The present study aimed to examine children's and adults' performance and strategies in volume estimations. Three tasks were designed and presented to 40 adults and 40 6th grade children who were asked to estimate: (a) the number of unit measures (bricks/rice spoons) that may be put in a container, (b) the quantity of bricks/rice, between two…

This study investigates students' and adults' performance in judging reasonableness of computational results, namely reflecting on whether these results qualify as acceptable answers to mathematical tasks. Data was gathered via task-based questionnaires from 160 participants, evenly divided between fifth-graders and adults. Their responses to a…

The aim of the present study was to examine the hypothesis that, compared to typically reading children matched on regular word reading, adults with basic literacy (either adult literacy students or adult basic education students) struggle on phonologically demanding tasks but are relatively performant on orthographic demanding tasks, and hence…

Discrimination of reversible mirrored letters (e.g., d and b) poses a challenge when learning to read as it requires overcoming "mirror invariance," an evolutionary-old perceptual tendency of processing mirror images as equivalent. The present study investigated "when," in reading development, mirror-image discrimination…

Guided by the ecological model of civic development, this study examined the extent to which the growth in children's self-control during middle childhood predicted their civic engagement at age 26 directly and indirectly via their prosociality at age 15. We used data from 1,042 children (50% female, 77% White) in the NICHD Study of Early Child…

At the level of the 50 U.S. states, an interconnected nexus of well-being variables exists. These variables strongly correlate with estimates of state IQ in interesting ways. However, the state IQ estimates are now more than 16 years old, and the state well-being estimates are over 12 years old. Updated state IQ and well-being estimates are…

The purpose of this investigation was to examine the relational reasoning performance of three groups from South Korea who either differed significantly in age or in the timing of their education. One group consisted of 200 sixth-grade adolescents. The other groups were composed of older adults who either attended school during the mandated…

The most recent studies on the acquisition of evidentiality, be it morphologically or syntactically encoded, have argued that the comprehension lag detected is due to factors having to do with others' authority or mental perspective, where "others" stands for other individuals involved in the experiment in various manners (e.g., the…

Cross-sectional studies have shown that greater friendship satisfaction in adulthood is associated with many positive outcomes (Chopik, 2017; Gillespie, Frederick, et al., 2015). However, the developmental antecedents of satisfaction with close friends in adulthood have not been examined using prospective data. We do not know, for example, whether…

Are oral sentences accompanied by pictures easier to understand than written sentences accompanied by the same pictures? This question--intensely discussed for more than two decades in educational, psychological, and psycholinguistic research in terms of "modality effect in multimedia learning," "split-attention effect," or…

This study explored the predictive roles of social expectations (i.e., community influence and social values) and perceived adults' growth mindsets (i.e., teachers' growth mindset and parents' growth mindset) on self-regulated learning (SRL) strategy use and English learning achievement with 685 fourth to fifth graders in Hong Kong. Structural…

Grapheme and syllable units have been shown to influence the dynamics of handwriting in adults and children, but the influence of morphemes remains to be clarified. We tested the ability of French-speaking adults and fourth and sixth grade children to process the morphological structure of words during writing. They were asked to copy three types…

Standardised International Large-Scale Assessments (ILSAs) have gained prominence in global and national educational discussions. ILSAs claim to offer valuable insights for improving education systems, but their impact on educational policy varies and has become a contested arena. This article analyses how these assessments fed educational…

Analogy is a powerful learning mechanism for children to learn novel, abstract concepts from only limited input, yet also requires cognitive supports. My dissertation sought to propose and examine number lines as a mathematical schema of the number system to facilitate both the development of rational number understanding and analogical reasoning.…

People's attitudes toward mathematics are multifaceted. Across four studies, we found that children and adults have different attitudes about mathematics when asked specifically about whole numbers, as opposed to fractions. The vast majority of children and adults reported negative attitudes toward fractions despite having positive attitudes…