.pbs.org/wgbh/evolution/library/01/6/l_016_08.html">influence their mate choice. But many of these studies are subject to problems. “There’s a huge publication bias. We know that many interesting results will never be replicated,
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,” says Mats Olsson,
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, an experimental psychologist at the Karolinska Institute in Stockholm. “It’s a general problem in science. But in the pheromone field this has been a larger problem because the results have been so sensational.” In fact, Olsson says the field has become so controversial that he avoids using the term pheromone altogether,
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.
Replication aside,
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, Wyatt points out that none of the chemicals identified as human pheromones actually appear to be biologically relevant in humans. No putative pheromones have been isolated from a human secretion, synthesized and then put under human noses to produce reliable effects on behavior. “I saw good scientists being diverted on a wild goose chase,” Wyatt explains,
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, “devoting time and effort to studying molecules for which there was no basis.”
Consider the pig. One of the most oft-studied ?human pheromones is androstenone, a pheromone produced by male pigs that sends females into heat. It is also found in human sweat. It seemed logical that they would also be human pheromones.
But there’s more to sweat than pheromones. “There are thousands of chemicals in human armpits,
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,” Logan says. “We share some of them [with pigs] because we are mammals,
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, but they may not play a role in our behavior.” In the case of androstenone, genetic

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