A state where one feels that their surrounding environment  (individuals or objects) is unreal.

New York University

Calvin College

A diagnostic proposal that covers c-PTSD symptoms but also includes dissociative symptoms such as depersonalization and derealization that fall outside the ICD-11 emphasis.

Disorders of Extreme Stress Not Otherwise Specified (DESNOS)

1. Derealization
2. Depersonalization
3. Amnesia/dissociative amnesia
4. Identity alternation 

Types of Pathological Dissociative Symptoms

American Psychiatric Association. (2013). Diagnostic and statistical manual of mental disorders (5th ed.). https://doi.org/10.1176/appi.books.9780890425596

DSM-5

Derealization

Depersonalization is a dissociative experience defined by a sense of detachment or unfamiliarity with one's own self. An individual might feel like an outside observer of their own thoughts, feelings, or body.

Depersonalization

Amnesia refers to the partial or total forgetting of an experience or event. Dissociative amnesia is a specific form where an individual is unable to recall important personal information. This memory impairment is not due to ordinary forgetfulness but typically follows an extremely stressful or traumatic event, such as combat, natural disasters, or being a victim of violence.

Dissociative Amnesia

Identity alternation refers to the phenomenon of situational drastic change of an individual 's identity.

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