Educators and psychologists have long feared that children entering school with behavior problems were doomed to fall behind in the upper grades. But two new studies suggest that those fears are exaggerated.
One concluded that kindergartners who are identified as troubled do as well academically as their peers in elementary school. The other found that children with attention deficit disorders suffer primarily from a delay in brain development, not from a deficit or flaw.
Experts say the findings of the two studies, being published Tuesday in separate journals, could change the way scientists, teachers and parents understand and manage children who are disruptive or emotionally withdrawn in the early years of school. The studies might even prompt a reassessment of the possible causes of disruptive behavior in some children.
“I think these may become landmark findings, forcing us to ask whether these acting-out kinds of problems are secondary to the inappropriate maturity expectations that some educators place on young children as soon as they enter classrooms,” said Sharon Landesman Ramey, director of the Georgetown University Center on Health and Education, who was not connected with either study.
In one study, an international team of researchers analyzed measures of social and intellectual development from more than 16,000 children and found that disruptive or antisocial behaviors in kindergarten did not correlated with academic success at the end of elementary school.
Kindergartners who interrupted the teacher, defied instructions and even picked fights were performing as well in reading and math as well-behaved children of the same abilities when they both reached fifth grade, the study found....
In the other study, researchers from the National Institute of Mental Health and McGill University, using imaging techniques, found that the brains of children with attention-deficit hyperactivity disorder developed normally but more slowly in some areas than the brains of children without the disorder.
The disorder, also known as A.D.H.D., is by far the most common psychiatric diagnosis given to disruptive young children; 3 percent to 5 percent of school-age children are thought to be affected. Researchers have long debated whether it was a result of a brain deficit or to a delay in development.
Doctors said that the report, being published in The Proceedings of the National Academy of Sciences, helps to explain why so many children grow out of the diagnosis in middle school or later, often after taking stimulant medications to improve concentration in earlier grades.
The findings in the first study grew out of a collaboration among a dozen leading researchers to reassess data from six large child-development studies performed since 1970. Each of these six studies tracked hundreds of children from an early age through elementary school on a number of measures, from reading and math skills to emotional stability and concentration, or attention. Most of the studies used teachers’ reports to gauge students’ emotional and social progress and their ability to pay attention when asked.
The researchers adjusted the findings to eliminate the influence of factors like family income and family structure.
While there was little correlation between behavior problems in kindergarten and later academic success, the researchers did find that scores on math tests at ages 5 or 6 were highly correlated with academic success in fifth grade. Kindergarten reading skills and scores on attention measures — where youngsters with A.D.H.D. falter — also predicted later academic success, but less strongly than math scores did. The pattern was about the same in girls as in and boys, and for children from affluent families as well as those from lower-income groups.
The authors of the study suggested that preschool programs might consider developing more effective math training. The findings should also put to rest concerns that boys and girls who are restless, disruptive or withdrawn in kindergarten are bound to suffer academically.
“For kindergarten, it appears teachers are able to work around these behavior problems in a way that enables kids to learn just much as other kids with equal levels of ability,” said the lead author, Greg J. Duncan, a professor of human development and social policy at Northwestern University....
In the second study, government psychiatric researchers compared brain scans from two groups of children: one with attention deficit disorder, the other without. The scientists had tracked the children — 223 in each group — from ages 6 to 16, taking multiple scans on each child.
In a normally developing brain, the cerebral cortex — the outer wrapping, where circuits involved in conscious thought are concentrated — thickens during early childhood. It then reverses course and thins out, losing neurons as the brain matures through adolescence. The study found that, on average, the brains of children with A.D.H.D. began this “pruning” process at age 10 ½, about three years later than their peers....
But the greatest delays in brain maturation were found in precisely those areas of the cortex most involved in attention and motor control, said the lead author of the study, Dr. Philip Shaw, a psychiatrist at the National Institute of Mental Health. “Those are exactly the areas where we would expect to find differences,” he said....
“The basic sequence of development in the brains of these kids with A.D.H.D. was intact, absolutely normal,” Dr. Shaw said. “I think this is pretty strong evidence we’re talking about a delay, and not an abnormal brain.”
About three in four children do grow out of the problem by early adulthood, he said.