Shaywitz等通过小白鼠试验,提出当实验性使10～25日龄的乳鼠多巴胺缺乏时,此时乳鼠表现活动过多,学习困难.但此一结果不能完全适用于儿童,因10～25日龄为鼠之断乳期,而80～100日鼠龄才相当于青春期.作者提出MBD是多种原因所致,而多巴胺缺乏可能是原因之一.并认为去甲肾上腺素(NE)与活动 Shaywitz and other mice through the trial, made when the experimental 10 to 25 days old rats lack of dopamine, this time showed excessive activity of young rats, learning difficulties, but this result can not be fully applied to children, because 10 ~ 25 The age of the mice is the weaning period, while the 80-100 days of the mouse age is equivalent to adolescence. The authors suggest that MBD is caused by a variety of reasons, and the lack of dopamine may be one of the reasons that norepinephrine (NE) and activity