Brain Training for Substance Use Disorders

Inclusion Criteria: OUD patient participants: * Admitted into chemical treatment with opioid use being a reason for treatment; * DSM-IV-TR diagnosis of OUD; * Ability to provide informed consent; * A minimum of a 6th grade reading level; and * Able and willing to provide own contact information for follow-up visit(s). Control participants: * Age- and gender-matched to an OUD patient participant in the study; * Ability to provide informed consent; * A minimum of a 6th grade reading level; * Able and willing to provide own contact information for follow-up visit(s). Exclusion Criteria: OUD patient participants: * Refusal or inability to consent; * Pregnant; * History of serious neurological illness (e.g., Chronic seizure disorder, Wernicke-Korsakoff Syndrome, Epilepsy, Any history of seizures not caused by withdrawal from substances, Other \[please specify\]); * Inability to see text and photos clearly on the computer display; and * Unwillingness to change hairstyle (e.g., braids, pony tails, dreadlocks) or remove wig to accommodate application of the EEG headset, if necessary. Control participants: * Refusal or inability to consent; * Pregnant; * History of serious neurological illness (e.g., Chronic seizure disorder, Wernicke-Korsakoff Syndrome, Epilepsy, Any history of seizures, Other \[please specify\]); * Inability to see text and photos clearly on the computer display; * Current or previous problems using opioids, other prescription (prescribed or not prescribed) or illicit drugs; * Regular nicotine user (e.g., cigarette smoker, e-cig user) within the past 12 months; and * Unwillingness to change hairstyle (e.g., braids, pony tails, dreadlocks) or remove wig to accommodate application of the EEG headset, if necessary.