Highlights
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Simple reaction time has slowed since 1889.
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Simple reaction time genetically correlates with g.
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Psychometric meta-analysis reveals a decline in g of − 1.23 points per decade.
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The decline between 1889 and 2004 is − 14.1 points.
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This is the first direct measurement of a probable dysgenic trend in IQ.
While I think this is certainly
possible, I also think that it is entirely possible that this only LOOSELY correlates with measures of IQ other than processing speed.
And a look at their data suggests that it's not exactly robust, this effect. {ahem}
