Testosterone increases honesty, study suggests

Posted by Dr. Michael White, Updated on January 5th, 2018
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ScienceDaily (Oct. 10, 2012) Testosterone is considered THE male hormone, standing for aggression and posturing. Researchers working with Dr. Armin Falk, an economist from the University of Bonn, have now demonstrated that this sex hormone surprisingly also fosters social behavior. In play situations, subjects who had received testosterone clearly lied less frequently than individuals who had only received a placebo.

The results have just been published in the Public Library of Science's international online journal PLoS ONE.

The hormone testosterone stands for typically male attributes -- it fosters the forming of the sexual characteristics, increases libido and muscle building. Women also have this sex hormone, but to a much lesser extent. "Testosterone has always been said to promote aggressive and risky behavior and posturing," reports Prof. Dr. Bernd Weber, a neuro-scientist from the Center for Economics and Neuroscience (CENS) at the University of Bonn. More recent studies indicate, however, that this sex hormone also fosters social behavior.

Cause-and-effect issues remains unresolved

"The disadvantage of many studies is, however, that they only correlate their subjects' testosterone level with their behavior," explains lead author Dr. Matthias Wibral, adding that this approach only reflects statistical links while not providing any insights into the causes for the behavior. "For testosterone does not only influence behavior; behavior, in turn, also influences hormone levels." Consequently, the CENS scientists were looking for an experimental approach that would also allow deducing cause and effect.

Bonn researchers using new approach

The scientists recruited a total of 91 healthy men for a behavioral experiment. Out of this group of subjects, 46 were treated with testosterone by applying it to the skin in gel form. On the following day, endocrinologists from the Bonn University Hospitals checked whether the blood testosterone levels were indeed higher in these subjects than in the placebo group. The other 45 test subjects only received a placebo gel. "Neither the subjects themselves nor the scientists performing the study knew who had received testosterone and who hadn't," reports Dr. Wibral. This was done to prevent behaviors from potentially being affected.

Games of dice with cheating option

This was followed by the behavioral experiments. The test subjects played a simple game of dice in separate booths. The higher their scores, the higher the amounts of money they received as a reward. "These experiments were designed such that the test subjects were able to lie," reports Prof. Weber. "Due to the separate booths, nobody knew whether they were entering their real scores into the computer, or higher ones in order to get more money." However, the scientists were able to determine later whether the various test subjects had cheated or not. "Statistically, the probability for all numbers on the dice to occur is identical," explains the neuroscientist. "So, if there are outliers in the higher numbers, this is a clear indication that subjects have been cheating."

Test subjects with higher testosterone levels lied less

The rest is here:

Testosterone increases honesty, study suggests

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