RationalWiki's 2018 Fundraiser

There is no RationalWiki without you. We are a small non-profit with no staff — we are hundreds of volunteers who document pseudoscience and crankery around the world every day. We will never allow ads because we must remain independent. We cannot rely on big donors with corresponding big agendas. We are not the largest website around, but we believe we play an important role in defending truth and objectivity.

If everyone seeing this today donates $5, we will meet our goal for 2018.

Fighting pseudoscience isn't free.
We are 100% user-supported! Help and donate $5, $20 or whatever you can today with PayPal Logo.png!

Donations so far: $3630Goal: $5000

IQ

From RationalWiki
Jump to: navigation, search
Tell me about
your mother

Psychology
Icon psychology.svg
For our next session...
Popping into your mind
I have no idea. People who boast about their I.Q. are losers.
Stephen Hawking, when asked about his IQ[1]

IQ (intelligence quotient) is a psychometric method considered to measure general intelligence (or g) and derived from the fact that various tests of cognitive ability tend to have highly correlated scores for an individual. The correlations are due to a hypothesised general factor of intelligence or g. IQ correlates with educational achievement and job performance (with a coefficient of 0.7 - 0.8[2]), but is only predictive of these traits within certain values of IQ. Since IQ is simply a score, it is inaccurate to claim that one "has" a high IQ or a low IQ, when it more or less means "scored high" and "scored low". The use of IQ as a measure for intelligence enjoys widespread acceptance in modern academic psychology.

Criticism[edit]

IQ has been criticised for only measuring some sorts of intelligence[3] and for being inadequate in that it unfairly emphasises certain types of abstract problem solving (ones which are not exactly common pastimes in poorer parts of the world). This perception has probably been reinforced by common tropes in movies and books of high IQ characters who have little "street smarts", or who possess little "common sense".

Such criticism is poorly informed, and misunderstands the nature of IQ testing.[citation needed] It is theorised that the reason abstract problem solving has the highest g-loading (or correlation with IQ) is because it is an unpracticed skill[citation needed], and therefore most likely to be tapping into a person's latent ability to learn and adapt rather than previously learned test-taking strategies. To illustrate, one would expect an accountant to score higher in a numerical test than a speech pathologist, and vice versa in a verbal or reading comprehension test. These differences in score reflect learned strategies rather than underlying differences in intelligence. Using abstract tests typically nullifies these effects. In any case, IQ is never determined from the result of one type of test, but of a battery of tests that measure across multiple domains.

Another issue is that it is a normalised measure, calibrated to have 100 as the average and 68% of people in the 86-115 range. So an IQ of 140 measured now is not the same as an IQ of 140 measured 10 years ago and yes, by this measure people are getting more intelligent. It was never designed to be an absolute measure. Groups that boast about their high IQ generally don't retest their members periodically, presumably to avoid the embarrassment of having to cashier one of their members every now and again.

Testing outside of a formal environment for bragging rights should probably be looked on as something of a scam. Fun for bragging on social media, but little else. Paying for IQ tests means that, by definition, you have an IQ below 100. Don't do it, but if you must, never own up to it.

Importantly, most adult skills heavily depend on what is called crystallized intelligence, the ability to tune one's intellectual ability towards solving particular kinds of problems, rather than fluid intelligence, the kind of broad analytical ability that IQ is intended to measure. This is not a failing of IQ as a measure of intelligence, but certainly something that people who place a lot of stock in the concept tend to gloss over.

Heritability[edit]

Though numerous familial and twin studies have found strong heritability correlations to IQ, all attempts to find direct genetic relationships that drive IQ scores have failed to deliver on the expectations of that heritability [4][5]. This "heritability paradox" has some explanations with serious academic weight, such as by epigeneticWikipedia's W.svg characteristics,[4] such as imprinting, which can be passed from parent to child without any permanent multi-generational genes attached, and common developmental factors such as nutrition and prenatal hormone exposure.

See also[edit]

References[edit]