Inclusion Criteria:

• In order to be eligible to participate in this study, patient volunteers must meet all of the following criteria:
• Ability of subject to understand and the willingness to review an informed consent
• Aged at least 18 years at the time of enrollment, and no older than 90 years of age.
• Identity of dominant hand
• 1. Question: Which hand would you choose to hold the pen to write a formal letter?
• 2. Note: no specific answer is required for inclusion, but it is required for the next question.
• English-Speaking:
• Ability to type without discomfort using non-dominant hand
• Enrolled in the screening phase of Protocol 000089 Post-Coronavirus Disease 19 Convalescence at the National Institutes of Health in the post-COVID convalescence arm (i.e. reports having started recovery from an acute COVID- 19 infection within past six month and is able to provide documentation of a positive COVID-19 PCR or antibody test)
• In order to be eligible to participate in this study, healthy volunteers must meet all of the following criteria:
• Ability of subject to understand and the willingness to review an acknowledgement of participation agreement
• Aged at least 18 years at the time of enrollment, and no older than 90 years of age
• English-speaking
• Ability to identify dominant hand
• 1. Question: Which hand would you choose to hold the pen to write a formal letter?
• 2. Note: no specific answer is required for inclusion, but it is required for the next question.
• Ability to type without discomfort using non-dominant hand
• Deny active infection with COVID-19, or ongoing symptoms following COVID-19 infection
• Ability to use an internet-connected laptop or desktop computer in a private setting located in the continental U.S. to complete the study task.
• This protocol can enroll NIH Employees/staff, including NINDS employees/staff. Staff members from our section and their immediate family members are excluded from participation.

Exclusion Criteria:

• Patient group: A patient who meets any of the following criteria will be excluded from participation in this study:
• A condition prior to the diagnosis of COVID-19 infection that would significantly confound interpretation of the behavioral task, as determined by the screening clinician (e.g., prior diagnosis of a neurologic condition such as large stroke, Alzheimer s disease or Parkinson s disease, or severe psychiatric condition).
• Staff from our section, and their immediate family members
• Healthy Volunteer group: A person who meets any of the following criteria will be excluded from participation in this study:
• A condition that would significantly confound interpretation of the research tests as determined by the screening clinician (e.g., prior diagnosis of a neurologic condition such as large stroke, Alzheimer s disease or Parkinson s disease, or severe psychiatric condition)
• Fever, respiratory symptoms or diagnosis of COVID-19 in the last 14 days.
• History of COVID-19 with residual neurologic symptoms following diagnosis that did not resolve within 14 days of disease onset.
• Previous participation in this study (platform filter).