I always felt like my IQ had dropped significantly when I had a cold, as mental tasks were much harder. Also assumed that everyone else felt the same. See also

I always felt like my IQ had dropped significantly when I had a cold, as mental tasks were much harder. Also assumed that everyone else felt the same. See also https://www.sciencedirect.com/science/article/pii/S0889159112001547 https://www.sciencedirect.com/science/article/pii/S088915911... for some research.