Transcranial Current Stimulation as a Treatment for Auditory Hallucinations in Schizophrenia

Inclusion Criteria: * Diagnostic and Statistical Manual IV (DSM-IV) diagnosis of schizophrenia, any subtype, or schizoaffective disorder, with refractory auditory hallucinations. Duration of illness \>1 year. * 18-99 years old. * Clinically stable for at least 12 weeks, i.e. not requiring hospitalization or a change in level of care . * On current antipsychotic doses for approximately 4 weeks or more. * Capacity to understand all relevant risks and potential benefits of the study (informed consent) OR has a legal guardian who can complete consent forms on the patients behalf * Right handed Exclusion Criteria: * Subjects with a DSM-IV diagnosis of alcohol or substance abuse (other than nicotine) within the last month or a DSM-IV diagnosis of alcohol or substance dependence (other than nicotine) within the last 6 months. * History of significant head injury/trauma, as defined by loss of consciousness for more than 1 hour, or recurring seizures, or requiring later cognitive rehabilitation or causing cognitive sequelae. * Prior brain surgery. * Any brain devices/implants, including cochlear implants and aneurysm clips. * Co-morbid neurological condition (i.e. seizure disorder, brain tumor). * Medical or neurological illness (unstable cardiac disease AIDS, malignancy, liver or renal impairment) or treatment for a medical disorder that could interfere with study participation. * Non English speakers. * Pregnancy, nursing, or if female and fertile, unwilling to use appropriate birth control measures during study participation