DDD, I was thinking exactly the same thing! I'm certainly not denying that mental illness is present in these children, but I live in a very old house and my DOGS have followed things that 'weren't there' with their eyes while they moved around the room, up the walls and across the ceiling! They did exactly what that baby was doing and once there were two of them watching the same thing at the same time, their little heads moving in perfect unison as they followed what ever it was! I watch the show about the Paranormal Children all the time and the difference between them and these children is that they all seem perfectly 'normal' and functioning otherwise, where these kids obviously do not. Maybe this is some type of combination of the two, where a child with some psychic abilities and sensitivities already also has a severe mental illness. So very sad for those kids and their families too, but fascinating all the same.
And I also can't help remembering when my daughter was a baby the same age as the girl they showed as a baby, the one staring at the ceiling. When my daughter did that, turned out she was having a seizure.