Post-event processing (PEP), the act of engaging in a detailed, self-focused, and negative analysis of a prior social situation, has been hypothesised to contribute to the maintenance of social phobia (Clark & Wells, 1995). In light of this proposal, the present study investigated whether deliberate engagement in PEP as opposed to distraction following a speech task elicits unhelpful effects on emotion, cognition, and behaviour in a subsequent speech task in high and low socially anxious participants. The PEP manipulation instructed participants to focus on the anxious thoughts, images, feelings, and somatic sensations relating to the first speech. Contrary to hypotheses, results demonstrated that engaging in PEP as opposed to distraction led to a number of constructive outcomes such as: increased willingness among low socially anxious participants to give the second speech, a reduction in negative performance appraisals and underestimation of performance among high socially anxious participants, and better self-perceived speech quality irrespective of social anxiety level. However, there were no effects of response condition on anxiety, performance appraisals, observable behaviour, and negative cognitions. The findings underscore the need for additional research identifying the precise contents, construals, and processing modes that distinguish between adaptive and maladaptive forms of PEP.