Studying the Effects of Brain Stimulation on Cognitive Control and Associated EEG in Human Subjects.

Inclusion Criteria: * Adult patients who are undergoing electroencephalographic (EEG) monitoring as part of a standard clinical procedure for the treatment of pharmacologically resistant epilepsy at University of Cincinnati Medical Center. Exclusion Criteria: * Patients who have cognitive or physical impairments that would limit their ability to participate in the cognitive testing will be excluded from the study. Other exclusions include adults unable to consent, non-English speaking patients, children age 17 and younger, pregnant women (note: pregnant women are not candidates for intracranial EEG monitoring), and prisoners.