The Role of Intelligence in Cognitive Test Scores

In chapter four, we look at genetics and environment. The best studies I could find there showed that with regard to twin data sets, it looked like a genetic factors contributed some of the variation in people's cognitive test scores. In chapter five, I'll look at whether smarter people are faster on very simple things like reaction time, devices and inspection time,. And do we understand it? No, no, yeah, it's that is had that.