Children who spend seven hours or more on smartphones and tablets are changing the structure of their brains and risking lower IQs and declining memory and cognitive function

Children who use screens for seven hours or more a day are showing signs that their brain cortex is thinning prematurely.

The findings show that children are at risk of deteriorating memory function, perception skills and cognitive abilities, according to new major US study.

The ongoing $300 million (£236mn) research is funded by the National Institute of Health and shows results of the effects of technology on children.

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