For CRT there are mixed results; some correlation remains for the youngest cohort, zero correlation for the 1950s cohort, and a small negative correlation for the 1930s cohort, albeit this has only marginal significance.
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The relationship between intelligence and reaction time varies with age: Results from three representative narrow-age age cohorts at 30, 50 and 69 years.
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In the 1930s cohort the correlation again has the opposite sign, but is not even marginally significant.