caa a22 4500 475739876 CHVBK 20180406123456.0 cr unu---uuuuu 170329e20000601xx s 000 0 eng 10.1023/A:1005192220001 doi (NATIONALLICENCE)springer-10.1023/A:1005192220001 Naming Speed Performance and Stimulant Effects Indicate Effortful, Semantic Processing Deficits in Attention-Deficit/Hyperactivity Disorder [Elektronische Daten] [Rosemary Tannock, Rhonda Martinussen, Jan Frijters] This study investigated rapid automatized naming and effects of stimulant medication in school-age children with attention-deficit/hyperactivity disorder (ADHD) with and without concurrent reading disorder (RD). Two ADHD groups (67 ADHD only; 21 ADHD + RD) and a control group of 27 healthy age-matched peers were compared on four variables: color naming speed, letter naming speed, phonologic decoding, and arithmetic computation. Discriminant function analysis (DFA) was conducted to predict group membership. The four variables loaded onto two discriminant functions with good specificity: phonologic decoding, letter naming speed, and arithmetic defined the first function; color naming speed defined the second function. Both ADHD groups were significantly slower in color naming than controls, but did not differ from one another. DFA correctly classified 96% of the control group, 91% of ADHD + RD, and 82% of ADHD only. A subset of children in the ADHD groups participated subsequently in an acute, randomized, placebo-controlled, crossover trial with three single doses (10, 25, 20 mg) of methylphenidate. Methylphenidate selectively improved color-naming speed but had no effect on the speed of naming letters or digits. These findings challenge the tenet that naming speed deficits are specific to RD and implicate naming speed deficits associated with effortful semantic processing in ADHD, which are improved but not normalized by stimulant medication. Plenum Publishing Corporation, 2000 Attention-deficit/hyperactivity disorder nationallicence reading disorder nationallicence naming speed nationallicence methylphenidate nationallicence Tannock Rosemary Brain & Behavior Research Program, The Hospital for Sick Children, Toronto, Ontario, Canada aut Martinussen Rhonda Brain & Behavior Research Program, The Hospital for Sick Children, Toronto, Ontario, Canada aut Frijters Jan Brain & Behavior Research Program, The Hospital for Sick Children, Toronto, Ontario, Canada aut Journal of Abnormal Child Psychology Kluwer Academic Publishers-Plenum Publishers 28/3(2000-06-01), 237-252 0091-0627 28:3<237 2000 28 10802 https://doi.org/10.1023/A:1005192220001 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1005192220001 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Tannock Rosemary Brain & Behavior Research Program, The Hospital for Sick Children, Toronto, Ontario, Canada aut NATIONALLICENCE 700 1- Martinussen Rhonda Brain & Behavior Research Program, The Hospital for Sick Children, Toronto, Ontario, Canada aut NATIONALLICENCE 700 1- Frijters Jan Brain & Behavior Research Program, The Hospital for Sick Children, Toronto, Ontario, Canada aut NATIONALLICENCE 773 0- Journal of Abnormal Child Psychology Kluwer Academic Publishers-Plenum Publishers 28/3(2000-06-01), 237-252 0091-0627 28:3<237 2000 28 10802 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer