Testing Effectiveness of a Stochastic Noise Stimulator to Immediately Improve Balance and Gait

Inclusion Criteria Older (ages 60+) and younger (aged 21-59) participants with no significant health history will be recruited from the community. Exclusion Criteria Any person with a self-reported history of: * impaired proprioception * significant eye problems * neuromuscular disease * seizure * stroke * unmedicated diabetes * cardiovascular disease (except controlled hypertension) * renal disease or electrolyte imbalance * orthopedic disorders such as severe neck or back pain * uncontrolled high blood pressure (200/110 or greater) * implanted electronic devices (pacemakers, defibrillators, implanted pumps or stimulator devices, cochlear, etc.) * psychotic medications or current psychotic symptoms * Any other psychiatric condition requiring hospitalization since 1991 * recent history of alcohol or drug abuse within the past 6 months * inability to stand unassisted for 30 seconds or walk unassisted for 6 minutes