Remediation of Cognitive Dysfunction in Euthymic Bipolar Disorder Patients Using Transcranial Direct Current Stimulation (tDCS)

Inclusion Criteria: * Participants will be right-handed subjects aged 18-65 meeting DSM-IV diagnostic criteria for bipolar disorder, with no acute episodes of depression or mania within the previous 12 weeks * A score of ≤ 20 on the MADRS, and a score of ≤ 6 on the YMRS, who have been on a stable dose of mood stabiliser medications for at least 1 month. Exclusion Criteria: * Patients with high suicide risk * Co-morbid DSM-IV diagnosis of any psychotic disorder (current or within the last year), schizophrenia and schizoaffective disorder * Mental retardation * A history of drug or alcohol abuse or dependence within the last 3 months * Co-morbid attention deficit hyperactivity disorder (ADHD), or any neurological disorder * Recent stroke * Head injury * History of seizure, or who have had electroconvulsive therapy (ECT) within the 6 months preceding enrolment. * Participants will also be excluded if currently taking medications known to be associated with frank cognitive impairment (e.g., benzodiazepines).