Interesting study. It doesn't really mention whether or not the men in question had undergone HRT at all prior to the study, though one can assume that they did not during the 8 week prep period. I would imagine that is mentioned within the full text of the study. It will be fascinating to see if they continue this line of study, and just how much of the difference in emotional processing is due to hormone induced changes over time and how much is an innate difference in the way the brain is structured from birth. I would imagine that like most things, it's a combination of the two.
Also, it's really hard to think about a scientific study with your avatar. 🙂