Forty toddlers, 1 1/2 to 3 1/2 years of age, and 8 adults, searched for stickers that were hidden underneath two discretely different classes of objects embedded in arrays containing several classes. Study results suggest that the children appear to have been attempting to determine which kinds of choices were the wrong ones. (Author/RWB)

Assesses performance of 9-, 13-, and 20-year-olds on 3,840 trials of a mental rotation task in which subjects judged if pairs of stimuli presented in different orientations were identical or mirror images. Results are discussed in terms of possible mechanisms underlying the impact of practice. (Author/NH)

Examines kindergartners' and second graders' knowledge of concept attribute importance and the children's use of this knowledge to categorize. (HOD)

Examines the relationship between the mental effort requirement of cumulative rehearsal and spontaneous utilization of the strategy by three groups of children (mean ages 7.6, 8.7, and 11.5 years). Results showed that the mental effort requirement of strategy use may influence children's strategy selection on memory tasks. (Author/CI)

Explored the effects of sorting methods upon the content of children's constructs. Results indicated that dyadic sorting and free response methods of construct elicitation differentially affect the types of constructs produced. (Author/BL)

Proposes that component units of prediction hypotheses are acquired independently and at different rates by the young child. On the basis of a combination of learning-set and blank-trial evaluations of children's conceptions, finds that young children exhibit response patterns corresponding to hypotheses in most of their probes. (Author/CI)

Two experiments studied nine-year-olds, l3-year-olds, and adults in their encoding of two kinds of stimuli taken from a psychometric measure of spatial aptitude. The first experiment used letter-like stimuli; the second employed multi-element flags. (CI)

Herzog and Wallace (A. Herzog and R. Wallace, 1997) discussed a measure designed to assess the cognitive functioning of older adults who participated in the study formerly known as the Asset and Health Dynamics among the Oldest Old (AHEAD). The measure derived from four well-known tests of cognitive functioning, but improves on them by combining…

Although the ability to conserve number held up well with age, quantity conservation performance was generally lower in the subjects over 65 years of age than in the college and adult age groups. (Author)

Study concerned with the mechanisms in terms of which the developmental transformation from one cognitive structure to another occurs. (Author)

After viewing pictures of simple objects varied in color and spatial location, first, third, and fifth graders were assessed for their abilities in automatic processing of spatial and color information. In general, no evidence was found to suggest that the processing strategies of younger children were less sophisticated than those of older…

Compared 12 old and 12 young adults in two information-processing tasks (a rotated figures task and a sentence verification task). The age difference was minimized when older adults adopted strategies that reduced processing. They were more disadvantaged when employing strategies that imposed greater processing demands or memory load. (JAC)

The performance of children ages three through eight years on a series of class-inclusion problems was examined in two studies. Three patterns of performance were observed: three- and four-year-olds responded in an approximately haphazard pattern, five- and six-year-olds tended to be consistently wrong, and seven- and eight-year-olds showed a…