Clinical Research Directory

Inclusion Criteria: * 18-55 years old * Right handed * CNB use within past 2 years and felt "high" when used * Able to read, speak, and understand English * Able and willing to provide written informed consent, and willing to commit to study protocol. Exclusion Criteria: * Current marijuana tolerance, desire to cut down, or cravings to sue during periods of abstinence. * Strongly left-handed * Positive screen for drug or alcohol (except CNB) on test day will result in rescheduling the appointment * History of adverse effects with CNB * CNB users who are abstaining * Report of any psychotic disorder in a first degree relative * IQ \< 80 on the Wechsler Abbreviated Scale of Intelligence * Inability to comprehend written instructions using the WRAT-4 reading achievement test * Pregnant, breastfeeding, and ineffective birth control methods. * Unable or unsafe to have an MRI * Serious medical, neuro-ophthalmological, or neurological illness (e.g. cancer, seizure disorders, encephalopathy * History of head trauma with loss of consciousness \> 30 minutes or concussion lasting 30 days. * Focal brain lesion seen on structural MRI * Any medical/neurological condition that could compromise neurocognitive performance (e.g. epilepsy, multiple sclerosis, fetal alcohol syndrome). * Anyone deemed unsafe to study personnel for any reason