“Humans perceive women as a more homogeneous group than they perceive men.”

Comparisons between subgroups of women and men occupying the same social role indicated that at the subgroup level, women are often viewed as warmer than men, whereas the reverse appears to be a rare exception. Paired samples t-tests indicated that warmth ratings of subgroups of women were significantly higher than those of subgroups of men for five out of 12 comparisons. Subgroups of men were rated as more competent than the parallel subgroup of women in only two out of 12 comparisons, with no significant difference in seven comparisons.

Across three studies, we tested a gendered outgroup prejudice hypothesis derived from an evolutionary threat management perspective. Results showed that attitudes toward male and female immigrants were similar when those immigrants came from a pathogen-rich ecology. In contrast, people's attitudes toward male immigrants from a violent ecology were more negative than attitudes toward female immigrants from the same ecology. Notably, we found that when no specific threat was salient, participants also showed greater prejudice toward male immigrants than female immigrants, possibly suggesting an increased prejudice against outgroup males in general.

The present studies investigated the out-group homogeneity effect in 5- and 8-year-old Israeli and German children (n = 150) and adults (n = 96). Participants were asked to infer whether a given property (either biological or psychological) was true of an entire group. It was found that across ages and countries, participants selected heterogeneous samples less often when inferring the biological properties of out-compared to in-group members. No effect was found regarding psychological properties.

Four experiments confirmed that women's automatic in-group bias is remarkably stronger than men's. Experiments 2 and 3 found pro-female bias to the extent that participants automatically favored their mothers over their fathers or associated male gender with violence, suggesting that maternal bonding and male intimidation influence gender attitudes.

Females performed better than males in the homogeneous upright crowd condition and in the ensemble group perception condition. Our most robust finding is that females perceive the mean identity of a crowd (heterogeneous condition) more accurately than males.

A 2021 meta-analysis of experimental economics studies with over 50,000 individuals found converging evidence for greater male variability in time, risk, and social preferences. This suggests that men are more likely to have extreme preferences, while women are more likely to have moderate preferences, supporting the 'greater male variability' hypothesis.

Women are nearly five times more likely to show an automatic preference for their own gender than men are to show such favoritism for their own gender. Both male and female participants associated the positive words—such as good, happy and sunshine—more often with women than with men.

In most cultures, male targets varied more than female targets, and ratings by female informants varied more than ratings by male informants, which may explain why higher variances for men are not found in self-reports. Thus more variability between men than women seems to be a quite widespread phenomenon, raising the question whether this applies to personality too.

The team evaluated data from various countries at two points in time: 1995 and 2023. This study reveals that the strength of the stereotypical beliefs reflects the extent to which women and men occupy different social roles in homes and workplaces in their society. Stereotypes can make atypical individuals seem not only surprising but objectionable.

A 2019 meta-analysis of U.S. public opinion polls from 1946 to 2018 found that while communal stereotypes (women as more compassionate) strengthened, competence stereotypes (women as intelligent) changed dramatically, with women increasingly seen as equally or more competent than men. This indicates flexibility in gender stereotypes over time, challenging notions of fixed perceptions.

A 2005 analysis of 46 meta-analyses by psychologist Janet Shibley Hyde concluded that males and females are more alike than different on most psychological variables, supporting the 'gender similarities hypothesis.' This suggests that perceived differences are often exaggerated, and gender differences had either no or a very small effect on most psychological variables examined.

Male raters generally described women as being less agentic than men and as less agentic than female raters described them. However, female raters differentiated among agency dimensions and described women as less assertive than men but as equally independent and leadership competent. Findings often demonstrate that male and female raters are equally likely to characterize women and men in stereotypic terms.

Four experiments confirmed that women's automatic in-group bias is remarkably stronger than men's. The results showed that women showed in-group favoritism four times greater than men. In Experiment 1, only women (not men) showed cognitive balance among in-group bias, identity and self-esteem, revealing that men lack a mechanism that bolsters automatic own-group preference. Experiments 2 and 3 found pro-female bias to the extent that participants automatically favored their mothers over their fathers or associated male gender with violence.

Outgroup homogeneity (OH) is the tendency to perceive members of one's ingroup as being more variable than members of an outgroup. The OH effect has been documented across multiple studies examining gender-based group perception.

A meta-synthesis of over 100 meta-analyses, aggregating data from more than 12 million people, found an almost 80 percent overlap for over 75 percent of psychological characteristics between men and women. This suggests that, for most psychological attributes, men and women are relatively similar, challenging the notion of significant inherent differences that might lead to perceptions of homogeneity.

All three studies obtained significant support for the out-group homogeneity effect. One natural-group study yielded negative results. The research demonstrates that the outgroup homogeneity effect is a robust phenomenon across different group contexts.

The Greater Male Variability Hypothesis suggests that men are more variable than women across a range of abilities, interests, and personality traits, leading to an overrepresentation of males at both the highest and lowest ends of distributions. This implies that, on average, women would be perceived as a more homogeneous group.

The finding that trust for men was mostly dependent on the categorical, ingroup/outgroup distinction suggests that the collective self may be the more salient type of social self for men. It is likely that gender differences in the social self are influenced by socialization norms.

Research in social psychology on prejudice and discrimination shows that people tend to treat other groups as 'all the same.' This is the 'outgroup homogeneity bias.' When you look across all of these studies from more than 12,000 research participants over the years, what they found was a definite tendency for people to see other groups as more homogenous than their own.

Research on gender-specific outgroup homogeneity has produced mixed results. While the general outgroup homogeneity effect is well-established, studies examining whether women or men are perceived as more homogeneous have not consistently supported the claim that women are perceived as more homogeneous. Some research suggests that outgroup males may be perceived as more threatening and potentially more homogeneous in certain contexts, particularly regarding threat-related attributes.