Inclusion Criteria:  Reports chronic pain (≥4 on 0-10 Numeric Rating Scale (NRS) on most days during the past 3 months) Prescribed opioids for pain management  Exclusion Criteria:  History of seizures Plans to have pain-related surgery in the next 3 months Has an implanted medical device that could experience interference during EEG, such as a spinal cord stimulator or pacemaker