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SHORT РЕРОЯТ$ А chemical signal in human female tears lowers aggression in males Shani Agron 63 Claire March Reut Weissgross, Eva Mishor, Lior Gorodisky, Tali Weiss, Edna Furman-Haran, Hiroaki Matsunemi Noam Published: December 21, 2023 Abstract Absiract introduction Rodent tears contain social chemosignals with diverse effects, including blocking male Results aggression. Human tears also contain a chemosignal that lowers male testosterone, out its Discussion behavioral significance was unclear. Because reduced testosterore is associated with reduced aggression, we tested the hypothesis that human tears act like rodent tears to block male Methods aggression. Using а standard paradigm, we found that sniffing emotional tears with no odor percept reduced human male aggression 43.7%. To probe the peripheral Supporting information substrates of this effect, we applied tears to 62 human olfactory receptors in vitro. We identified 4 receptors that responded in a dose-dependent manner to this stimulus. Finally, to probe the central brain substrates of this effect, we repeated the experiment concurrent with functional References brain imaging. We found that sniffing tears increased functional connectivity between the neural substrates of olfaction and aggression, reducing overall levels of 1eural activity in the latter. Reader Comments Taken together, our results imply that like in rodents, a human teer—-bound chemosignal lowers male aggression, a mechanism that likely relies on the structural and functional overlap in the Figures brain substrates of olfaction and aggression. We suggest that tears are a mammalian-wide mechanism that provides a chemical blanket protecting against
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