Imaging Brain Fluids During Breathing

Exclusion Criteria

• •No ferrous metal implanted in head or body
• •No history of major head trauma
• •No neurological or psychiatric disorder
• •Not using medication that affects brain function
• •No implanted electronic devices (e.g. pacemaker)
• •No implant that poses an MR contraindication
• •Not pregnant, suspect they are pregnant, or seeking to become pregnant
• •Not claustrophobic
• •No piercings or jewelry that cannot be removed
• •Does not weigh more than 250 pounds
• •Normal or contact-corrected normal vision
• •Exclusion for transcutaneous vagus nerve stimulation (tVNS) arm:
• •Conditions of skin or anatomy that affect left auricle or forehead skin and could impact placement of electrodes for tVNS or forehead stimulation
• •Diagnosis of significant cardiovascular or cerebrovascular disease \[e.g. congestive heart failure, stroke, cardiac conduction disorders (including: bundle branch block, heart block, long Q-T syndrome), history of asystole or non-sustained ventricular tachycardia.
• •Bradycardia (defined as resting heart rate \<50 bpm)
• •Hypotension defined as blood pressure \<90/60 mmHg