Happy Tuesday, this edition includes IQ issues that are impacting you locally and more meta considerations.
Mainstream Science on Intelligence as published in the Wall Street Journal 1994 and signed by experts in intelligence and allied fields.
Court OKs Barring High IQs for Cops delves into a case in NJ that mimics the challenges of potential Law Enforcement across the US. This is policy in play now. Do you agree with it?
Jordan, a 49-year-old college graduate, took the exam in 1996 and scored 33 points, the equivalent of an IQ of 125. But New London police interviewed only candidates who scored 20 to 27, on the theory that those who scored too high could get bored with police work and leave soon after undergoing costly training.
"Has humanity reached ‘peak intelligence’?" may help you understand how to frame the Flynn effect - the measurable difference in IQ generation to generation.
If you look at Finland, Norway and Denmark, for instance, the turning point appears to have occurred in the mid-90s, after which average IQs dropped by around 0.2 points a year. That would amount to a seven-point difference between generations.
You might assume that the more intelligent you are, the more rational you are, but it’s not quite this simple.
In the same sample of 3,154 pairs of 12-year-old twins, we directly compared twin-study heritability estimates for cognitive abilities (language, verbal, nonverbal, and general) with GCTA estimates captured by 1.7 million DNA markers. We found that DNA markers tagged by the array accounted for .66 of the estimated heritability, reaffirming that cognitive abilities are heritable.
"The movement that's trying to get rid of IQ tests is failing to understand that these tests are valid in the hands of a competent practitioner who can go beyond the numbers--or at least use the numbers to understand what makes the person tick, to integrate those test scores with the kind of child you're looking at, and to blend those behaviors with the scores to make useful recommendations," he says.
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