Depersonalization describes the experience of losing a sense of your own reality, whereas derealization describes losing your sense of reality of the external world.
Derealization is a change in how people see the outside world, making them feel as though it is unreal, remote, distorted, or false. Other signs include the impression that one's surroundings lack depth, spontaneity, and emotion. It is a dissociative symptom that could manifest while under a lot of stress.
Depersonalization is a similar symptom marked by dissociation from one's own body and mental functions, whereas derealization is a subjective sensation relating to a person's perspective of the outside world.
Although they frequently occur together, the two are sometimes known to happen separately. Occipital-temporal dysfunction may be the cause of chronic derealization, which is a rather uncommon condition.
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