>>20446746No, they're not. The average of results on IQ tests have been constantly improving over time since they were introduced, and the mean constantly has to be adjusted to account for that. IQ tests are far from definitive summations of general intelligence, but (a) they're the go to in G-Reco threads to fob off anyone who doesn't like, realize and/or understand a thing so it feels appropriate to use it, and (b) it's one of the few quantitive standards we have for intelligence, imperfect as it may be.
What may be true is that attention span is growing shorter, but even that's debatable. More realistically, what's happening is that people are off-loading more of their thought processes and memory to computer devices that can do those things, and instead devoting that brain capacity to other things instead. This has always been an issue though, and the same complaints re: intelligence/attention can be found in ancient Greek scrolls because of the invention of writing. Including that using it instead of just remembering things is making people dumb.