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• W2113754559 startingPage "1990" @default.
• W2113754559 abstract "OBJECTIVE: Recent studies have suggested that attention deficit hyperactivity disorder (ADHD) is associated with abnormalities in basal ganglia and prefrontal cortical functioning. However, these studies have primarily relied upon cognitive tasks that reflect impulse control rather than attentional mechanisms. METHOD: The authors used functional magnetic resonance imaging to investigate the neural correlates of selective and divided attention in a randomized, double-blind, placebo-controlled pharmacological challenge with methylphenidate in 15 adolescents with ADHD (ages 14–17), eight adolescents with reading disorder (ages 12–17), and four adolescents with both reading disorder and ADHD (ages 14–18) who were scanned during both a methylphenidate and a placebo session. Fourteen healthy comparison subjects (ages 12–20) who were not given methylphenidate served as the primary comparison group. RESULTS: During the divided attention task, unmedicated subjects with ADHD or reading disorder recruited the left ventral basal ganglia significantly less than the healthy comparison subjects. Methylphenidate led to an increase in activation in this region but had no effect on task performance. Subjects with ADHD also recruited the middle temporal gyrus significantly less than the comparison subjects, but methylphenidate did not have a direct effect on activation in this region. CONCLUSIONS: These results suggest that ADHD is associated with abnormal processing in attentional networks, with specific dysfunction in striatal circuitry. Methylphenidate may act to normalize activity within this network." @default.
• W2113754559 created "2016-06-24" @default.
• W2113754559 creator A5079228306 @default.
• W2113754559 date "2004-11-01" @default.
• W2113754559 modified "2023-10-11" @default.
• W2113754559 title "The Effects of Methylphenidate on Neural Systems of Attention in Attention Deficit Hyperactivity Disorder" @default.
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• W2113754559 doi "https://doi.org/10.1176/appi.ajp.161.11.1990" @default.
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