The purpose of this project is to explore the effects of transcranial alternating current stimulation (tACS) in children, adolescents and young adults with a 22q11.2 microdeletion. The main aim of the present research project is to investigate the effects of repeated, individually tuned high-density (HD) tACS on cognition (i.e., WM performance) and related neuroimaging markers in carriers of the 22q11DS. As cognitive deficits, most notably WM impairment, are among the earliest signs of psychotic disorders, interventions during adolescence aimed at reducing cognitive decline in at-risk individuals may prove effective in delaying or even preventing the later emergence of psychotic symptoms.