A Study of Alzheimer's Disease Using Magnetoencephalography (MEG) and the Synchronous Neural Interaction™ Test

Inclusion Criteria: * Subject enrolled and completed Orasi Protocol ADG 08-01 * Subject understands the study procedures and agrees to participate in the study by giving written informed consent. In the event the subject lacks the capacity to sign the consent form then the subject's Legally Authorized Representative (LAR) may sign on the subject's behalf. See Section 5. Informed Consent for details. * Subject is a non-smoker. * Subject is judged to be in good health other than AD, if applicable Exclusion Criteria: * Subject has a history or diagnosis of a significant neurological condition other than Alzheimer's disease including Parkinson's disease, vascular dementia, Lewy body dementia, frontal temporal dementia, human immunodeficiency virus, multiple sclerosis, seizures, epilepsy, stroke, ADHD, dyslexia, or severe traumatic brain injury. * Subject has a history of primary psychotic disorder (e.g. schizophrenia, schizoaffective disorder, delusional disorder) or bipolar disorder. * Subject has a Modified Hachinski Ischemia Scale (HIS) score greater than 4. * The subject has a recent history (within 2 years) of alcohol or substance abuse/dependence. * Subject had an MRI within two weeks prior to Study Visit 2. * Subject has metal dental braces, pacemaker or other common medical devices that may interfere with the MEG scan. * Subject is unable to complete the MEG scan procedure. * Investigator has any concern regarding the safe participation of a subject in the study, or if for any other reason the investigator considers the subject inappropriate for study participation