When It Comes to Moral Decisions, Testosterone Doesn’t Seem to Do Much

“The results of the current study yielded no evidence in support of any of the four preregistered hypotheses,” write the authors. Those given testosterone were no more likely to prefer taking action than those given the placebo. It was predicted that they’d also be more prone to make utilitarian judgements that minimize total casualties; this wasn’t true, either. Another hypothesis suggested that those given testosterone would be less sensitive to moral prohibitions, such as not choosing to kill someone. In fact, the results suggest the exact opposite is true.

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