Background: In the present paper, we investigated the association between time spent reading and reading comprehension throughout the lifespan. According to the Matthew effect (or rich-get-richer and poor-get-poorer) model, interindividual differences in reading-related skills between poor and average readers become wider as individuals grow…

In this study, we investigate the development of primary memory capacity among children. Children between the ages of 5 and 8 completed 3 novel tasks (split span, interleaved lists, and a modified free-recall task) that measured primary memory by estimating the number of items in the focus of attention that could be spontaneously recalled in…

We examined developmental and individual differences in 6th and 8th graders' fraction arithmetic and overall mathematics achievement and related them to differences in understanding of fraction magnitudes, whole number division, executive functioning, and metacognitive judgments within a cross-sectional design. Results indicated that the…

This nonexperimental study explored the relationships among individual differences, contextual variables, and reading achievement of English language learners (ELLs) in one large urban school district in the United States. The sample comprised 840 students in Grades 3-8 and 10 nested within 37 schools. Hierarchical linear modeling results indicate…

In recent years, schools have tended to eliminate recess period and to devote more time to instruction in order to increase academic achievement. Using a nationally representative sample, this study examined reading scores of students who experienced different numbers of recess days in a week, and different number of times and length of recess in…

Four experiments examined the spelling capability of students in grades 1, 2, 3, 4, 7, and college. Results suggested that reading unit size increases with age and reading ability. Younger children, like adults, unitize common words, and unitization of less common words increases as word configurations become more familiar. (RWB)