The number line estimation task is frequently used to measure children's numerical magnitude understanding. It is unclear whether the resulting straight, horizontal, left-to-right-oriented estimate patterns indicate task constraints or children's intuitive number--space mapping. Three- to six-year-old children (N = 72, M[subscript age] = 4.89, 56%…

This study examined how adolescents' emotions in mathematics develop over time. Growth curve modeling was applied to longitudinal data collected annually from 2002 to 2006 (Grades 5-9; N = 3425 German adolescents; M[subscript age] = 11.7, 15.6 years at the first and last waves, respectively; 50.0% female). Results indicated that enjoyment and…

This cross-cultural study investigates how maternal task assignment relates to toddlers' requested behavior and helping between 18 and 30 months. One hundred seven mother-child dyads were assessed in three different cultural contexts (rural Brazil, urban Germany, and urban Brazil). Brazilian mothers showed assertive scaffolding (serious and…

Living in complex social worlds, individuals encounter discordant values across life contexts, potentially resulting in different importance of values across contexts. Value differentiation is defined here as the degree to which values receive different importance depending on the context in which they are considered. Early and mid-adolescents (N…

This study analyzed German and Nso mothers' auditory, proximal, and visual contingent responses to their infants' nondistress vocalizations in postnatal Weeks 4, 6, 8, 10, and 12. Visual contingency scores increased whereas proximal contingency scores decreased over time for the independent (German urban middle-class, N = 20) but not the…

This research examined how motivation (perceived control, intrinsic motivation, and extrinsic motivation), cognitive learning strategies (deep and surface strategies), and intelligence jointly predict long-term growth in students' mathematics achievement over 5 years. Using longitudinal data from six annual waves (Grades 5 through 10;…

Two comprehension experiments were conducted to investigate whether German children are able to use the grammatical cues of word order and word endings (case markers) to identify agents and patients in a causative sentence and whether they weigh these two cues differently across development. Two-year-olds correctly understood only sentences with…

First through fourth graders and adults judged the effect of two forces pulling simultaneously at one object by predicting the direction of the resultant force. Found that children took into account either the direction or the amount of both forces and that performance improved with age. (BC)

Samples of spontaneous speech were collected from 20 English and 20 German preschool children and their mothers. The children's frequency of use of various tenses was compared at different age levels within each language, across languages, and with their mothers' frequency of tense usage in speech to the children. (Author/JMB)

A total of 87 children were observed in play with unfamiliar peers at 4, 6, and 8 years of age, and judged by their parents for inhibition. Observed inhibited behavior and parental judgments of inhibition became increasingly associated with solitary-passive activity. With increasing age, inhibited children spent longer periods in solitary-passive…

Assessed children's beliefs about the effectiveness of five causes of school success. At the age of 7-8 years, children differentiated the factors into "unknown" and "other"; at 9-10, "other" was differentiated into "internal" and "external"; at 11-12, "internal" was differentiated into…