The following battery of tests will take approximately 90 minutes (at both baseline and 12-week follow-up) to complete and will be administered during the afternoon to avoid diurnal effects: Auditory Consonant Trigrams; Benton Visual Retention Test 5th Edition, Boston Naming Test, Buschke-Fuld Selective Reminding Test, Delis Kaplan Executive Function System (DKEFS), Color-Word subtest, DKEFS Tower Test, DKEFS Trail Making Test, DKEFS Verbal Fluency subtest, Purdue Pegboard, Rey-Osterrieth Complex Figure Test, Taylor Complex Figure Task, Wechsler Abbreviated Scale of Intelligence, and the Wechsler Adult Intelligence Scale-3rd Edition.