In assessing affect, which term describes rapidly changing emotions?

• A. Labile
• B. Flat
• C. Broad
• D. Blunted

Answer: (A)

Labile affect describes rapidly changing emotions. Affect is the outward display of emotion, while mood is the person's internal, longer-lasting emotional state. When affect is labile, the person’s facial expressions, voice, and gestures shift quickly and unpredictably—going from tearful to laughing, or from calm to irritated, in a short span and often with little connection to what’s happening around them. This pattern differs from flat or blunted affect, where there is little or no emotional expression or a muted range of emotion, and from broad affect, which refers to a wide range of emotional expressions but not necessarily rapid shifts. Labile affect can appear in various conditions, such as mood disorders (like bipolar illness during mood swings), delirium, substance effects, or after brain injury, so the key is the speed and volatility of the emotional display.