A couple of points: 1) As far as interviews are concerned (or any dialogue) mirroring might get you further than power -- eg: when your interviewer crosses his/her arms, you might gain an advantage doing the same - whatever the "power poses" theory says. I suppose it is like language: Short, conscience sentences might be "powerful" or "commanding" -- but that alone doesn't make for effective prose in all cases. No co…
Actually, I wonder if you could even pull of that version of the experiment without the participants seeing through it ("No really, shrinking into your chair and looking at the floor is a great display of power!").