What is a key sign of depersonalization in individuals?

Feeling detached from one’s body is a key sign of depersonalization. This phenomenon is characterized by a sense of disconnection or estrangement from one’s self and surroundings, leading individuals to feel as though they are observing themselves from outside their body or feeling like a stranger in their own life. This experience can result in a distorted perception of reality, affecting one's thoughts, emotions, and sense of identity.

The other options represent symptoms of different psychological conditions. Extreme mood swings are more commonly associated with mood disorders, including bipolar disorder. Vivid hallucinations are often linked to psychotic disorders, such as schizophrenia. The inability to recognize faces, known as prosopagnosia, relates more to specific neurological conditions or brain injuries rather than depersonalization.