They were inspired by questions from animal welfare committees at universities about whether mice were really enjoying wheel-running, an activity used in all sorts of studies, or were instead like bears pacing in a cage, stressed and neurotic. 这些委员会质疑小鼠是否真的喜欢在轮子上跑步&所有研究都会用到这个活动,或者还是像在笼子里踱步的熊那样,出于压力和紧张。