以前的研究已经报道了接触低水平的镉和铅与儿童学习障碍之间有一定关系。例如:已注意到了在接触低水平铅的儿童中出现如活动过度这样的行动障碍、学习能力逐渐减退、集中注意力的时间缩短、胆小以及一般性的退步。还比较了学习能力减退的儿童和正常的儿童,发现学习能力减退的儿童身体中的铅较高。 Previous studies have reported a link between exposure to low levels of cadmium and lead and learning disabilities in children. For example, it has been noted that there are obstacles to mobility such as hyperactivity disorder in children exposed to low levels of lead, diminishing learning abilities, shortened attention periods, timid, and general regression. Also compared with children with learning disabilities and normal children, found that children with learning disabilities decreased higher lead.