Evidence for specificity of ERP abnormalities during response inhibition in ADHD children: A comparison with reading disorder children without ADHD |
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| Authors: | Mario Liotti Steven R Pliszka Kellie Higgins Ricardo Perez III Margaret Semrud-Clikeman |
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| Institution: | 1. Department of Psychology, Simon Fraser University, Burnaby, Canada;2. Department of Psychiatry, University of Texas Health Science Center at San Antonio, TX, USA;3. Research Imaging Center, University of Texas Health Science Center at San Antonio, TX, USA;4. Department of Educational Psychology, University of Texas at Austin, TX, USA;5. Department of Psychiatry, Michigan State University, East Lansing, MI, USA;6. Department of Psychiatry, University of Nottingham, Nottingham, UK |
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| Abstract: | Executive function and working memory deficits are not only present in ADHD, but also in reading disorder (RD). Here, high-density ERPs were recorded during the Stop Signal Task in 53 children and adolescents: An ADHD-combined type group, a group with RD, and a healthy control group. The ADHD-C group displayed unique abnormalities of the frontal N200. Both healthy controls and RD groups showed a success-related right frontal N200 modulation, which was absent in the ADHD group. Second, for Success Inhibition trials, the ADHD-C had smaller right frontal N200 waves relative to healthy controls, while the RD group did not. In contrast, NoGo-P3 abnormalities were present both in the ADHD-C and RD groups. Impaired early response inhibition mechanisms, indexed by the frontal N200, appear to be limited to ADHD-C. In contrast, deficits in later cognitive control and error monitoring mechanisms, indexed by the NoGo-P3, appear to be present in both conditions. |
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| Keywords: | ADHD Reading disorder Event-related potentials Stop Signal Task Inhibitory control N200 NoGo-P3 |
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