An Evaluation of Neurocognitive Function, Oxidative Damage, and their Association with Treatment Outcomes in Methamphetamine and Cocaine Abusers

The primary objective of this study is to replicate the finding that performance on the Stroop color-word interference task is predictive of treatment completion in participants with cocaine use disorders and to extend this finding to participants with METH use disorders.  Secondary objectives include evaluating whether: 1.) performance on various neurocognitive tests, including the Stroop, Rey Auditory-Verbal Learning Test (RAVLT), Iowa Gambling Task (GT), Wisconsin Card Sorting Task (WCST), and the Barratt Impulsiveness Scale version -11 (BIS-11) is predictive of treatment attrition and stimulant use outcomes in METH/cocaine abusers; 2.) neurocognitive test performance is associated with oxidative damage, a severe consequence of oxidative stress, in METH/cocaine abusers; 3.)  oxidative damage, as assessed by two plasma measures, is predictive of treatment attrition and substance use outcomes in METH/cocaine abusers, and 4.)  oxidative damage in METH/cocaine abusers is significantly greater than that of a normal comparison group.