The temporal relationship between mood disturbance and psychosis is most relevant to distinguishing which pair?

• A. Schizophrenia vs MDD or bipolar
• B. Delusional disorder vs schizophrenia
• C. Schizophrenia vs Schizophrenia
• D. Somatic symptom disorder vs psychosis

Answer: (A)

The timing of mood symptoms relative to psychotic symptoms helps separate a mood-related psychosis from a primary psychotic disorder. When psychosis occurs only during mood episodes (depression or mania/hypomania), it points to a mood disorder with psychotic features (such as major depressive disorder with psychotic features or bipolar disorder with psychotic features). In contrast, schizophrenia is driven by primary psychotic symptoms, and mood symptoms, if present, are not confined to mood episodes and are not the predominant pattern. Thus, the way mood disturbance and psychosis align in time best distinguishes schizophrenia from mood disorders with psychotic features.