 This project is designed to test how direct current DC electrical polarization of the brain affects language and behavior in patients with frontotemporal dementia FTD. FTD is the second most common form of dementia after Alzheimers disease. It causes profound disturbances of language and other cognitive functions and often results in highly disruptive behavior. There is no effective treatment for the behavioral disorder or cognitive deficits in FTD. In an earlier study, the researchers used DC polarization to the primary motor cortex to enhance prefrontal function in healthy subjects. The experiment resulted in greater verbal fluency. In a separate study of five patients with FTD, a similar effect on verbal fluency was produced. The object of the current study is to replicate these findings in a larger group of patients and to see if the results carry over into real world behavior. 