Which of the following symptoms,though common in schizophrenia,is NOT required for a formal diagnosis of the disorder?

Question

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While diminished emotional expression is a common symptom of schizophrenia, it is not required for a formal diagnosis of the disorder. The three symptoms that are required for a diagnosis of schizophrenia are disorganized thinking, hallucinations, and delusions. However, diminished emotional expression can be included as an additional symptom when making a diagnosis.

Which of the Following Symptoms,though Common in Schizophrenia,is NOT Required