Figure 2.

Percent change in affiliative partner-directed behaviors in response to the front of the mirror (experimental condition) relative to responses to the back of the mirror (control condition). Comparisons were made between males who show high levels of partner-directed aggression (High-aggressive; N = 10) and males who display low levels of aggression (Low-aggressive; N = 10). High-aggressive males show a smaller percent increase in contact with partners (t = −2.26, P = 0.04) and a smaller percent increase in lip-smacking (t = - 2.32, P = 0.03) when exposed to the front of the mirror. Percent change in time spent in social proximity bouts of lip-smacking did not significantly differ between High-aggressive and Low-aggressive males. Percent change in time spent in social proximity was trending towards being lower for High-aggressive males when percent change in OT concentration from control was negative (t = 1.96, P = 0.07). Error bars represent standard error of the mean.

# indicates a trend (P ≤ 0.10) in interaction effect between percent change in OT and aggression

* indicates a significant (P < 0.05) main effect of aggression