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Brain scans reveal widespread structural and functional changes in patients following COVID-19 infection (www.psypost.org)
submitted 1 month ago by to c/science@lemmy.world
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[–] 20 points 1 month ago (5 children)

Because they compared them to the brains of healthy people, which while they have variation, have enough similarity to establish a baseline and recognize abnormality.

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  • [+] -10 points 1 month ago (4 children)

    but like everyone had covid. so you compare people with dysfunction with people feeling healthy but both had covid.

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  • [–] 35 points 1 month ago

    Not everyone has had COVID and there are antibody markers that only show up with exposure to the virus itself. I think the estimate is around 20% of the population was never infected.

    But we also just have brain scans from before the pandemic.

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