Affective instability is rapid, intense, and difficult-to-regulate shifts in emotional state. These fluctuations typically arise from heightened emotional reactivity combined with reduced regulatory capacity. It is a hallmark of borderline-spectrum pathology but appears across various mood and personality conditions. ## Core Functions - Modulation of emotional intensity - Rapid response to emotional cues - Recovery from affective arousal ## Key Components - High limbic reactivity - Slow return to baseline - Sensitivity to interpersonal triggers ## Systems Interactions - Hyperactivation of amygdala and salience networks - Reduced top-down regulation from prefrontal regions ## Clinical Relevance - Predicts impulsive behavior and interpersonal conflict - Contributes to self-soothing via maladaptive coping (substance use, avoidance) ## Related Topics - [[Emotion Regulation]] - [[Borderline Personality Disorder]] - [[Affective Neuroscience]]