Inclusion Criteria:  Age 18-100 Positive PCR for Sars-CoV-2 (except non-covid controls, who must be negative) Native language Finnish or Swedish Informed consent to study to study participation  Exclusion Criteria:  Age under 18 Pregnant or lactating Major neurologic diagnosis (TBI, dementia, stroke, Parkinson´s disease before covid-19) Substantially impaired hearing or vision Developmental disability. No consent to study participation Contraindication to MR imaging (such as cardiac pacemaker, allergy to contrast)