Previous COVID infection linked to lower brain oxygen levels, cognitive problems: study
Canadian study: participants who previously had COVID-19 performed worse on 2 specific cognitive tasks, and brain imaging showed that during these tasks, there was a lack of oxygen reaching sections of the brain that would normally be fully engaged.
Long COVID Linked to Lower Brain Oxygen Levels, Cognitive Problems and Psychiatric Symptoms - Neuroscience News
"Long COVID is linked to reduced oxygen uptake in the brain, a new study reports...finding is significant as a lack of sufficient oxygen supply may be one of the mechanisms that cause brain fog, cognitive problems...depression and anxiety"