Ultrasound zaps brain to speed up waking from anesthesia

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Healthy study participants with American Society of Anesthesiologists (ASA) Physical Status Classification System-1 status * The participants will be right-handed adults * Body mass index (BMI) less than 30. * All subjects will be English speakers. Exclusion Criteria: * Medical contraindication to MRI scanning; are unable to undergo MRI scanning because of possible pregnancy or currently breastfeeding, * BMI\>30, * metallic substances in the body, claustrophobia, anxiety, or cardiopulmonary disease; or have an intracranial structural abnormality on T1-weighted MRI scans. * History of allergy to propofol, dexmedetomidine, any components of propofol or dexmedetomidine, eggs or egg products, soybean or soybean products, * Neurological, cardiovascular, or pulmonary illness; * Significant head injury with loss of consciousness; * Learning disability or other developmental disorder; sleep apnea or any severe snoring history; gastroesophageal reflux disease (GERD) or heartburn; pancreatitis or a history of pancreatitis, or sensory/motor loss sufficient to interfere with performance of the study; epilepsy/seizure disorder (including a history of seizures) or stroke (including a history of stroke). * Participants with tattoos in the head or neck region will be excluded from study; other tattoos are subject to determination by investigators based on their assessment regarding participant safety. * Recent food or liquid intake (within 8 hours). * History of drug use, have a positive drug screen, are unwilling to abstain from alcohol for 24 hours prior to dosing, or have a current history of nicotine use. -----Negative pregnancy test result, if applicable. * Potential participants who have participated in a clinical trial using an investigational drug or device within 30 days will be considered for enrollment after 30 days.