Research conducted at Britain's University of Nottingham appears to indicate that children with ADHD have an impaired ability to turn off a "daydreaming switch" in their brain. This "daydreaming" function is designed to help the brain pass time when not focused on a particular task -- but the inability to turn this feature off can create significant difficulties when the time comes to take on a tast that demands complete attention.
Richard Alleyne, the science correspondent for The Telegraph, described this research:
Using a video game, researchers compared brain scans of eighteen children with ADHD, aged between nine and 15 years old, against scans of a similar group of children without the condition.
The children with ADHD were tested when they were taking their methylphenidate and when they were off their medication.
By studying the brain scans, the researchers were able to show that typically developing children switched off their DMN network whenever they saw an item requiring their attention.
However, unless the incentive was high, or they had taken their medication, the children with ADHD would fail to switch off the DMN and would perform poorly.
Dr Martin Batty, co-author of the study, said: "Using brain imaging, we have been able to see inside the children's heads and observe what it is about ADHD that is stopping them concentrating.
The team's findings were published in the Journal of Child Psychology and Psychiatry.
Labels: brain_activity, health, brain_chemistry
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