<\/div>\n<\/td>\n
1%<\/td>\n | 29<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Pathetic. Jensen was right when he wrote:<\/p>\n I had begun by trying, for the sake of scholarly thoroughness, merely to write
\na short chapter for my book on the \u2018culturally disadvantaged\u2019 that I expected
\nwould succinctly review the so-called nature-nurture issue only to easily dismiss
\nit as being of little or no importance for the subsequent study of the causes of
\nscholastic failure and success. I delved into practically all the available literature
\non the genetics of intelligence, beginning with the works of the most prominent
\ninvestigator in this field, Sir Cyril Burt, whom I had previously heard give a
\nbrilliant lecture entitled The Inheritance of Mental Ability\u2019 at University
\nCollege, London in 1957. The more I read in this field, the less convinced I
\nbecame of the prevailing belief in the all-importance of environment and learning
\nas the mechanisms of individual and group differences in general ability and
\nscholastic aptitude. I felt even somewhat resentful of my prior education, that I<\/strong>
\ncould have gone as far as I had\u2014already a fairly well-recognized professor of<\/strong>
\neducational psychology\u2014and yet could have remained so unaware of the crucial<\/strong>
\nimportance of genetic factors for the study of individual differences.<\/strong> It was little
\nconsolation that I had been \u2018in good company\u2019 in my ignorance of genetics; in
\nfact, that aspect of the situation seemed even more alarming to me. I was<\/strong>
\noverwhelmed by the realization of the almost Herculean job that would be<\/strong>
\nneeded to get the majority of psychologists and educators fully to recognize the<\/strong>
\nimportance of genetics for the understanding of variation in psychological traits.<\/strong>
\nHence, rather than attempting at first to add small increments of original
\nempirical research to the body of knowledge on the genetics of human abilities, I
\nthought my most useful role at that point was a primarily didactic one. Most of
\nmy thirty-five articles and four books dealing with genetics are of that nature. But
\nin the course of marshaling the scattered existing research evidence, and trying to
\nmake the most sense of it, I noted certain methodological problems and
\nformulations that called for criticism and reformulation. One was Karl
\nHolzinger\u2019s conceptually muddled index of heritability based on monozygotic
\n(MZ) and dizygotic (DZ) twins, for which I substituted a more defensible
\nformula that comes closer to the theoretical definition of heritability and also
\ntakes account of assortative mating in estimating the heritability of a trait (Jensen,
\n1967). Another was the estimation of the limits of genotype\u00d7environment
\ncovariance in IQ, based on data from MZ and DZ twins (Jensen, 1976b). A
\ntheoretical paper on the possible explanation of race differences and a race\u00d7sex
\ninteraction in spatial ability in terms of sex-linkage of a hypothesized recessive
\ngene that enhances spatial visualization ability (Jensen, 1975a), although an
\ninteresting and plausible theory, has been undercut in recent years by the failure
\nto find consistent evidence for any sex-linkage in the genetic conditioning of
\nspatial ability. My empirical findings in behavior genetics have concerned the
\nheritability of memory span (Jensen and Marisi, 1979) and the effects of
\ninbreeding depression on general ability (Agrawal, Sinha and Jensen, 1984;
\nJensen, 1983b). The study of inbreeding depression seems to me especially
\nimportant in the study of human abilities, because inbreeding depression indicates
\ngenetic dominance, and the presence and degree of dominance are related to
\nnatural selection for the trait in the course of its biological evolution. It was of
\ngreat interest to me to discover, for example, that of the several ability factors
\nthat can be extracted from the various subtests of the Wechsler Intelligence Scale
\nfor Children, the one that shows the greatest susceptibility to inbreeding
\ndepression is the g factor (Jensen, 1983b). This finding indicates that one of our
\nmost widely used standard psychometric tests of intelligence yields scores that
\nreflect some part of the variance in the biological intelligence that has developed
\nin the course of human evolution.<\/p>\nFrom: Modgil, Sohan, and Celia Modgil, eds. Arthur Jensen: Consensus and Controversy<\/em>. Vol. 4. Routledge, 1987.<\/p>\nhttp:\/\/libgen.info\/view.php?id=394524<\/p>\n Last chapter (Jensen’s).<\/p>\n","protected":false},"excerpt":{"rendered":" Data from here: http:\/\/www.goodreads.com\/book\/show\/54218.The_Mismeasure_of_Man No one informed about this subject can give this book more than 2, and it really should only get 1’s for this pathetic performance, even if well-written. However, the rating stats show that: rating frequency % # 5 36% 974 4 39% 1048 3 19% 509 2 3% 100 1 1% […]<\/p>\n","protected":false},"author":17,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1839],"tags":[],"class_list":["post-3916","post","type-post","status-publish","format-standard","hentry","category-psychometics","entry"],"_links":{"self":[{"href":"https:\/\/emilkirkegaard.dk\/en\/wp-json\/wp\/v2\/posts\/3916","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/emilkirkegaard.dk\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/emilkirkegaard.dk\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/emilkirkegaard.dk\/en\/wp-json\/wp\/v2\/users\/17"}],"replies":[{"embeddable":true,"href":"https:\/\/emilkirkegaard.dk\/en\/wp-json\/wp\/v2\/comments?post=3916"}],"version-history":[{"count":1,"href":"https:\/\/emilkirkegaard.dk\/en\/wp-json\/wp\/v2\/posts\/3916\/revisions"}],"predecessor-version":[{"id":3917,"href":"https:\/\/emilkirkegaard.dk\/en\/wp-json\/wp\/v2\/posts\/3916\/revisions\/3917"}],"wp:attachment":[{"href":"https:\/\/emilkirkegaard.dk\/en\/wp-json\/wp\/v2\/media?parent=3916"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/emilkirkegaard.dk\/en\/wp-json\/wp\/v2\/categories?post=3916"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/emilkirkegaard.dk\/en\/wp-json\/wp\/v2\/tags?post=3916"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}} |