## Most Common Negative Symptom in Schizophrenia **Key Point:** Affective flattening (restricted range and intensity of emotional expression) is the most frequently observed negative symptom in schizophrenia, present in the majority of patients. ### Prevalence and Characteristics of Negative Symptoms | Negative Symptom | Frequency | Definition | Clinical Presentation | |---|---|---|---| | **Affective flattening** | 60–80% | Restricted emotional expression | Blunted facial expressions, monotone voice, minimal gesturing | | **Avolition** | 40–60% | Lack of motivation and drive | Apathy, poor hygiene, inability to initiate activities | | **Alogia** | 30–50% | Poverty of speech | Brief, laconic responses; reduced spontaneous speech | | **Anhedonia** | 30–50% | Loss of pleasure capacity | Diminished interest in activities, social withdrawal | ### Affective Flattening: Core Features **High-Yield:** Affective flattening is characterized by: 1. **Reduced facial expressivity** — unchanging facial appearance despite emotional stimuli 2. **Monotone or restricted prosody** — flat, emotionless voice quality 3. **Decreased gesturing** — minimal hand and body movements during speech 4. **Reduced eye contact** — avoidance or minimal engagement **Clinical Pearl:** Affective flattening is one of the earliest and most persistent negative symptoms, often present before the onset of positive symptoms and continuing after their remission. It is a core feature of the deficit syndrome in schizophrenia. **Warning:** Do not confuse affective flattening with depression or medication-induced parkinsonism (which can mimic restricted affect). Affective flattening in schizophrenia is primary and reflects the underlying pathophysiology, whereas secondary causes should be ruled out. **Mnemonic: AAAA** — Affective flattening, Alogia, Avolition, Anhedonia (the "four A's" of negative symptoms). Affective flattening is the most common.
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