Based on research linking depressive symptoms and intimate partner aggression perpetration with negatively biased perception of social stimuli, the present authors examined biased perception of emotional expressions as a mechanism in the frequently observed relationship between depression and psychological aggression perpetration.In all, 30 university students made valence ratings (negative to positive) of emotional facial expressions and completed measures of depressive symptoms and psychological aggression perpetration.As expected, depressive symptoms were positively associated with psychological aggression perpetration in an individual's current relationship, and this relationship was mediated by ratings of negative emotional expressions.These findings suggest that negatively biased perception of emotional expressions within the context of elevated depressive symptoms may represent an early stage of information processing that leads to aggressive relationship behaviors.