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Research has shown that there is a relationship between language ability (language mechanics, expression, and vocabulary) and behaviour problems. Children with poorer language ability were reported to show more behaviour problems relative to peers with better language ability. What do you think the direction of effect is?
There is some evidence for a bidirectional association. However, the main direction of effect was generally stronger from language ability to behaviour problems than from behaviour problems to language ability.
Study 2 suggested that the effect of language ability on later behavior problems was stronger than the effect of behavior problems on later language ability, suggesting that the direction of effect is from language ability to behavior problems.