Silverman W
Am J Ment Defic. 1975 Sep;80(2):197-201.
When stimuli differed on two dimensions (size and shape), either of which furnished enough information for a correct response, retarded subjects were faster to discriminate than when stimuli differed on only one dimension. This result was also found with nonretarded subjects, and the data were taken to support the argument that both populations process information in this type of speeded visual discrimination in similar ways; whatever feature-testing model accommodates the data from nonretarded subjects also describes the data from retarded subjects.
当刺激在两个维度（大小和形状）上不同，且其中任何一个维度都能提供足够信息以做出正确反应时，与刺激仅在一个维度上不同相比，智力发育迟缓的受试者进行辨别更快。非智力发育迟缓的受试者也得到了这一结果，这些数据被用来支持这样一种观点，即这两类人群在这种快速视觉辨别中以相似的方式处理信息；任何适用于非智力发育迟缓受试者数据的特征测试模型也能描述智力发育迟缓受试者的数据。
