There's been a few studies on this. Some for positioning, others for slightly less comfortable things like this [0]. [0] http://people.csail.mit.edu/fadel/wivi

There's been a few studies on this. Some for positioning, others for slightly less comfortable things like this [0]. [0] http://people.csail.mit.edu/fadel/wivi/ http://people.csail.mit.edu/fadel/wivi/