Fig. 5

The effects of lactational PFOS exposure on social recognition in middle-aged period. In session 1 of the three-chamber social interaction test, both groups spent longer time on interacting with a novel mouse (stranger 1) than an empty box (A). In session 2, control mice spent longer time on interacting with another novel mouse (stranger 2) than the familiar mouse (stranger 1). However, there was no difference in interaction time between stranger 1 and 2 in PFOS group (B). ** and *** indicate p < 0.01 and 0.001, respectively, by unpaired t-test. Data are expressed as the mean \(\pm\) SEM. n = 9 mice in each group