 disorder subjects with a history of dependency that are not abstinent 3. 1 month. Subjects with a history of neurological diseases. Subjects with general medical illness eg CVD, hypertension, DM. Subjects prior to the implementation of neurocognitive testing report having consumed coffee, tea, alcohol or smoked three hours conducting assessments. Subjects who take more than 3 prescription drugs. Those who report being too tired. Subjects who report not having made an effort to answer the tests. 