Well, I am sure Michael may have his own opinion.

As far as the study goes that you have presented, I don't think it is flawed.
I would think that if the part of the brain where concience and empathy and fear and all those types of emotionalities is small and under developed, obviously I should think that those certain cues would show a signifcant deficiency.

I believe that what they have found and will find as they continue to study this disorder as they call it, they will see that by shear intelligence alone and desire to fill a need would cause them to be able to intellectually master disguising the proper affect of emotionality.

Now if we go back to what I believe about how we are all primates and that it might have been there all along. Well, lets think about that, if there was a primate designed to lead and control without emotionality he would still have to be intelligent enough to express emotionality. When a lead primate is challenged, by another male primate, he will make the needed affects that he has learned to create the look of fear and concern in another primate that challenges him. And, just as well, he will provide the affect of desire to be groomed and tended to by the group.

And I think that it is also there in the females as in a primate group there is also a lead female presence that is stronger and holds the top position over the others.
So she too might have to have less emotionality for shear survival and the others would receive her signals of proper affect towards them allowing her to control.

If we look at how that applies to us and the rest of the world, well, I would guess that the same would be true for shear survival. And it may not just be for leadership, it may be for the ones needed to bear arms and fight with less emotionality. However as we have progressed, those that carry normal emotionalities could be convinced to do battle by shear driven emotionality that represents loyalty and even anger. So in that there is still a supply for a defence. But think about it, there still has to be some that can run the course without falling short because of emotionality.

In my opinion, I don't think the study is severely flawed. But I can see where one who is a psychopath and has intellectually learned the proper affects, might think it is flawed.

Psychopathy may not really be a design flaw, it may have been needed for survival.
We have so much to learn yet remember, we have only just begun.

That is my opinion ofcourse

Open Eyes