Money How Income Affects the Brain

14:15  16 may  2018
14:15  16 may  2018 Source:   theatlantic.com

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We often attribute financial problems to bad life decisions: Why didn’t that person stay in college? Why didn’t they pick a more lucrative career? Why did they have so many kids? But several recent studies suggest that having less money can actually affect thinking and memory for the worse. In the most recent of these papers, scientists found a link between being lower on the socioeconomic ladder and changes in the brain.

For this study, published this week in the Proceedings of the National Academy of Sciences, researchers at the Center for Vital Longevity at the University of Texas at Dallas scanned the brains of 304 people aged 20 to 89. The researchers were looking for two things: First, how much grey matter the subjects had in their brains. Second, how their brain networks were organized. In the brain, areas that have related functions often show similar activity: The areas that control speech, for example, tend to interact more with each other and less with the areas involved with different bodily functions. It’s generally considered to be a good thing for brain networks to be “segregated” in this way.

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It was the analysis that showed a correlation between a parent’s income and education level to development in specific areas of the brain essential to learning, memory and stress And how about what it means for parents? Providing a warm environment with regular stimulation, she said, is ideal.

The Neurocognition, Early Experience, and Development Lab is home to cutting-edge research on how poverty affects young brains The data indicated that small increases in family income had a much larger impact on the brains of the poorest children than similar increases among wealthier children.

The researchers then correlated those brain images with the subjects’ education and employment histories—together, their overall socioeconomic status. It turned out that, among the middle-aged people (those aged 35 to 64), the higher-status participants both had more grey matter and more of this beneficial “segregation” in their brain networks. Both measures are correlated with better memory and are considered protective against dementia and other signs of brain aging.

This relationship held even after the authors controlled for things like mental and physical health, cognitive ability, and even their socioeconomic status in childhood, rather than adulthood. That is, growing up rich or poor didn’t necessarily affect the brain health of the middle-aged people. But it seems something about their lives in adulthood did.

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FNIRS has been used in infants since the late 1990s and is now gaining traction in low- income settings. The researchers are also performing MRIs at a hospital near the clinic. This article was originally published with the title " How Poverty Affects the Brain ".

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What could those things be? People who had lower-paying jobs might have had worse access to health care and healthy food. They might live in more polluted neighborhoods or have lives that are less intellectually stimulating. The stress of being low on the socioeconomic totem pole raises levels of allostatic load—a measure of stress hormones that cause wear and tear on the body, including the brain.

“We’re starting to learn more about the impact of both stress and continuous learning on the brain,” says Gagan Wig, a neuroscientist at UTD and the principal investigator of the study. “It’s consistent with the idea that lifelong experiences might influence brain health.”

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Past studies have also suggested that being low in socioeconomic status can affect the way we think. A paper in Science in 2013 found that “a person’s cognitive function is diminished by the constant and all-consuming effort of coping with the immediate effects of having little money, such as scrounging to pay bills and cut costs.” The cognitive cost of poverty, that study found, was practically like losing an entire night of sleep. Another study from last year found that people who had lived in poverty performed worse than those who had never been poor on tests of verbal memory, processing speed, and executive functioning.

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Specifically, these low- income children had less gray matter in their frontal lobes, temporal lobes, and hippocampuses, which are brain regions involved in controlling attention, regulating the emotions, learning letters and words, and How Childhood Trauma Adversely Affects Decision-Making.

Further, we found that increases in income were associated with the greatest increases in brain surface area among the poorest children. Our clinical trial is designed to provide strong evidence regarding whether and how poverty reduction promotes cognitive and brain development.

“I think this [PNAS paper] builds on the past work on cognitive function and poverty,” said Jiaying Zhao, a psychologist at the University of British Columbia and the author of the 2013 study. “This shows how chronic poverty can influence brain anatomy. This paper provides the neural evidence.”

In the PNAS study, the relationship between socioeconomic status and the brain measures didn’t hold up for the very youngest adults (those aged 20 to 34) or the very oldest adults (those over 64) in the sample. It could be that only the healthiest people among the low-socioeconomic status groups survived to old age, or that by the time people reach their 70s and 80s, social and economic determinants are less important to their brain health than is the biological aging process. Also, this study included very few people below the poverty line, which is the condition the earlier papers were largely studying.

Still, together, this line of research suggests that being poor (or at least not rich) might be at least in part a self-perpetuating cycle. The people who are less wealthy struggle to cover their expenses. They get stressed, remember worse, and thus perform worse at the very same cognitive tasks that tend to increase wealth in today’s information economy.

Or, as Zhao put it in 2013, “Previous views of poverty have blamed poverty on personal failings, or an environment that is not conducive to success. We’re arguing that the lack of financial resources itself can lead to impaired cognitive function. The very condition of not having enough can actually be a cause of poverty.”

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