FIGURE 4. Partner preference test after eticlopride pretreatment.

a, Eticlopride blocked partner preference in the V1aR-vp group. V1aR-vp, Ctrl-vp and Ctrl-other animals did not spend significantly more time with either the partner (filled columns) or the stranger (open columns) (P > 0.05, Student's t-test). Error bars, standard error. b, A plot of the percentage of time spent with the partner for each subject shows a similar distribution between control and V1aR-vp groups, with no significant difference from that expected by random chance (P > 0.05, ² analysis).