In the summer of 2005 two Cambridge University neuroscientists set up shop on a midsize trading floor in the City of London. For a little more than a week they took saliva samples twice a day from 17 male traders who specialized in German interest rate futures, and measured the daily fluctuations in their testosterone and cortisol levels. (Excess cortisol, produced by the adrenal cortex, tends to indicate heightened stress levels.)
The neuroscientists, John Coates and Joe Herbert, discovered what even those of us with only cursory backgrounds in brain chemistry might have guessed. On days when the traders did well, their testosterone levels rose. On days characterized by market volatility and uncertainty, cortisol production spiked.
Sure, any guy knows what it is like to feel your testosterone surging after accomplishing such manly feats as hitting a home run, bringing down a woolly mammoth with your handmade spear, kissing an attractive woman or writing a really killer blog post
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