Researchers at the University of British Columbia showed subjects one of two different slide shows-either a depiction of people brandishing guns or images of individuals who were obviously ailing.

不列颠哥伦比亚大学的研究员给实验对象观看两组不同人物的幻灯片，一组是正在挥动枪支的人，另一组是症状很明显的病患。