Inclusion Criteria:  men or women (18-50 yrs old) with a DSM 5 SCZ diagnosis, If female, negative urine pregnancy test significant cognitive impairment (1 SD below the norm on the working memory/executive functioning task performance) feasibility for tDCS interventions according to safety guidelines stable medication regime especially the classical neuroleptics and all CNS-activating medications, if taken, 4-6 weeks before the experiment fluency in the native language right-handed ability to provide informed consent.  Exclusion Criteria:  pregnancy alcohol or substance dependence history of seizure history of neurological disorder history of head injury Presence of ferromagnetic objects in the body that are contraindicated for MRI of the head (pacemakers or other implanted electrical devices, brain stimulators, some types of dental implants, aneurysm clips, metallic prostheses, permanent eyeliner, implanted delivery pump, or shrapnel fragments) or fear of enclosed spaces). Eligibility will be determined by the "MRI Safety Screening Questionnaire" and verified, if necessary, by a radiology consultant.