Poverty Affects Child Brain Development More Than IQ, Study Finds
A family’s economic condition has a profound influence on a child’s brain development, even more so than intelligence quotient (IQ), parenting patterns, or health history.
These findings were revealed in a recent study conducted by researchers from Washington University, USA. The study shows that socioeconomic factors contribute to approximately 16% of the variation in children’s brain function, making it the most dominant factor compared to various other aspects previously thought to determine child development.
The research confirms that the environment in which a child grows up, including family financial conditions and the surrounding living environment, plays a major role in shaping how their brains function.
“The brains of children from low socioeconomic backgrounds look like the brains of children from high socioeconomic environments who experience sleep deprivation and stress,” said the study’s senior author, Nico Dosenbach, as quoted by Euro News.
However, Dosenbach emphasised that this does not mean children from poor families possess less intelligent brains. He stated that the observed differences are largely influenced by the factors of stress and lack of sleep frequently experienced by children living in limited economic conditions.
He added that if there were ways to improve sleep quality and reduce stress levels in children from low-income families, a significant portion of these differences in brain development could potentially be mitigated.
Poverty remains one of the greatest challenges for children worldwide. They are more vulnerable to living in poverty than adults, and the impact can persist throughout their entire growth period.
UNICEF data shows that nearly 900 million children globally experience multidimensional poverty. This means they lack basic necessities such as food, clean water, housing, education, and healthcare services.
In the study, scientists analysed approximately 12,000 children aged 9 to 10 years. They studied the living environments, health conditions, and daily activities of these children.
A total of 649 variables affecting brain development were studied and categorised, ranging from screen time and cognitive abilities to physical and mental health, parenting, race, and gender.
The results showed that living conditions and family financial status emerged as the most influential factors. These two factors are primarily related to the function of the motor and sensory areas of the brain, which are highly sensitive to changes in sleep quality and daily stress levels.
The study’s lead author, Scott Marek, admitted to being surprised by the magnitude of the economic factor’s influence on child brain development.
“I call it the ‘elephant in the brain’. I did expect socioeconomic opportunities to have an impact, but I did not expect the impact to be this large. It far outweighs other factors,” said Marek.
According to him, simply by looking at the results of a child’s brain scan, the research team could estimate their family’s economic condition and determine whether the child was getting enough sleep and how much screen time they had each day. Conversely, brain scans were unable to indicate a child’s IQ level.
These findings led Marek to argue that IQ may not be entirely rooted in biological brain factors. The environment in which a child grows up is believed to shape brain development in ways that have often been misinterpreted as differences in intelligence.
“The environment shapes a child’s brain in ways that are often perceived as a reflection of IQ, when in reality, it more accurately reflects stress and sleep deprivation,” he said.