Two studies examined the reduction of triggered displaced aggression (TDA) via bottom-up processing modes of de-categorization. Participants were provoked by the experimenter and then interacted with an ostensible out-group member who either did or did not provide a second (triggering) provocation. Study 1 compared TDA toward a triggering out-group member who had previously been either differentiated from the out-group, made the focus of self-other comparison, or was in a no-information control condition. As predicted, both differentiation and self-other comparison reduced aggression relative to the control condition. Study 2 examined the effect of negative self-disclosure from the outgroup target, and contrasted its effects with both self-other comparison with a negative other, and a noinformation control condition. As predicted, triggered participants in the negative self-disclosure condition aggressed less than those triggered in the negative self-other comparison or no-information control conditions. The liking induced by self-disclosure mediated its aggression-reducing effect. Copyright # 2006 John Wiley & Sons, Ltd.Imagine a man who, after being angered by a severe reprimand from his boss, refrains from retaliation for fear of losing his job. A few minutes later, one of his co-workers-an out-group member-borrows a pen from his desk without permission. In response, he publicly berates the borrower for being presumptive and inappropriate, surprising those who witness his outburst in response to such a minor infraction. This scenario illustrates triggered displaced aggression (TDA). The TDA paradigm, as implemented by Pedersen, Gonzales, and Miller (2000), conceptually describes circumstances in which a minor provocation, the trigger, can elicit a retaliatory response of greater magnitude than is warranted by the tit-for-tat matching rule that generally governs social interaction (Axelrod, 1984). It identifies the experience of a previous, more intense provocation as a critical antecedent for this effect.