An abnormal state in which a person has a persistent, false belief that is maintained, despite indisputable evidence to the contrary. This belief may be with regards to one's own self, other people or any object.

An inability to distinguish between what is real and what only seems to be real.

E.g. A person may falsely believe that a rope lying in front of him is a snake, despite everybody trying to convince him that it is only a rope.

An abnormal state in which a person has a persistent, false belief that is maintained, despite indisputable evidence to the contrary. This belief may be with regards to one's own self, other people or any object.

An inability to distinguish between what is real and what only seems to be real.

E.g. A person may falsely believe that a rope lying in front of him is a snake, despite everybody trying to convince him that it is only a rope.