> Culturally we may want to imagine intelligence as something constant and innate to somebody’s soul, but in reality it’s innate to a fragile and fickle organ inside your skull.

Which is also my issue with IQ tests and the relationship of the tests and what they measure. But that changes nothing: IQ tests are not supposed to measure _that_ variability of when you get sick. Or you wake up. Or you are drunk. It makes no sense to use a psychometric test completely out of the context of which it was validated and meant to be used, because then the results are not interpretable. People with that kind of post-covid syndrom have an illness and experience cognitive deficits because of that, but using IQ to measure intelligence in that case when what you actually (want to) measure is brain fog is absurd. That should require a brain fog screening, not an IQ test.