It's not at all about emotions, it's about one single emotion, fear. Does being less fearful make one a psychopath? There is a reason 99 % of people out there never get anywhere, and not just in trading, and that's because they are scared little sheep.
I'm not so sure I'd call a test using 41 people, 15 of which have brain damage, as being statistically conclusive. Show me multiple studies with a couple hundred people and I'll be a little more convinced.
Yes, any super succesful person would be a psychopath per the American Psych Association guidelines. I am a proud one! BIgbadass
Having less fear is generally a result of having low levels of the chemical MAO in the brain. A famous study of bull fighters discovered this unique fact. Low levels of MAO are found in most people who engage in extreme sports. The term adrenalin junkie is in fact the wrong term. There is even anti anxiety drugs that inhibit this chemical. They are often used to treat people who are agoraphobic or have similar type conditions. Runningbear