A Study of Human Multi-Sensory Integration

Inclusion Criteria: * Healthy volunteers ages 18-65 years old * American Society of Anesthesiologists (ASA) Physical Status I or II (i.e. healthy) * Body Mass Index \<30 kg/m2 * Easily visible uvula Exclusion Criteria: * Contraindications to administration of either propofol or ketamine * Allergy to either one of the medications or preservative in which it is diluted. * History (or current) seizure disorder * Contraindications to anesthesia * Significant cardiovascular disease (e.g. h/o hypertension, arrhythmias, myocardial infarction, congestive heart failure, congenital heart defects, coronary artery disease) * Increased risk factors for difficult intubation and/or ventilation * Obesity (BMI\>=30 kg/m2) * Mallampati class \> 2. * History of or current obstructive sleep apnea. * Increased risk of aspiration * Any per oral intake within 8 hours of anesthetic exposure * Conditions that delay gastric emptying (e.g. obesity, hiatal hernia, gastro esophageal reflux disease, pregnancy, etc.) * Pulmonary disease (e.g. chronic obstructive pulmonary disorder, asthma requiring rescue inhaler within last month, emphysema, pulmonary hypertension, pulmonary fibrosis etc). * Neurological disease. Patients with history of strokes, seizures, brain surgery, brain tumor, increased intracranial pressure. * Psychiatric disease. History of or presents of psychosis, schizophrenia, schizo-affective disorder. * Specific Medication Current Use. History of or current intake of antipsychotic…