When reasoning about time, English-speaking adults often invoke a "mental timeline" stretching from left to right. Although the direction of the timeline varies across cultures, the tendency to represent time as a line has been argued to be ubiquitous and primitive. On this hypothesis, we might predict that children also spontaneously invoke a spatial timeline when reasoning about time. However, little is known about how and when the mental timeline develops, or to what extent it is variable and malleable in childhood. Here, we used a sticker placement task to test whether preschoolers and kindergarteners spontaneously map temporal events (breakfast, lunch, and dinner) and deictic time words (yesterday, today, tomorrow) onto lines, and to what degree their representations of time are adult-like. We found that, at age 4, preschoolers were able to arrange temporal items in lines with minimal spatial priming. However, unlike kindergarteners and adults, most preschoolers did not represent time as a line spontaneously, in the absence of priming, and did not prefer left-to-right over right-to-left lines. Furthermore, unlike most adults, children of all ages could be easily primed to adopt an unconventional vertical timeline. Our findings suggest that mappings between time and space in children are initially flexible, and become increasingly automatic and conventionalized in the early school years.
Children's work habits at school include being a hard worker, turning in work on time, following classroom rules, and putting forward one's best effort. Models on youth character, noncognitive skills, and social-emotional learning suggest that self-management skills like work habits are critical for individuals' subsequent academic success. Using data from 1,124 children in the NICHD Study of Early Childcare and Youth Development (49% female; 77% White), we examined children's developing work habits from first to sixth grade and their developmental cascading effects on academic outcomes at the beginning and end of high school as well as at age 26. The findings on differential stability of work habits (i.e., bivariate correlations) suggest that children were likely to maintain their relative position among peers from first to sixth grade. The complementary findings on mean-level changes from the latent growth curves suggest that children's work habits exhibited mean-level increases over the same period, meaning that children's work habits became more advanced from first to sixth grade. Models used to examine the developmental cascades of work habits suggest that children's work habits at first grade and the growth in children's work habits from first to sixth grade (a) directly predicted their academic outcomes at the beginning and the end of high school, and (b) indirectly predicted their educational attainment at age 26 through their academic outcomes during adolescence. These findings underscore the importance of foundational noncognitive skills during middle childhood that predict individuals' academic outcomes up to 20 years later in adulthood.
The COVID-19 pandemic has financial and emotional impacts on families. We explored how caregivers’ financial strain and mental health are associated with changes in their young children’s behavior during the pandemic. We additionally considered whether having a sense of purpose moderated these associations. Caregivers ( n = 300) in the emergency department of a children’s hospital were surveyed anonymously about changes to their employment (e.g., reduced/increased hours and job loss), ability to pay for expenses and whether their child’s behavior had changed. Aligned with the Family Stress Model, caregivers’ financial strain was associated with poor mental health, inconsistent sleep routines, and changes in children’s problematic and prosocial behaviors. A sense of purpose buffered some of these relationships. Families are differently affected by the pandemic and our findings underscore the need for supporting caregivers’ mental health and connecting them with resources.
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