Mental-content verbs such as "think," "believe," "imagine" and "hope" seem to pose special problems for the young language learner. One possible explanation for these difficulties is that the concepts that these verbs express are hard to grasp and therefore their acquisition must await relevant conceptual development. According to a different,…

Children aged 6 through 9 made drawings of cubes and simple abstract designs, with or without looking at their hand. Copying errors and differences between the age groups were discussed in terms of visual realism (perspective drawing) compared with intellectual realism (structural essentials copied without a unified perspective view). (CTM)