## First-Rank Symptoms (Schneider's Criteria) **Key Point:** First-rank symptoms are highly specific for schizophrenia and, when present in the absence of organic brain disease, are considered diagnostic of schizophrenia. ### Categories of First-Rank Symptoms | Category | Examples | |----------|----------| | **Auditory hallucinations** | Running commentary (two voices discussing the patient); voices repeating thoughts aloud; voices commenting on actions | | **Thought insertion/withdrawal** | Belief that thoughts are not one's own; thoughts are being removed from the mind | | **Thought broadcasting** | Belief that thoughts are being transmitted to others | | **Delusional perception** | Normal perception given delusional meaning | | **Passivity experiences** | Belief that actions, impulses, or feelings are controlled by external forces | **High-Yield:** Auditory hallucinations **commenting on the patient's actions** (e.g., "He is walking now, now he is sitting") is a classic first-rank symptom and highly specific for schizophrenia. **Clinical Pearl:** While first-rank symptoms are highly specific, they are not required for diagnosis—schizophrenia can be diagnosed with second-rank symptoms (e.g., other hallucinations, delusions, thought disorders) if present for sufficient duration. **Mnemonic:** **TAPPED** — Thought insertion/withdrawal, Auditory hallucinations (commentary), Passivity experiences, Perception (delusional), Thought broadcasting, Delusional perception. [cite:ICD-10, DSM-5 Schizophrenia Criteria]
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