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Children from wealthier families tend to start school with a better ability to hold and use information in their minds, but engaging kids in activities like reading or puzzles is associated with bridging this gap. A large study tracking students from kindergarten through fifth grade found that mentally engaging parenting practices are linked to protected cognitive development in children from disadvantaged backgrounds. The research was published in Learning and Individual Differences.
Working memory is the mental capacity to temporarily hold and manipulate information. It acts as a mental workspace for tasks like reasoning, planning, and understanding language. In a classroom, a child uses working memory to remember multi-step instructions or to solve mental math problems. This cognitive skill is strongly linked to how well children learn when they enter formal schooling.
During early childhood, this mental capacity grows rapidly. A family’s socioeconomic status, which encompasses household income, parental education, and job prestige, is closely tied to this early cognitive development. Children raised in families with fewer resources often face chronic stress and have less access to educational materials. These factors are frequently associated with slower cognitive growth compared to peers from wealthier backgrounds.
Past research has shown mixed results about whether these early cognitive gaps widen, remain the same, or shrink as children progress through school. Researchers Li Zhao, Stephanie W.Y. Chan, and Shuyang Dong wanted to map exactly how working memory changes across childhood. They also examined whether specific parenting behaviors could alter the statistical relationship between a family’s socioeconomic background and a child’s cognitive growth.
The team analyzed data from a large study of 15,437 children in the United States. The information came from a national education database that followed a representative group of students from their kindergarten year in 2010 through the fifth grade. To measure working memory, the original survey administrators used a backward digit span task. Children listened to a sequence of numbers and had to repeat them back in reverse order.
The number sequences grew longer as the children succeeded, testing the limits of their mental capacity. This test was given to the students multiple times between kindergarten and the fifth grade. During the kindergarten year, parents answered survey questions about their household income, education levels, and occupations.
Parents also reported on three dimensions of their parenting behavior. They answered questions about cognitive stimulation, which included how often they read, sang, or did arts and crafts with their children. The survey also asked about parental warmth, such as how often parents expressed affection or felt close to their child. Finally, parents reported on negative discipline, specifically whether they spanked their child and how many times they had done so in the past week.
Using all these data points, the researchers built statistical models to track cognitive growth over time. Overall, working memory increased steadily for most children as they progressed through elementary school. The growth happened fastest in the early years and began to level off as the children approached the fifth grade.
A family’s socioeconomic status was linked to exactly how this growth happened. Children from higher socioeconomic backgrounds started kindergarten with better working memory scores than their less wealthy peers. However, children from lower socioeconomic backgrounds actually showed a faster initial rate of cognitive growth during the early school years.
This early burst of growth allowed disadvantaged children to narrow the cognitive gap slightly. The researchers suspect that entering a structured school environment provides an initial boost to children who lacked resources at home. Yet, their working memory growth started to plateau much earlier than that of their wealthier peers. Children from higher socioeconomic backgrounds experienced a steadier, more prolonged period of working memory development.
Because of this longer growth period, the cognitive gap remained evident by the end of fifth grade. Over time, cumulative disadvantages like limited access to enriching extracurricular activities can continue to restrict cognitive development. Wealthier children keep benefiting from sustained access to enriched resources, allowing their mental capacities to grow for a longer period.
The researchers then looked at how parenting behaviors altered these trends. They found that cognitive stimulation was associated with a buffering effect against the negative impacts of a lower socioeconomic background. Children whose parents frequently engaged them in reading, puzzles, and nature activities tended to start kindergarten with higher working memory scores.
These engaging activities were also linked to changes in the trajectory of the children’s cognitive growth. Children receiving high levels of cognitive stimulation experienced a delayed plateau in their working memory development. This means their cognitive skills continued growing for a longer time, following a pattern more similar to the growth of children from wealthier families.
Other parenting behaviors did not alter the relationship between family wealth and cognitive growth. The results were not statistically significant for parental warmth modifying the socioeconomic disparities in working memory. The researchers noted that most parents in the survey reported very high levels of warmth, which might have made it difficult to detect any subtle statistical variations.
Spanking also failed to change the trajectory of socioeconomic disparities. While spanking was generally linked to poorer working memory across all groups, it did not uniquely associate with a change in the cognitive gap tied to socioeconomic status. Physical discipline appeared to be negatively linked to cognitive development regardless of a family’s income or education level.
There are a few limitations to the study design. All data on parenting behaviors were reported by the parents themselves. People often answer surveys in ways that make them look better, which can introduce bias into the results. Future projects could use direct observations of parent-child interactions to get more objective measurements.
Additionally, the researchers only used data on family income and parenting behaviors from the children’s kindergarten year. Families experience financial changes, and parenting styles evolve as children grow. By only looking at a single point in time, the study cannot account for how shifting family dynamics over the next five years might have shaped the students’ development.
The measurement of physical discipline was also quite narrow. The survey asked parents if they spanked their child and how many times they had done so in the past week. This short timeframe makes it hard to capture chronic patterns of harsh discipline. A longer assessment period would be needed to see how consistent physical discipline associates with cognitive growth over years.
The backward digit span task only assesses one specific type of cognitive processing. Working memory has multiple components, including the ability to remember spatial information. Using a wider variety of cognitive tests would provide a more complete picture of a child’s mental capabilities.
Finally, the data came exclusively from a sample of children in the United States. Educational systems and cultural parenting norms vary widely around the world. The ways that wealth and parenting interact to shape cognitive growth might look different in other countries.
The study, “Development of working memory through childhood: The interplay of family socioeconomic status and parenting behaviors,” was authored by Li Zhao, Stephanie W.Y. Chan, and Shuyang Dong.