However, considering the SPM alone over its entire age range, there was a net slowing down of the Flynn effect (0.15 points per year for 1979-2008 vs. 0.23 points per year for 1938-1979), because at the highest ages tested the Flynn effect went into reverse (a 1.9 point IQ drop from 1979 to 2008 for 14- & 15-year-olds). Presumably it's this data that suggested a reversal of the UK Flynn effect to you, and your inference differed from Flynn's because the two of you looked at different slices of the data. Flynn focused on younger children, who have rising IQs, and you remembered the data from older children, who have falling IQs. (It's a shame there are no recent adult data to resolve which trend the grown-ups are following.)
Hm, maybe I'm missing something on how the tests interact, but if the older range up to 2008 on the SPM was falling, doesn't that tell you how the adults are going to turn out simply because they are closer to being adults than the younger counterparts?
(Guess I'll have to read his book eventually.)
Hm, maybe I'm missing something on how the tests interact, but if the older range up to 2008 on the SPM was falling, doesn't that tell you how the adults are going to turn out simply because they are closer to being adults than the younger counterparts?
A priori, it does seem like the older kid trend should be more relevant to adults than the younger kid trend.
However, British IQ gains might have a V-shaped relationship with age: solid gains in younger kids, lesser gains (or indeed losses) in teenagers, and a return to higher gains in adulthood. As writt...
From Gene Expression by Razib Khan who some of you may also know from the old gnxp site or perhaps from his BHTV debate with Eliezer.
Link to original post.