Intelligence Quotes

“Thus, they were asking: do higher intelligence test scores from about age 20 predict better educational outcomes, higher social position, and arguably more pro-social behaviours in the thirties? The answer was: they did. They then asked if this was due to (confounded by) parental socio-economic status; it mostly wasn’t.”
― Ian J. Deary, Intelligence: A Very Short Introduction

“Genetic variants related to intelligence appear, therefore, to be associated with health.”
― Ian J. Deary, Intelligence: A Very Short Introduction

“We noticed that the boys’ and girls’ scores were not equally spread. The means were the same. However, the standard deviation for the boys was 14.9, and for the girls it was only 14.1. This difference in spread was statistically significant.”
― Ian J. Deary, Intelligence: A Very Short Introduction

“Because someone else will mention it to you anyway, I will list Stephen Jay Gould’s book (The Mismeasure of Man). It gets the psychometrics wrong, it is wrong on brain size and intelligence, and it is written with strong anti-IQ-testing bias.”
― Ian J. Deary, Intelligence: A Very Short Introduction