Inclusion Criteria:

- adults over 18 years of age to 80;

- history of SARS-CoV-2 PCR+ at least 4 weeks prior to study entry; SARS-CoV-2
negative (PCR) at study entry;

- at least one persistent neurological symptom (impaired concentration, headache,
sensory disturbances, or depression, or "brain fog") that began around the time of
the acute COVID-19;

- willing and able to consent, complete all assessment and study procedures.

Exclusion Criteria:

- any chronic or remote neurological disorder (i.e. stroke, head trauma, epilepsy,
tumor);

- intellectual disability pre-existing to the Covid-19 episode;cardiovascular diseases
such as arrhythmia, heart failure, myocardial infarction, and patients with cardiac
pacemakers,

- acute brain injury or acute encephalopathy from another aetiology than covid (e.g.,
sepsis, liver or renal failure, alcohol or drug withdrawal, drug toxicity);

- documented pre-existing history of psychiatric illness, including substance abuse;

- open-heart cardiac surgery or cardiac arrest during the last 6 months;

- current hospitalization;

- pregnant women.