We examined whether inductive reasoning development is better characterized by accounts assuming an early category bias versus an early perceptual bias. We trained 264 children aged 3 to 9 years to categorize novel insects using a rule that directly pitted category membership against appearance. This was followed by an induction task with…

Five experiments were performed in the area of children's causal reasoning to validate a previously reported developmental difference, to examine the role of a possible mediating mechanism, and to test a number of competing theoretical interpretations. (GO)

Assesses five- and 10-year-old children's understanding of second-order belief structures in acted stories in which two characters were independently informed about an object's unexpected transfer to a new location. Results show unexpected early competence around age six or seven under optimal conditions when inference of second-order beliefs is…

Two experiments with children five and eight years of age examined the effects of different types of similarity on analogical problem solving and explored the cognitive components responsible for these effects. Results indicated that superficial and structural similarity facilitated the process of drawing analogies. (WJC)

This paper describes six experiments performed to investigate elementary school childrens' understanding of a proportionality concept, the concept of fullness. (CM)

Used single-subject analyses to examine the developmental difficulty of the ulterior motive question (the backward inverse inference) in five- and seven-year-olds. Results suggest that children's difficulties with ulterior motive information result both from the abstract nature and the logical form of the task. (Author/SKC)

The relationship between memory and reasoning was investigated in three experiments involving children in grades one, four, and seven, and college students. Results indicated that performance was dependent on subjects' abilities to integrate relevant subskills, rather than on deficient reasoning or missing subskills. (RJC)

Examined effects of motivation and intellectual ability on adolescent reasoning. Fifty adolescents were presented "scientific" evidence relevant to their religious affiliations. A manipulation designed to motivate adolescents toward greater accuracy improved overall performance. Crystallized intellectual ability was linked to absolute level of…

A modification of Posner's letter-matching paradigm is employed to study the development of abstract visual and name codes for letters in second, fourth, and sixth grade students. (CM)

A total of eighty 9-month-old infants were presented with a problem consisting of several different conditions which separated response, position on a table, and absolute spatial position as factors leading to errors in search for hidden objects. (MS)

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…

Three- and four-year olds were asked to recall their own or another person's actions and to acknowledge the false belief upon which the action was based. They showed excellent recall of inappropriate actions based on a false belief, but failed to use the recalled action as a clue to acknowledge the false belief upon which it was based. (TJQ)

In a study, few subjects accepted empirical evidence of nonconservation of discontinuous quantity and weight. These findings were interpreted as support for the organismic-developmental claim that lower forms of reasoning are transformed into structurally more advanced forms. (Author/ED)

Examines the hypothesis that poor readers will have much greater difficulty in recalling abstract words than will normal readers but will closely approximate normal readers in recalling concrete words. The hypothesis was confirmed at the second-grade level but not at the sixth-grade level. (Author/CB)

Studied 100 adolescents' approaches to problem-solving proofs and reasoning competence tasks. Found that a formal level of reasoning competence is associated with a deductive approach. Results support the notion of a cognitive development progression from an inductive approach to a deductive approach. (ETB)