APPROVAL SHEET Title of Thesis: “Neurocognitive features of Attention Deficit Hyperactivity Disorder in a Non-clinical Adult Sample” Name of Candidate: Su-Jong Kim Master of Science Degree

Title of Thesis: Neurocognitive Features of Attention Deficit Hyperactivity Disorder in a Non-clinical Adult Sample Su-Jong Kim, Master of Science, 2004 Thesis directed by: Wendy A. Law, Ph.D., Associate Professor Department of Medical and Clinical Psychology Cognitive difficulties are frequently documented in clinical Attention Deficit Hyperactivity Disorder (ADHD) samples. Whether these cognitive weaknesses are associated with ADHD symptoms in non-clinical samples is unknown. The current study examined the relationship between ADHD symptoms and cognitive performance in a non-clinical adult sample of 75 men and women (ages 20 to 49). Self-report measures of ADHD symptoms and neuropsychological assessments examining sustained attention, inhibition, impulsivity, and working memory were administered. Results revealed that: (1) individuals with high total ADHD scores had a difficulty in sustaining attention on a repeated trial task; (2) hyperactive/impulsive scores had a significant positive correlation with impulsivity but not with disinhibition; (3) inattentive scores had a negative trend correlation only with a simple auditory/verbal working memory task. The present study revealed that even the individuals with sub-clinical ADHD symptoms had similar difficulties associated with sustained attention, impulsivity, and simple verbal working memory in neurocognitive tests.