Normal Quantitative EEG (qEEG) Dataset

Inclusion Criteria: * Men and women, from 18 to 55 years old at the time of study enrollment. Women who are greater than 6 weeks post-partum, who are breastfeeding are allowed to participate if they are able to finish the electroencephalography (EEG) without interruption. * Able to speak and read English as their primary language. * Agrees to, and appears able to, participate in all outcome assessments. * Demonstrates the ability to offer informed consent and signs the study informed consent document. Exclusion Criteria: * Vulnerable populations including, prisoners, pregnant women, and minors. * Women who are less than 6 weeks post-partum. * Unwilling or unable to participate in planned study visits. * Any past history of brain injury due to trauma, surgery, hypoxia, infection, inflammation, toxicity (e. g., carbon monoxide poisoning), or cerebrovascular etiology. * Individuals with a diagnosis of, or a persistent history of, or symptoms of a neurological disorder (e.g., tinnitus, vertigo, chronic fatigue, numbness, tingling, chronic migraine, fibromyalgia, multiple sclerosis). * Currently undergoing therapy for affective disorders, behavioral disorders, or psychological disorders. * Diagnosis of post-traumatic stress disorder or sub-clinical post-traumatic stress symptoms. * Diagnosis of diabetes mellitus, type 1 and type 2. * Current complaints of brain injury symptoms such as cognitive or affective problems. * Known neuroimaging abnormalities. * Participants taking daily prescription drugs or oral over the counter medications beyond vitamins that could impact a normal outcome determined by the Principal Investigator (e.g., beta blockers). * Participants who are ≥45 may be taking statins or angiotensin converting enzyme (ACE) inhibitors. * Participants between the ages of 18-55 may be taking antidepressants indicated for depression or post-partum depression. * Oral or injectable contraceptives are permitted * Known atrial septal defect, including but not limited to patent foramen ovale. * History of bypass surgery. * History of hydrocephalus/microcephaly/macrocephaly. * History of developmental delay or learning disorder as a child. * Previous or current use of any illicit drug, at any age. * Current positive urine drug test for any illicit substance. * History, by self-report in the last year, of alcohol abuse. * Current or previous tobacco use, with the exception of minimal use during adolescence. * Use of any assistive hearing device, or unable to verbally communicate due to hearing loss. * History, by self-report, of receiving chemotherapy drugs or therapeutic ionizing radiation to the head. * Foreign material in the head. * Active malignancy or prior malignancy (except basal cell carcinoma) within the last 5 years. * Unable to abstain from caffeine products for at least a 2 hour interval.