Testosterone has long been the scapegoat for many bad choices. But is the hormone, responsible for aggression, really so influential in decision-making? That’s the question that researchers sought to answer in a new study that focuses on the relationship between testosterone and cognitive abilities. The paper, “Single Dose Testosterone Administration Impairs Cognitive Reflection in Men,” was authored by Wharton marketing professor Gideon Nave, Amos Nadler of the Ivey School of Business, David Zava of ZRT Laboratories and Colin Camerer of Caltech. It was recently published in the journal Psychological Science . Nave and Nadler spoke with Knowledge at Wharton about the research and its implications. An edited transcript of the conversation follows. Knowledge at Wharton: Tell us about what you studied and how you studied it. Amos Nadler: This study looks at testosterone, which is a sex hormone in the body.…