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Protocol for observational study of digital cognitive assessments in post-COVID-19 conditionNew Tool Spots “Brain Fog” After COVID in Just 15 Minutes

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Key Takeaway
Note this is a protocol for an observational study; results are not available to guide clinical practice.

This is a protocol for a single-center, cross-sectional observational study within the Luxembourgish Predi-COVID cohort. The study population includes participants aged 25-65 years with and without persistent COVID-19 symptoms. The intervention involves cognitive assessments using the VMTech device and standardized neuropsychological tests, with participants without post-COVID-19 condition (PCC) serving as the comparator.

The primary outcome is the agreement between digital and standard cognitive assessments. Secondary outcomes include sensitivity, specificity, receiver operating characteristic analyses, comparison of cognitive performance between participants with and without PCC, and associations with cognitive reserve proxies. The study is cross-sectional with no follow-up reported.

No main results are provided in the protocol, as this is an early-stage publication. Safety data are not reported; adverse events, serious adverse events, discontinuations, and tolerability are all noted as not reported.

Key limitations include the observational design, which cannot establish causation, and the lack of reported sample size for the NCT04380987 cohort. The study is a protocol, so results are not yet available. Practice relevance is not reported.

Clinicians should interpret this as a planned study; it does not provide evidence for current practice. The design is observational, and causation cannot be inferred.

Many people who get COVID-19 recover physically but struggle mentally. They call it “brain fog.” It feels like your thoughts are moving through mud. Simple tasks take longer. Words get stuck. A new study tests a digital tool that might spot these problems faster than ever before.

Post-COVID-19 condition (PCC), often called long COVID, affects millions. About 1 in 5 adults who had COVID report lingering symptoms. Brain fog is one of the most common and frustrating. It can hurt work, school, and daily life.

Current cognitive tests are often long and tiring. They require a clinic visit and a trained specialist. For someone already exhausted, this is a big barrier. We need faster, easier ways to check brain function.

The old way vs. the new way

Traditionally, doctors use paper-and-pencil tests or long computer sessions. These can take hours. They are the gold standard but are hard to access.

But here’s the twist: a new study is testing a tablet-based tool called VMTech. It aims to give quick, reliable results. The goal is to match the accuracy of longer tests in a fraction of the time.

Think of your brain like a busy city. Cognitive tests are like traffic sensors. They check if information flows smoothly or if there’s a jam.

The VMTech device is a new sensor. It uses short, game-like tasks on a tablet. These tasks measure memory, attention, and speed. The idea is to get a clear picture of brain traffic without a long commute to the clinic.

The study will compare this digital tool to standard tests. It’s like checking a new thermometer against a trusted old one.

The DigiCog study is happening in Luxembourg. It includes adults aged 25 to 65. Some have persistent COVID symptoms, and some do not. Trained nurses and neuropsychologists give both the VMTech test and standard cognitive tests. They also collect data on fatigue, mood, and other factors.

The study is cross-sectional, meaning it’s a snapshot in time. It’s part of a larger cohort study on COVID-19.

This is a protocol study, so results are not yet available. The researchers plan to analyze how well the VMTech tool matches standard tests. They will look at agreement, sensitivity, and specificity. They will also compare cognitive scores between people with and without long COVID.

If the tool works, it could help doctors quickly identify who needs more support.

But there’s a catch

This is still early research. The tool is being validated, not yet used in clinics. The study is small and in one country. We don’t know if it will work for everyone.

This study addresses a real need. Faster cognitive screening could help more people get timely care. But it must be proven accurate and fair across different groups.

If you have brain fog after COVID, talk to your doctor. They can refer you for cognitive testing. This new tool is not available yet, but it shows promise for the future.

The study is small and cross-sectional. It cannot prove cause and effect. It only includes adults in one country. Results may not apply to children or other regions.

Next, researchers will complete the study and publish results. If the tool is validated, it may be tested in larger, more diverse groups. Approval for clinical use would take more time and evidence.

Study Details

Study typeCohort
EvidenceLevel 3
PublishedApr 2026
View Original Abstract ↓
Methods: DigiCog is a single-center cross-sectional study conducted within the Luxembourgish Predi-COVID cohort (NCT04380987). Participants aged 25-65 years, with and without persistent COVID-19 symptoms, are invited to participate. Cognitive assessments are performed during face-to-face sessions by trained nurses and neuropsychologists using both the VMTech device and standardized neuropsychological tests. Additional data on PCC symptom status, CR, sociodemographic characteristics, fatigue, and psychological factors are also collected. Agreement between digital and standard cognitive assessments will be evaluated using Cohen's kappa coefficient, with sensitivity, specificity, and receiver operating characteristic analyses as secondary measures. Cognitive performance will be compared between participants with and without PCC, and associations with CR proxies will be explored.
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