Earth View Deprivation also another concern?

Whenever people have been in space, they've been able to see earth. Maybe not for a few days when there's no windows, but they know its there. So what happens when that one object we always thought would be there isn't? Some people think it'll take its toll on astronauts. This article talks about how a base on the lunar pole in a crater would be a great controlled test site for seeing what happens, because they can't see earth for months at a time, and would only be able to look up into a vast nothingness while looking down at dusty old rocks.