Characterizing the EEG Signature of Fentanyl and Its Association With Drug Liking

Inclusion Criteria: 1. 18 years old or above (male and female) 2. American Society of Anesthesiologists (ASA) physical status classification of I, II or III 3. Candidates scheduled for general surgical procedures under general anesthesia and receive fentanyl for surgery Exclusion Criteria: 1. Craniofacial abnormalities 2. Known or suspected difficult intubation or mask ventilation 3. Known or suspected need for rapid sequence induction and intubation 4. Body mass index above 45 kg/m2 5. Allergies to fentanyl 6. History of obstructive sleep apnea requiring CPAP 7. History of obstructive or restrictive lung disease 8. Opiate use within 24 hours 9. History of opiate abuse within the last 3 years 10. Known or suspected severe chronic pain condition that require use of opiates or limit daily activities 11. MRI contraindications, such as presence of pacemakers, aneurysm clips, artificial heart valves, ear implants, metal fragments, or foreign objects in the eyes, skin, or body