Objectives: This study explores whether sex differences in reactive aggression (RA) and proactive aggression (PA) are attributable to sex, gender role orientation, or their interaction and explores the neuroanatomical characteristics of these sex differences. Methods: In a sample of 108 males and 126 females, we examined the sex-by-gender role orientation interaction on RA, PA, and brain gray matter volume (GMV). Then, we explored the relationship between aggression and regional GMV. Results: When the effects of sex and gender role orientation on aggression were disentangled, there were no sex differences in RA, regardless of gender role orientation. However, sex differences (male > female) in PA were observed within the masculine group but not within the feminine group. Brain imaging results revealed sex differences (male > female) on the right inferior frontal gyrus GMV, a region involved in cognitive control, within the masculine group. Moreover, a negative association between PA and the right inferior frontal gyrus GMV was observed in masculine females rather than masculine males. Conclusions: These findings indicate that gender role orientation has a more significant effect on aggression than sex, particularly with regard to PA, and hint that the goal of cognitive control involved in displaying PA differs in masculine males and masculine females.

There is a typographical error in the description of participant demographics in the original publication

Androgyny, characterized by high levels of both masculinity and femininity traits, is linked to adaptive psychological outcomes. However, existing research has typically examined these traits at the latent variable level, obscuring the specific trait facets that are central to androgynous development. Using network analysis, this study investigated the androgynous structure network at the level of trait facets to identify the most influential facets and explore sex-specific structures. A convenience sample of 1270 Chinese adolescents (M_age = 15.41, SD = 0.88; 611 females) completed the validated Chinese Sex-Role Inventory, which measures 32 facets of masculinity and femininity traits. In the full sample, “calm” exhibited the highest expected influence (EI = 1.11). Crucially, the masculinity facet “magnanimous” was the most powerful bridge to the femininity network (bridge EI = 1.56), particularly for males (bridge EI = 1.18); the femininity facet “thoughtful” (bridge EI = 0.97) was the most powerful bridge to the masculinity network, especially for females (bridge EI = 0.86). Significant sex differences were observed in global EI, with females showing greater global network activation (p = 0.008). The sex difference was additionally evident in “thoughtful” (male < female, p = 0.022) and “magnanimous” (male > female, p = 0.043). Such findings highlight the pivotal roles of “magnanimous” for males and “thoughtful” for females in fostering androgyny. The study advances the understanding of androgyny by delineating its facet-level structure and underscores the value of sex-specific strategies in fostering balanced gender-typed trait development. The convenience sample may limit the generalizability of these findings.

Although previous behavioral studies have associated reactive aggression (RA) and proactive aggression (PA) with traditional masculinity, further investigation is needed into the traditional masculinity-linked neuroanatomical characteristics of RA and PA. This study analyzed the traditional masculinity-by-aggression interaction in 705 participants (355 men) by measuring grey matter volume (GMV). We have expanded on previous studies and found that traditional masculinity was not associated with RA and PA when not controlled for traditional femininity. However, the association appeared when controlling for it. Furthermore, we found significant traditional masculinity-by-RA interactions on the GMV in the bilateral superior frontal gyrus, a region known to be involved in cognitive control. When traditional masculinity scores were 1 standard deviation above the mean, there was a positive correlation between RA and the GMV in the bilateral superior frontal gyrus. Conversely, when traditional masculinity scores were 1 standard deviation below the mean, there was a negative correlation between RA and the GMV in the region. However, no traditional masculinity-linked neuroanatomical characteristics of PA were found. The results indicated that individuals with high/low traditional masculinity perceived RA as a different outcome (gain or loss) of self-control. The results supported an opportunity to develop prevention or intervention strategies for RA.