It should be added that the important findings regarding intelligence are among the most replicable and robust in all of behavioral science.— Christopher Chabris (@cfchabris) December 22, 2018
Those two things are important and robust regularities about human cognition and behavior. No single causal factor (that I know of) but many robust genetic causes; predictive compared to what—>better & broader than any other short test of performance or behavior?— Christopher Chabris (@cfchabris) December 22, 2018
The discussion when on and on for awhile, ending up here:
Obviously the second goal is important, but I’m genuinely surprised you don’t think the first goal is also scientific (& important). Figuring out causality requires knowing what exists.— Thom Scott-Phillips (@tscottphillips) December 25, 2018
At which point I offered my two cents:
Since mass affects speed, the whole car is part of the speed system; so is the car's shape. But surely the engine is more important than, say, the passenger seat, no? Yes. We understand the physics and mechanics of cars and so can reason about these things. 2/X— Bill Benzon (@bbenzon) December 27, 2018
The fact that top speed is affected by the whole car doesn't confuse us. But for the mind, we know very little about its physics and mechanics (or its biologics). So we've got this fairly reliable measure, but little to attribute it to. 3/X— Bill Benzon (@bbenzon) December 27, 2018
I then linked to this old blog post, which explains just a bit more: Measurement: IQ and 5 Personality Factors.
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