Abstract
Jensen has reported a series of reaction-time studies which lead him to conclude that various parameters correlate significantly with IQ. Certain of these parameters are especially emphasized because of their theoretical background and the resulting theoretical light they shed upon the nature of intelligence. Two of the lime-lighted parameters are slope of RT across set size and increasing correlations of RT with IQ as set size increases. I review these studies in detail. I conclude that Jensen's claims are unwarranted. There are many difficulties in his approach that cover the entire gamut from method to data to theory. Some original reseach of my own is reported to illustrate the methodological problems with Jensen's procedure. The data that he alludes to often do not support his claims. The theory that he applies does not fit his paradigm. My conclusion: such research is not easy.
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