The experiment with drawing the letter 'E' on their foreheads seems like a huge leap to me. Some people who don't do spatial reasoning on a daily basis might not be able to even determine which way the letter should be drawn so that others could read it. My first instinct was to draw the letter so it was backwards to other people, but it would appear correctly in a mirror - because, I think, anytime I do something to my face, I'm looking in a mirror.
I would strongly expect that for the experiment to have any validity at all, the people in the group primed with feelings of power would be selected randomly. I don't see the connection with a propensity for being selected randomly, and a lack of skill with spacial reasoning.
My point: I think I have pretty good spatial reasoning capabilities, and it took a few seconds of thinking to figure out which way I should draw the letter on my own head for other people to read it. If I had to use reasoning - that is, rational thought - then I doubt their claim that people who were subconsciously thinking of their own power would also subconsciously draw the letter so it was easier for them to read.
