Inclusion Criteria:  Any sex, at least 19 years of age or older Able to understand the informed consent form, study procedures and willing to participate in study Able to remain seated and focused for 7 minutes In good health with no history of clinically relevant neurological illness or injury in the last 5 years  Exclusion Criteria:  Requires the use of hearing aids or a cochlear implant, diagnosed with tinnitus that is currently active, or has temporary damage to hearing (e.g. punctured ear drum). Implanted pacemaker or implanted electrical stimulators Metal or plastic implants in the skull, excluding dental/facial implants. Exposed to an investigational drug or device 30 days prior to start in this study, or concurrent or planned use of investigational drug or device while enrolled in this study Not proficient in English language Diagnosed epilepsy or history of seizures If female and of child-bearing potential: pregnant, suspected or planning to become pregnant or breast-feeding Unhealthy scalp (apparent open wounds and/or bruised or weakened skin) Allergy to EEG gel or history of contact dermatitis