Grade 1 literacy skills of twin children in Australia (New South Wales) and the United States (Colorado) were explored in a genetically sensitive design (N = 319 pairs). Analyses indicated strong genetic influence on word and nonword identification, reading comprehension, and spelling. Rapid naming showed more modest, though reliable, genetic…

Two concept-formation experiments were conducted with groups of American and Liberian Ss differing in age and educational background. (Authors)

Interrelationships among metamemory, intelligence, attributional beliefs, self-concept, and strategy use were investigated in 102 German and 91 American children. Some were trained to use a cluster-rehearsal strategy on a Sort Recall task. Post-training assessments tested maintenance, near-transfer, and task-related metamemorial knowledge.…

This study investigated developmental changes in memory performance for two contrasting populations in Urban and Rural Yucatan, Mexico. Subjects were divided into five groups defined by age, including children and adults. All urban S's were in school, while only the two younger rural groups were in school, and older rural S's had little or no…

To study the development of selective attention in children a paradigm was developed in which certain features of the stimulus were designated as relevant for task performance while others were defined as incidental. Performance on the central task was assessed as well as later recall of information about the incidental stimuli, and these two…