The Fallacy of IQ Obsessiveness

The Intelligence Quotient (IQ) — as measured by empirically studied and generally accepted tests (most commonly the Wechsler Adult Intelligence Scale or the Wechsler Intelligence Scale for Children) — is one of the most predictive psychometrics available. In psychological jargon we would say that bona fide IQ tests have predictive validity.

Nevertheless, we cannot say that IQ tests have construct validity — that is, we do not know that they truly measure “intelligence”, because we do not have an agreed upon theory or definition of intelligence.

What we can say is that IQ is positively correlated with success in other academic domains, academics in general — and to a lesser degree, with occupational placement in cognitively challenging fields, life expectancy, and income. It would therefore be more fitting to refer to IQ as an academic / life “success” quotient (where success is very narrowly defined).

One could argue that success in academics, or at least the ability to be successful in academics, is a necessary condition for our most intersubjective definitions of intelligence, however, there are flaws with this argument.

To be brief, the biggest flaw with the above argument is that intelligence is a multidimensional and amorphous concept. Even our intersubjective definitions may be missing something that is fundamental to a philosophically sophisticated definition of intelligence.