EXercise-induced PhysioLogical Adaptations In Neurological Disorders

Inclusion Criteria: * 18 years or older * Clinical diagnosis of one of the following neurological diseases: epilepsy, functional neurological disorder, mild cognitive impairment, dementia, Parkinson's disease, concussion, brain tumor [for participants with neurological diseases] * No diagnosis of neurological disease [for healthy control participants] Exclusion Criteria: * Non-english speaking individualsLanguage * Exercise contraindications (e.g., physical impairments limiting use of bicycle ergometer, acute infections, severe heart disease, uncontrolled hypertension, exercise associated seizures) * Current use of medications for cardiac rhythm or rate control * Magnetic resonance imaging (MRI) contraindications (e.g., electrical implants, ferromagnetic implants or objects, pregnancy)Pregnancy