الفهرس 
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Abstract
Attention Deficit Hyperactivity Disorder (ADHD) is the most common emotional, cognitive and behavioral disorder in children. ADHD has been hypothesized to be results from structural defects in brain networks influencing cognitive and motor behavior or dysfunction of the central nervous system. EEG is a useful source of information on the background state of the brain, indexing the substrate of cognition and behavior, so it appears to be an appropriate tool for assessing this disorder. This study evaluates cognitive function in children with different types of ADHD; detect the EEG changes in different aspects of ADHD and study the correlation between cognitive function and EEG changes among different subtypes of attention deficit hyperactivity disorder children. The study group (60 children) was divided into three subgroups according to the 3 subtypes of ADHD. All children were between the ages of 5 and 14 years. Neuropsychiatric assessment, electroencephalographic (EEG) study and intelligence quotient (IQ) testing were done to all ADHD subtypes. The study showed that the majority in all subtypes of ADHD had average IQ with no significant difference between different types of ADHD regarding their visual and auditory short term memories. Also revealed that 47% of all ADHD groups has electroencephalographic changes. There were significant differences among ADHD subtypes regarding intensity of LT frontal alpha wave, which was significantly increased in combined ADHD group more than in inattention and hyperactive-impulsive ADHD groups, but there were no significant differences between ADHD groups regarding intensity of other EEG waves. The study showed that RT frontal beta wave changes is significantly increased in low average and high average IQ than in average IQ in ADHD children and that LT occipital alpha wave changes is significantly increased in high average IQ than in low average, average IQ and superior IQ in ADHD children. There was no significant correlation between EEG changes and visual short term memory deficit in ADHD children. On the other hand the study demonstrated a significant increase in LT frontal delta and LT temporal beta &delta waves changes in ADHD children with auditory short term memory deficit. The study concluded that there were correlation between some EEG changes and some cognitive function indicators.