Effect of Discontinuing Propofol After Cecal Intubation on Patient's Psychomotor Recovery Following Colonoscopy

Inclusion Criteria: * Age between 18 and 80 years. * Scheduled ambulatory elective screening or surveillance colonoscopy under MAC. Exclusion Criteria: * Medical contraindication to anesthesia (i.e., respiratory/cardiac/neurologic compromise, known allergy or adverse reaction to propofol, midazolam, lidocaine, or opiates, …) * History of ischemic or hemorrhagic cerebrovascular accident. * Baseline cognitive dysfunction (impaired memory, attention deficit, language disorders, …) - in other words, any dysfunction that prevents the subject from understanding the study protocol and/or completing the requested tests and assessments (e.g., playing the minigames, …) * Use of more than one psychoactive drug. * History of partial colectomy. * Unable to give consent.