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Menstrual Cycle Linked to London Prejudice
"Our findings suggest that women's prejudice, at least in part, may be a byproduct of their biology," said Melissa McDonald, a doctoral student and lead author on the paper.
The researchers conducted scientific studies with two groups of women that investigated how women's implicit attitudes toward men change across the menstrual cycle. They found that fertile women were more biased against men of different races and men of different social groups than men of their own group.
Importantly, though, the increase in bias occurred only for women who perceived the men as physically threatening, said Carlos David Navarrete, assistant professor of psychology and research team leader.
McDonald and Navarrete said their team's findings are consistent with the idea that women's prejudice may reflect the workings of an evolved psychological system that once functioned to protect them from sexual coercion, particularly when the costs are highest - that is, when women are fertile.
To minimize this threat, McDonald said, women might be more biased against men who have posed the greatest risk to their reproductive choice. Male strangers may have posed considerable risk of sexual coercion throughout human history, she said, as sexual aggression against women by male "invaders" has been a pervasive problem since ancient times.
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