Figure 2.

Non-social behaviors exhibited by male prairie voles during partner-preference testing. A) Locomotor activity by males whose mates were tethered during initial 72 hours of a two-week cohabitation; by males who were themselves tethered during the early part of the cohabitation; and by males in which neither the male nor his mate were tethered during cohabitation. B) Amount of time spent in each part of a three-cage apparatus by males in each of the three groups described in (A). The asterisks indicate significantly less time spent in the empty cage or the stranger’s cage than in the cage containing the familiar partner (p < 0.02).