active and/or chronic neurological, psychiatric (including depression), or medical conditions

psychoactive medication use

active drug/alcohol dependence or abuse history

homelessness or other social situation that would preclude consistent visits

history of head injury (including neurosurgery)

history of seizure

inability to comprehend or participate in the procedures involved

metal in the head (besides in mouth), such as implanted electrodes or devices, shrapnel, surgical clips, or fragments from welding/metalwork

implanted devices (such as cardiac pacemakers, medical pumps, or intracardiac lines) in the thorax

Neurophysiological and Functional Mechanisms of Motor Control and Learning