Does cognitive performance in older adults differ according to whether it is assessed pre- or post- MRI scan in UK Biobank?

Our results suggest that whether cognition is assessed pre- or post- MRI scan for UK Biobank participants may not have a meaningful impact on mean cognitive test scores at the group level, although unmeasured factors such as test-related anxiety or postprandial effects could be the subject of future investigations for their role in cognitive test performance at the population level.