A new study conducted in India and US has found that poorness and its related problems can reduce a person’s cognitive abilities, which leaves him with less brain power to devote to other areas of life.
Researchers found that this mental strain can rob off poor people up to 13 IQ (Intelligent Quotient) points.
The international team of researchers said that this destitution leads to poor people making mistakes and bad decisions that may accentuate their financial woes.
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, researchers said.
A person is left with fewer "mental resources" to focus on complicated, indirectly related matters such as education, job training and even managing their time, they said.
A steep drop in cognitive function similar to a 13-point dip in IQ, or the loss of an entire night’s sleep is exhibited by a person pre-occupied with monetary problems.
When their concerns were benign, low-income individuals performed competently, at a similar level to people who were well off, said corresponding author Jiaying Zhao, who conducted the study in the lab of co-author Eldar Shafir from Princeton University, US.
"These pressures create a salient concern in the mind and draw mental resources to the problem itself. That means we are unable to focus on other things in life that need our attention," said Zhao, a University of British Columbia professor.
"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," said Zhao in the study published in journal Science.
The mental tax that poverty can put on the brain is distinct from stress, Shafir said.
The first set of experiments took place in a New Jersey mall between 2010 and 2011 with roughly 400 subjects chosen at random.
To better gauge the influence of poverty in natural contexts, between 2010 and 2011 the researchers also tested 464 sugarcane farmers in India who rely on the annual harvest for at least 60 per cent of their income.
Because sugarcane harvests occur once a year, these are farmers who find themselves rich after harvest and poor before it. Each farmer was given the same tests before and after the harvest, and performed better on both tests post-harvest compared to pre-harvest, researchers said.
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