The relations among children's physiological arousal at encoding and retrieval, interviewer-provided social support and children's memory for a mild stressor were examined in 109 five-and six-yearolds. The children came to a research laboratory and watched a fear eliciting video clip. A week later, their memory for the video clip was tested by either a supportive or nonsupportive interviewer. While watching the video and completing the memory interview, children's heart rate was monitored. Increased heart rate at encoding was associated with fewer incorrect responses. In contrast, increased heart rate at retrieval was associated with poorer memory, but only when the interviewer was nonsupportive. Heart rate was unrelated to memory when the interviewer was supportive. Results suggest that arousal at encoding and retrieval have different implications for children's memory for a mild stressor, particularly in nonsupportive interview contexts.For some time, there has been considerable interest in understanding how emotions, particularly negative emotions, affect mnemonic processes in children. This interest stems from theoretical questions concerning the effects of emotions on cognitive processes and applied questions concerning coping with stress, the development of trauma disorders, and the accuracy of children's eyewitness testimony. Although numerous researchers have examined the relations between negative emotions and memory in children, researchers have not concurrently taken into account children's arousal at both encoding and retrieval as separate predictors of memory. Nor have researchers considered how interviewer demeanour, specifically interviewer supportiveness, affects children's memory for stressful events, directly and also in conjunction with children's arousal. In the present study, we examined the relations between children's physiological arousal, both at encoding and retrieval, and their memory for fearful information. Of importance, we manipulated the interviewer's demeanour to investigate the extent to which variations in social support, in conjunction with children's arousal at retrieval, affect their memory.Prior studies of emotion and memory in children have typically focused on how differences in children's 'arousal' or 'distress' relate to their memory. Results have revealed somewhat inconsistent findings. Although many researchers have reported APPLIED COGNITIVE PSYCHOLOGY