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In 24 children with developmental learning disabilities and 15 age-matched controls regional cerebral activity was studied with xenon-133 single photon emission tomography.In the 9 children with pure attention deficit and hyperactivity disorder(ADHD),the distribution of regional cerebral activity was abnormal-low in striatal and posterior periventricular regions and high in occipital regions.Low activity in striatal and posterior periventricular areas was also seen in the 8 children with ADHD in combination with phonologic-syntactic dysphasia.7 children with dysphasia,but without hyperactive behaviour,had low cerebral activity in left temporofrontal regions. |
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