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Notably, none of the volunteers reported subjective cognitive deficits. This apparent discrepancy between objective and subjective measures could be interpreted as indicating that the tasks are sensitive enough to detect small changes in cognition that are too subtle for the volunteer to be metacognitively aware of. It is important to note though that this interpretation is limited by the lack of specific questions about lasting changes in cognition–instead, volunteers underwent a structured interview about their overall health. Within the broader literature, larger observational studies have reported mixed results. Subjective symptoms have been reported 36 months post infection,28 which accords with the observation of objectively measured deficits in task performance a year or more post infection with Wildtype virus in our epidemiological research,11 and with the objective measures observed up to the 12 month final timepoint in the present study. However, correlations between objective measures of cognition and subjective assessment of cognition after COVID-19 are modest,29 and hard to confirm, particularly in less severe cases.30 Given that no direct assessment of subjective cognitive symptoms was performed and the sample size was small, the complex interaction between objective cognitive ability and subjective cognition cannot be elucidated in the current study. Relatedly, the clinical relevance of the observed cognitive changes remains unclear.