Effects of neonatal treatment with MK-801 at p7–14 (A,B) (n = 15) and p11–15 (C,D) (n = 15) compared to the respective saline-treated mice (n = 13 for each saline-treated group) on sociability and social memory. Open bars represent saline-treated mice, while colored bars represent the nMK-801-treated mice. (A) In the sociability test, there was a significant effect of nMK-801 (p7–14) treatment (F(1,26) = 15.264, p = 0.001), but not effect of sex (F(1,26) = 3.809, p = 0.061) or sex*treatment interaction (F(1,26) = 0.013, p = 0.909). (B) In the social memory test, there was a significant effect of sex*treatment interaction (F(1,26) = 10.303, p = 0.003), but no effect of sex (F(1,26) = 0.962, p = 0.335) or nMK-801(p11–15) treatment interaction (F(1,26) = 2.084, p = 0.159). (C) In the sociability test, there was a significant effect of nMK-801 (p11–15) treatment (F(1,26) = 9.539, p = 0.004), but not effect of sex (F(1,26) = 0.998, p = 0.324) or sex*treatment interaction (F(1,26) = 4.103, p = 0.050). (D) In the social memory test here was a significant effect of treatment (F(1,26) = 22.061, p < 0.001), but not an effect of sex (F(1,26) = 0.831, p = 0.370) or sex*treatment interaction (F(1,26) = 4.073, p = 0.052). ***p < 0.001.