 Personality traits of impulsivity will be measured with the Barrett Impulsiveness Scale and the NEO Personality Inventory-Revised. Behavioral components of impulsivity will be tested through delay and probability discounting tasks. Finally, measures of frontotemporal functioning are also included in a neuropsychology and neurocognitive battery. Recent studies have shown that these areas of the brain function differently in pathological gamblers; thus, the following neuropsychologyneurocognitive tests have been included: AttentionInformation Processing Speed via Simple Reaction Time Task and Continuous Performance Task, Episodic Memory via Hopkins Verbal Learning Test-Revised and Brief Visuospatial Memory Test, ExecutiveFrontal Lobe Measures via Wechsler Memory Scale-III, Choice Reaction Time Task, Working Memory Task N-back, Probabilistic Reversal Learning Task, and Stop-Signal Task. Between group comparisons on this battery of impulsivity tests will be made to clarify which components of impulsivity are associated with pathological gambling. Secondly, within-group analyses will be performed to correlate impulsivity to gambling severity. Lastly, an exploratory analysis of subtyping pathological gamblers by performances on tasks of impulsivity and types of gambling will be conducted. 