I believe it was NASA decades ago that discovered that human beings are poor monitors of automation. It's better to have the automation monitoring the humans.
Think of the nuclear incidents at Three Mile Island and Chernobyl. The operators didn't react until things had become critical - but like a "factor of disbelief".
I also recall at an early CRM course in the early 1980s that a symptom of loss of situational awareness (ie not being totally aware of what is going on around you) is an intuitive feeling that things are not quite right but not knowing exactly what's wrong. A gut feeling that things are not right is the subconscious mind's way of quietly knocking on the door of the brain and saying "Check it Out!".