“Looking at faces is quite mentally demanding,” Dr Doherty-Sneddon told the BBC News website.
“We get useful information from the face when listening to someone, but human faces are very stimulating and all this takes processing.
“So when we are trying to concentrate and process something else that’s mentally demanding, it’s unhelpful to look at faces.”
I do this, and often struggle to convince people that I am focused on what they’re saying. And now I know I’m just embracing my inner eight year old.
On a related note, I also stare at people’s mouths when they’re talking. On more than one occasion I’ve been asked if I’m partially deaf.