> Reaction time reflects a person's mental processing speed, and so is considered an indication of general intelligence. I reject this premise.
The premise you (rightly) reject is misreported -- the actual reason reaction time is being used as a proxy for IQ is that it has been established to have a correlation with IQ, not for the stupid reason reported in the HuffPo article. (Its like whoever wrote that article didn't even read the abstract of the paper its about.) OTOH, I'm not convinced there is enough of an understanding of that correlation (particularl…
An argument against the significance of the correlation is that old people's reaction times decline, while their intelligence may continue to increase. Consequently a test that measured abilities other than reaction time would favor that age group over a test series based on reaction time.