Review Question - QID 109707

A 26-year-old man presents to the emergency department with complaints of intractable, 10/10 abdominal pain without nausea or vomiting. His CT is unremarkable, and other aspects of his history and physical examination suggest that his complaints may not be organic in etiology. His medical record is notable for previous ED visits with similar complaints that had resolved on one occasion with narcotic agents. A previous psychiatric evaluation reports a long history of migraines, depression, and characteristics of antisocial personality disorder. Which of the following best explains his abdominal symptoms?