I can absolutely believe that. Even in lab conditions, one's own personal thoughts can lead to all kinds of distractions. Even perfectly focussed minds might be

I can absolutely believe that. Even in lab conditions, one's own personal thoughts can lead to all kinds of distractions. Even perfectly focussed minds might be biased by certain conditioning, or a susceptibility to certain words. But I would like to see where the 5.5% figure comes from.