SR: Vetandets Värld Myten om testosteron

Man gör medicinska försök på män med hänvisning till att de inte har ”hormonsvängningar” , samtidigt läser vi om testosteronstinna hannar som inte kan kontrollera sig. Hur hänger detta ihop? Den frågan fick vi från en lyssnare till Frågvis.

Reuters: Testosterone "prompts fair play, not aggression"

Testosterone makes people behave badly, but only because of our own prejudices about its effect, not its true biological action, scientists said on Tuesday.

A Swiss and British study found evidence that debunks the myth that testosterone causes aggressive, egocentric behavior, suggesting instead that the sex hormone can encourage fair play -- particularly if it improves a person's status.

Men with elevated testosterone levels show more affiliative behaviours during interactions with women

Testosterone (T) is thought to play a key role in male–male competition and courtship in many vertebrates, but its precise effects are unclear. We explored whether courtship behaviour in humans is modulated and preceded by changes in T. Pairs of healthy male students first competed in a non-physical contest in which their T levels became elevated. Each participant then had a short, informal interaction with either an unfamiliar man or woman. The sex of the stimulus person did not affect the participants' behaviour overall.

Gender differences in financial risk aversion andcareer choices are affected by testosterone

Women are generally more risk averse than men. We investigated whether between- and within-gender variation in financial risk aversion was accounted for by variation in salivary concentrations of testosterone and in markers of prenatal testosterone exposure in a sample of > 500 MBA students. Higher levels of circulating testosterone were associated with lower risk aversion among women, but not among men.

FoF: Testosteron stärker sinnet för rättvisa

Kvinnor som får en dos manligt könshormon beter sig mer rättvist i förhandlingar om pengar. Det visar ett nytt experiment.

Testosteron stärker sinnet för rättvisa

Testosteron gör råttor mer aggressiva och riskbenägna. Därför kan det ligga nära till hands att tro att hormo­net skulle ha ungefär samma effekt på människor.

– Men det stämmer inte, säger Christoph Eisenegger, hjärnforskare vid Universität Zürich i Schweiz.

Nature: Prejudice and truth about the effect of testosterone on human bargaining behaviour

Both biosociological and psychological models, as well as animal research, suggest that testosterone has a key role in social interactions. Evidence from animal studies in rodents shows that testosterone causes aggressive behaviour towards conspecifics. Folk wisdom generalizes and adapts these findings to humans, suggesting that testosterone induces antisocial, egoistic, or even aggressive human behaviours.

Nature: New evidence on testosterone and cooperation

In February 2010, Eisenegger et al. reported increased fair bargaining behaviour after administration of testosterone in an ultimatum game. However, unfair offers in the ultimatum game typically are rejected; thus, not only the motives for social cooperation but also the threat of financial punishment may have accounted for these effects.

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