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mental

mastery

/ˈmɛn.təl/adjnoun

card 1 of 10 · context meaning

What does 'mental' mean in this sentence?

Irregular bedtimes may disrupt healthy brain development in young children, according to a study of intelligence and sleeping habits. Going to bed at a different time each night affected girls more than boys, but both fared worse on mental tasks than children who had a set bedtime, researchers found.