Effects of Intramuscular (IM) Oxytocin on Pupil Diameter and Heart Rate Variability (HRV)

Inclusion Criteria: * Male or female \> 18 and \< 66 years of age, * Body Mass Index (BMI) \<40 * Generally in good health as determined by the Principal Investigator based on prior medical history * Normal blood pressure and resting heart rate without medication Exclusion Criteria: * Hypersensitivity, allergy, or significant reaction to any ingredient of Pitocin® * Any disease, diagnosis, or condition (medical or surgical) that, in the opinion of the Principal Investigator, would place the subject at increased risk * Women who are pregnant (positive result for serum pregnancy test at screening visit), * Women who are currently nursing or lactating, women that have been pregnant within 2 years. * Neuropathy, chronic pain, diabetes mellitus, or taking benzodiazepines or pain medications on a daily basis. * Previous eye surgery, eye medications, cataracts