Kids and teens with attention deficit/hyperactivity disorder (ADHD) lag behind others of the same age in how quickly their brains form connections within, and between, key brain networks, according to a new study based on the examination of more than 750 adolescents.

The result: Less-mature connections between a brain network that controls internally-directed thought (such as daydreaming) and networks that allow a person to focus on externally-directed tasks. That lag in connection development may help explain why people with ADHD get easily distracted or struggle to stay focused.

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