Derealization and depersonalization are classic symptoms of ANXIETY, not schizophrenia. Good old Generalized Anxiety or Panic Disorder can include symptoms of derealization and/or depersonalization. While some with schizophrenia may experience derealization/depersonalization it is definitely not a feature of schizophrenia.
It's also not a diagnostic criteria for VSS, though can be associated with it.
No, it is not. Pick up a DSM. Depersonalization/Derealization are considered dissociative symptoms and are part of PTSD, Generalized Anxiety Disorder, and Panic Disorder at far higher rates than any psychotic disorder.
Some with psychotic disorders may also experience derealization or depersonalization, just as they may experience depression or anxiety. But derealization and depersonalization are not a symptom of psychosis nor are they associated with any defining features of psychosis or psychotic disorders. They are dissociative disorders.
Inaccurate. Depersonalization is detachment from YOURSELF, not "an inability to understand that other humans are persons."
From the link you posted:
- Feelings that you're seeing your thoughts, feelings, or body or parts of your body from the outside. For example, you may feel like you're floating in the air above yourself.
- Feeling like a robot or that you're not in control of what you say or how you move.
- The sense that your body, legs or arms appear twisted or like they're not the right shape. Or they may seem larger or smaller than usual. You also could feel that your head is wrapped in cotton.
- Emotional or physical numbness of your senses or responses to the world around you.
- A sense that your memories lack emotion, and they may or may not be your own memories.