Inclusion Criteria:  Ability to provide informed consent A diagnosis of PASC as indicated by past COVID-19 infection, and persistent symptoms, including 'brain fog', confusion, short-term memory deficits, trouble concentrating, delirium, difficulties in multitasking.  Exclusion Criteria:  History of epilepsy Metallic implants in the head and neck, Brain stimulators Pacemakers Pregnancy Active substance dependence (except for tobacco) Premorbid major neurological illness Severe mental illness (e.g., bipolar disorder, schizophrenia) ADHD