Intelligence and the Brain

In short, more intelligent people are better at predicting and reacting to the environment. (Location 174)

In the case of IQ, a person’s score is determined by dividing their Mental Age by their Chronological Age, and then multiplying by 100. (Location 696)

Heritability is used to describe the proportion of observed differences or variation in a particular trait that is due to genetic factors. In other words, what percentage of differences across people are due to the genes.31 (Location 805)