Babies whose low-income mothers received significant monthly cash support had more brain activity associated with thinking and learning after one year, a study said yesterday.
The paper published in the journal Proceedings of the National Academy of Sciences describes the first results of an ongoing US study looking at how reducing poverty can affect cognitive behavior.
“We have known for many years that growing up in poverty puts children at risk for lower school achievement, reduced earnings and poorer health,” study senior author Kimberly Noble told reporters.
However, until now it was unknown whether this difference came from the lack of financial resources itself or other factors commonly associated with poverty.
“This is the first study to show that reducing poverty changes child brain development,” Noble said.
In 2018, Noble and her team began recruiting 1,000 low-income mothers and their newborn babies from maternity wards in four major US cities for the “Baby’s First Years” randomized control trial.
They assigned some of the women to receive a nominal monthly stipend of US$20, while others received US$333.
For the mothers in the study, who reported average annual earnings of just over US$20,000 dollars, the larger gift corresponded to a 20 percent boost.
As the children turned one, researchers went to their homes with a special infant EEG monitor — a device that detects electrical signals within the brain — to measure their brain activity.
They monitored 435 of the 1,000 infants before the COVID-19 pandemic prevented them from visiting the families to carry out readings and found a stark difference between which babies showed more high-frequency brain activity associated with learning.
“As the frequency gets higher, you see more for the infants in the high cash gift group,” the study’s lead author Sonya Troller-Renfree told reporters.
Children with less cash support showed less of that brain activity, the study said.
Noble said that the amount allocated to the high cash gift group was intentional.
A 2010 study in the American Economic Journal: Applied Economics showed a US$4,000 difference in annual income early in childhood is associated with higher school achievement.
The amount is also comparable to benefits that some of the mothers studied might qualify for.
“It was an amount that we thought might both move the needle and hold some policy relevance,” Noble said.
As the study was focused on the effect of direct financial support on cognitive behavior, it was important that the cash gifts be given without conditions attached.
However, the next steps of the “Baby’s First Years” research is to look at how the money was spent, based on information volunteered by the mothers.
The project would continue to monitor the families until the babies are four years and four months old.
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