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One topic I found particularly interesting was understanding sexually dimorphic psychological adaptations in human females, especially in relation to disgust sensitivity. From an evolutionary psychology perspective, higher disgust sensitivity in females is likely an adaptation, because it may have helped reduce exposure to disease and toxins, which is especially important during pregnancy and child-rearing. Research suggests that women, on average, report stronger disgust reactions to things like spoiled food, bodily fluids, and contamination. This pattern makes sense evolutionarily, since avoiding pathogens would increase both maternal and offspring survival, making this trait more likely to be passed on over time rather than being a random byproduct.

This adaptation is sexually dimorphic because men generally show lower disgust sensitivity. A study by Curtis, Aunger, and Rabie (2004) found that disgust functions as a disease-avoidance system and is often stronger in females across cultures. Another study by Fessler et al. (2005) showed that disgust sensitivity increases during the first trimester of pregnancy, which supports the idea that it is biologically linked to reproductive needs. These findings suggest that differences in disgust are not just cultural, but tied to evolutionary pressures.

Question: If disgust sensitivity is evolved, can repeated exposure or modern environments significantly reduce these reactions over time?

Sources:
Curtis, V., Aunger, R., & Rabie, T. (2004). Evidence that disgust evolved to protect from risk of disease. Proceedings of the Royal Society B, 271(Suppl 4), S131S133.

Fessler, D. M. T., Eng, S. J., & Navarrete, C. D. (2005). Elevated disgust sensitivity in the first trimester of pregnancy. Evolution and Human Behavior, 26(4), 344351.

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Last week I was infatuated with the idea that breasts mimic Buttocks so I decided to read a critical review. I analyzed a critical review that synthesized existing research from m human evolution, hormonal biology, and primate comparisons. The authors acknowledged the purposes in which breasts served but ultimately the findings suggest that no single explanation can fully account for this trait. They rejected the idea that breasts evolved solely for sexual attraction which sort of goes against the mimicking theory. The authors proposed that breasts likely emerged as a byproduct of increased fat and hormonal changes linked to brain development and diet for a long time ago. They also argue that breasts may have been for sexual signaling, for example, indicators of health or fertility. Overall, the study argues that breast evolution is best understood as a multi-factor process which is basically what was discussed in class too.

References

Pawowski B, elaniewicz A. The evolution of perennially enlarged breasts in women: a critical review and a novel hypothesis. Biol Rev Camb Philos Soc. 2021 Dec;96(6):2794-2809. doi: 10.1111/brv.12778

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