A study investigating developmental differences in the ability to reason with conditional propositions used five variations of Wason's selection task to assess conditional reasoning in 132 eighth, tenth, and twelfth grade adolescents. In addition to examining developmental differences, the study had as an objective to examine the role of semantic…

Three experiments with children between 5 and 7 years are described. It is shown that nominal predication of an unknown word by a superordinate term enables young children to make appropriate inferences concerning its attributes. The results are discussed in relation to semantic development and reasoning in the young child. (Author/RM)

Three experiments investigated children's typical errors in judging the truth of universally quantified conditional sentences containing "P and not-Q." The error survived on sentences referring to particular things. For second- and fifth-graders, the error survived for nonuniversally quantified conditionals, and for second-graders, the…

A study of the development of abstract noun definitions in children and adolescents had as its subjects 120 students evenly divided into age groups of 10-, 14-, and 18-year-olds, randomly selected from students scoring in the 40th to 88th percentiles on the Iowa Test of Basic Skills (for 10-year-olds) and the Tests of Achievement and Proficiency…

Students, ages 12, 15, 18, and 23 (n=60 per group), wrote definitions for 16 abstract nouns. Responses were analyzed for Aristotelian style. There was an increasing tendency for students to mention the appropriate category to which a word belongs, core features of the word, and subtle aspects of meaning. (DB)

The multiordinal use of terms requires the ability to distinguish essential relationships and attributes from incidental ones. Until the child reaches adolescence, his tendency to confuse incidental and affective factors with those crucial to word meaning hinders his use of terms at all levels of abstraction. Korzybski's theory of multiordinality…

Describes and critiques a study conducted with boys eight- to fourteen-years-old to test whether intensionality (defined as supraordination) and maladjustment are related. Concludes that the boys tested may have been too young to have fully developed their supraordination abilities and that boys' ability or preference to make supraordinate…

The hypothesized relationship between an individual's age, educational background, and ability to understand aspects of semantic ambiguity was investigated in this study. The 90 subjects included ten students in each of grades two, four, six, eight, and ten, as well as ten college undergraduates, ten graduate students, ten high school graduates,…

The range of meanings of "big" and "little" that mothers and their three children under age two expressed in relatively natural communication situations was studied. Longitudinal data from transcripts of conversations of middle-class mothers and their children were analyzed along with diary records kept by parents of their children's use of size…