A patient with Cotard's Syndrome (also called "Cotard delusion" and "Walking Corpse Syndrome") has the delusion that he or she is dead (and sometimes immortal), either figuratively or literally, yet continues interacting with their environment and communicating with others. This seems like a contradiction in it's fundamental diagnosis. Even in this delusional state, how do they rationalize such interactions? To converse with people, they would need to believe such people are alive or at least in a state similar to themselves. Prior knowledge of environmental interactions and social behavior should cause some patients to reflect over their perceived delusional reality at the vary least.
How do patients with Cotard's Syndrome rationalize interactions in active environments and in social settings?