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I'm Rob Logan, Ph.D. senior staff National Library of Medicine for Donald Lindberg, M.D, the Director of the U.S. National Library of Medicine.
A pioneering set of studies, recently published in Science, are the first to suggest a strong association between income and cognitive capabilities.
Published together (and designed to be complimentary) the experimental and field-observation studies suggest for the first time that poverty (or low income) impedes the levels of cognitive function among adults. Cognitive function refers to memory, learning, and comprehension abilities.
In the authors’ U.S.-based experimental study, wealthier and lower income adults were asked to think about four scenarios which presented common financial challenges. In one scenario, participants were asked if they would get a loan, pay in full, or forego service when their automobile had continuing breakdowns. After thinking about how they might resolve the problems presented within the scenarios (that differed in their degree of complexity and consideration), participants took two unrelated, well-established cognitive assessment tests.
Overall, lower income persons scored significantly lower than higher income participants on all cognitive tests after exposure to the more complex scenarios. The two groups scored similarly after completing a financially less complicated challenge.
In a second series of financial scenarios and challenges, the authors removed most mathematical calculations to offset math anxiety among the participants. However even in the second experimental condition, the authors found higher income persons scored significantly higher overall than lower income participants on the cognitive tests.
In the field study, the authors followed 464 sugarcane farmers in India before and after annual harvests. The sugarcane farmers had a similar low-income baseline and experienced one short period of comparative financial prosperity within an otherwise, challenging year. Participants were interviewed before and after harvests and took tests that determined their levels of physiological stress.
Before the harvest, most participants reported they had to take out loans and pawn household items to meet expenses. Participants reported they experienced problems paying routine bills, and noted other difficulties coping with financial challenges. In contrast, few of the participants reported similar problems during the sugarcane harvest and immediate post-harvest.
The findings suggest most participants experienced more financial pressures (lower incomes) and higher stress before the harvest and were more prosperous and less stressed during the period after their sugarcane crop was sold. More importantly, reusing one of the cognitive tests from the experimental study, the authors found the scores among study participants improved significantly during the harvest and immediate post-harvest periods.
The authors explain the differences in cognitive test scores (pre and post harvest) remained highly significant after carefully controlling for the impact of stress levels.
The authors note the overall findings suggest low income (or poverty) creates significant distractions that undermine concentration, learning and memory. The authors conclude (and we quote): ‘The data reported here suggest a different perspective on poverty. Being poor means coping not just with a shortfall of money, but with a concurrent shortfall of cognitive resources. The poor, in this view, are less capable not because of inherent traits, but because the very context of poverty imposes load and impedes cognitive capacity. The findings, in other words, are not about poor people, but about any people who find themselves poor’ (end of quote).
The authors conclude the findings suggest the impacts of economic volatility and low income are more incapacitating than previously appreciated. Among an array of suggestions derived from the findings, the authors recommend interventions to improve health outcomes for low-income citizens should be more user friendly, reinforced by consistent reminders, and should be timed to launch during more prosperous eras.
Meanwhile, information about how to nourish your brain (from the American Academy of Family Physicians) is provided in MedlinePlus.gov’s mild cognitive impairment health topic page. MedlinePlus.gov’s mild cognitive impairment health topic page provides information about how to cope with mild cognitive impairment (from Virginia Polytechnic Institute and State University) in the ‘coping’ section.
MedlinePlus.gov’s mild cognitive impairment health topic page additionally provides links to the latest pertinent journal research articles, which are available in the ‘journal articles’ section. Links to clinical trials that may be occurring in your area are available in the ‘clinical trials’ section. You can sign up to receive updates about mild cognitive impairment as they become available on MedlinePlus.gov.
To find MedlinePlus.gov’s mild cognitive impairment health health topic page, type ‘cognitive impairment’ in the search box on MedlinePlus.gov’s home page. Then, click on ‘mild cognitive impairment (National Library of Medicine).’ MedlinePlus.gov also contains health topic pages on memory.
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