The study found that participants who watched TV more than three hours a day when they were young run twice more risk of having cognitive problems throughout his adult life than those who are more active and spend less time in front of a screen.
A total of 3 000 247 adults, aged 18 30, they were followed during the study, published in the Journal of the American Medical Association (JAMA) Psychiatry.
The researchers tested their cognitive activities after 25 years through three tests to assess their reflective quickly, executive functions and verbal memory.
“The participants habits less active life, ie with little physical activity and too much television, were more likely to have poor performance on cognitive tests,” says the study. However, verbal memory was not affected by an overdose of television
Andrew Przybylski, a psychologist at Oxford University who was not involved in the work, questioned the study. “First, your data are based on a measurement made by the participants of the time they spend watching television, this can be problematic. “
On the other hand, those involved did not perform cognitive tests at baseline, allowing have baseline data. Also, “almost one in three did not attend the end of the study,” which weakens the conclusions of the work, regretted Przybylski.
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