Targeting Auditory Hallucinations With Alternating Current Stimulation

Inclusion Criteria: * DSM-IV diagnosis of schizophrenia, any subtype, or schizoaffective disorder with refractory hallucinations. Duration of illness \>1 year * 18 - 70 years old * Clinical stable for at least 12 weeks i.e. not requiring any hospitalization or a change in level of care * On current antipsychotic doses for at least 4 weeks * Experience at least 3 auditory hallucinations per week * Stable auditory hallucinations as demonstrated by having less than or equal to 20% change in AHRS scores across a 2 week interval during the screening period * Capacity to understand all relevant risks and potential benefits of the study and to provide written informed consent, OR has a legal guardian who can provide the informed consent on the patient's behalf with the patient providing written assent to participate Exclusion Criteria: * 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 * Positive urine test of cannabis, cocaine, amphetamine, barbiturates, opiates * Current treatment (within 4 weeks) with psychotropic agents including benzodiazepines that are taken on a daily basis (limit prn use to greater than 48 hours before participating in a study session) * 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 * history of traumatic brain injury that required subsequent cognitive rehabilitation, or caused cognitive sequelae * A difference of greater than 20% in AHRS scores between screening visits * Prior brain surgery * Any brain devices/implants, including cochlear implants and aneurysm clips * Co-morbid neurological condition (e.g. seizure disorder, brain tumor) * Non English speakers * Female participants who are pregnant, nursing, or unwilling to use appropriate birth control measures during study participation * Anything that, in the opinion of the investigator, would place the participant at increased risk or preclude the participants' full compliance with or completion of the study