 20, 16, 20, and 16 female offspring from 4–5 litters for control+IgG, control+TNFα antibody, PE+IgG, and PE+TNFα antibody groups, respectively); (B) social quotient, calculated as (time spent in the social chamber - time spent in the non-social chamber)/time spent in the middle chamber, in the three-chamber test (n = 16 offspring from 4 litters per sex per group); (C) total travel distance in the open-field test (n = 20 male offspring from 5 litters per group; n = 24, 20, 24, and 16 female offspring from 4–6 litters for control+IgG, control+TNFα antibody, PE+IgG, and PE+TNFα antibody groups, respectively). Data are presented as the mean ± s.e.m. NS, P ≥ 0.05; **, P < 0.01; ***, P < 0.001, versus control+IgG. One-way ANOVA, Tukey’s HSD.