title: ADHD subtype differences in motivational responsivity but not inhibitory control: evidence from a reward-based variation of the stop signal paradigm.
abstract: In this study we examined prepotent motor inhibition and responsiveness to reward using a variation of the stop signal reaction time (SSRT) task in clinic- and community-recruited children ages 7 to 12 with attention-deficit/hyperactivity disorder-inattentive type (ADHD-I), ADHD-combined type (ADHD-C), and non-ADHD controls. Contrary to theoretical expectations, we found evidence for inhibitory weaknesses in ADHD-I. We also found evidence that although children with ADHD-I were able to improve their inhibitory control given reward-based motivation, the improvement depended on the order of reward conditions. Results suggest that the 2 primary subtypes of ADHD share similar neuropsychological weaknesses in inhibitory control but that there are subtype differences in response to success and failure that contribute to a child's ultimate level of performance.
authors.affiliation: Department of Psychology, Pennsylvania State University, University Park, PA 16802-3106, USA. clh39@psu.edu
authors.forename: Cynthia L
authors.initials: CL
authors.lastname: Huang-Pollock
authors.forename: Amori Yee
authors.initials: AY
authors.lastname: Mikami
authors.forename: Linda
authors.initials: L
authors.lastname: Pfiffner
authors.forename: Keith
authors.initials: K
authors.lastname: McBurnett
mesh_terms: D001289:Attention Deficit Disorder with Hyperactivity / Q000145:classification / Q000175:diagnosis* / Q000523:psychology; D002648:Child; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007266:Inhibition, Psychological; D008297:Male; D009042:Motivation; D010364:Pattern Recognition, Visual; D011597:Psychomotor Performance; D011930:Reaction Time; D012201:Reward; D014040:Token Economy