Figure 1.

Percent change in endogenous OT release 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). Percent change in OT concentration was significantly lower for High-aggressive males (LMM: β = −0.22, SE = 0.10, t = −2.20, P = 0.04). Error bars represent standard error of the mean.

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