This short youtube clip is from a talk by neurologist Vilayanur Ramachandran on the topic of anosognosia. From Wikipedia on the condition:
Anosognosia is a condition in which a person who suffers disability due to brain injury seems unaware of or denies the existence of their handicap. This may include unawareness of quite dramatic impairments, such as blindness or paralysis.
So as Ramachandran describes in the clip, a patient with anosognosia appears to be consciously unaware of their handicap, even though through testing, you can show that some part of their brain is aware of the extent of their handicap. Patients maintain a delusion in their consciousness that denies the handicap - caused by damage to the brain. What is interesting is, that I wonder if theists realise that this is how they look to atheists - maintaining a deluded belief in god, in the face of absolutely no good evidence to support it?
