Five categories of cognitive judgments were discussed, relative to Piagetian levels of development, as follows: time, weight conservation, Type I illusions (Poggendorf), moral judgment, and color discrimination. Normative research and the mentally retarded in five areas of these judgments was reviewed, with additional suggestions for research being offered.
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The corresponding record at NLM can be accessed at https://www.ncbi.nlm.nih.gov/pubmed/7288419