 1. Neurological illnessesconditions, such as motor or vocal tics including a diagnosis of Tourettes syndrome, head trauma with significant loss of consciousness 30 min, cerebral ischemia, carotid artery disease, epilepsy, brain tumor, dementia including mild cognitive impairment and Alzheimers disease, chronic meningitis, multiple sclerosis, pernicious anemia, normal-pressure hydrocephalus, HIV infection, Parkinsons disease, and Huntingtons disease. 