This research is being done to collect preliminary data on the potential of computerized "brain-training" exercises for treating Long COVID symptoms in older adults. The investigators hypothesize that computerized brain-training will be an acceptable and feasible intervention for treating Long COVID symptoms in older adults. The investigators also expect to provide initial evidence that computerized brain-training has potential for improving thinking, mood, and other aspects of everyday functioning in older adults with Long COVID.

Some patients who contract coronavirus disease 2019 (COVID-19), especially older adults, show lingering neuropsychiatric symptoms such as cognitive impairment, brain fog, and depression. These neuropsychiatric symptoms-commonly referred to under the umbrella term "Long COVID"-are debilitating and may last for months or even years after viral infection. The purpose of the present study is to help address this public health crisis by determining whether computerized "brain-training" treatment has potential for improving thinking, mood, and other aspects of functioning in older adults with Long COVID. More specifically, the first aim is to determine the acceptability and feasibility of using brain-training treatment in individuals with Long COVID. The second aim is to evaluate for potential efficacy by determining whether brain-training treatment appears to improve cognitive function, mood, and other aspects of daily functioning in Long COVID.

Inclusion Criteria:

• prior history of COVID-19 based on Centers for Disease Control and Prevention (CDC) guidelines including a positive laboratory test (e.g., nucleic acid amplification test) or a positive rapid test
• age ≥ 60 years old
• current self-reported cognitive symptoms persisting after the acute phase of the illness (i.e., >4 weeks after COVID-19 symptom onset) that cannot be explained by alternative diagnoses
• evidence of subjective cognitive impairment with a Functional Assessment of Cancer Therapy - Cognitive Function (FACT-Cog) Perceived Cognitive Impairment (PCI) Subscale Score of ≤ 40 and/or endorsing any item on the FACT-Cog PCI Subscale as occurring nearly every day or several times a day
• Telephone Interview for Cognitive Status (TICS) ≥ 27
• fluent in English
• off psychiatric medications or on a stable dose for at least 1 month prior to commencing the study with no intention to change dose prior to completion of the study.

Exclusion Criteria:

• history of neurological disorder or other medical condition with potential to impair cognitive functioning or interfere with study participation (e.g., epilepsy, stroke, dementia, head trauma followed by persistent neurological deficits or known structural brain abnormalities)
• prior diagnosis of Mild Cognitive Impairment (MCI) or Mild Neurocognitive Disorder unrelated to the participant's history of COVID-19
• history of significant psychiatric illness per Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5), criteria that may interfere with study participation or confound results (e.g., schizophrenia or other psychotic disorder, bipolar and related disorders, major depressive disorder with psychotic features, personality disorder)
• history of significant neurodevelopmental condition that may interfere with study participation or confound results (e.g., intellectual disability, autism spectrum disorder)
• alcohol or other substance use disorder within the past 2 years
• significant sensory or motor impairments (e.g., blindness) that may interfere with the ability to complete neuropsychological measures or engage in the intervention