There must be a confounding variable: are you an engineer-type? What traits are correlated with overing? Do underers look at the world differently? And it is

There must be a confounding variable: are you an engineer-type? What traits are correlated with overing? Do underers look at the world differently? And it is a false dichotomy. Some people just don't care what direction when they replace the roll - what's a suitable name for that clade? And then there's the people who use the floor and ignore the holder.