What's the psychological basis for "Look at me when I'm talking to you"? If a person is talking to another person and the other person is looking away but still listening, many times I've seen people insist by saying:  


  "Look at me when I'm talking you"


or  

Gently saying 


  "Look at me"


Why does someone have to say that if the other person is listening anyway? What extra advantage does looking at a persons face have?
This article may help Basically if you look anywhere but at the speaker you can seem less attentive and looking at them shows you are paying attention to what they have to say

It is also one of a few primary elements in building rapport in those who you have just met and also to maintain rapport especially when listening to a problem the speaker has in a therapeutic or even business relationship.