Flynn Effect 1: Empirical Puzzle Linda S. Gottfredson, PhD School of Education University of Delaware Newark, DE 19716 Schelling Symposium, “What is Intelligence?,”

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Presentation transcript:

Flynn Effect 1: Empirical Puzzle Linda S. Gottfredson, PhD School of Education University of Delaware Newark, DE Schelling Symposium, “What is Intelligence?,” University of Maryland, November 19, 2007

3 premature claims—they don’t fit the full pattern of evidence IQ rise = rise in general intelligence (general learning & reasoning ability, or g) IQ rise caused by cultural change (donning “scientific spectacles”) IQ rise cannot be genetic

IQ: IQ tests don’t measure level or amount of anything IQ = deviation score (standing within age group) IQ score has no intrinsic meaning z: Ravens Raw score Age1st15th50th85th99th x x Example of Flynn effect—13-year-olds now score like 16-year-olds once 5 more items correct =15 IQ points

Some subtests increase, others not No necessary effect on positive manifold (g) No necessary effect on heritability No paradox IQ: z: raw : 15th50th85th99th Arithmetic Similarities Vocabulary Information Coding %ile IQ scores have risen a lot, but has general intelligence?

Sample IQ Items—Manifest Content Irrelevant to g EasyModerateHard Fill in the next two numbers 3, 5, 7, 9,__, __3, 5, 6, 8, 9, __, __10, 9, 8, 9, 8, 7, __, __ Name one similarity orange—banana (93%) table-chair (55%) Praise-punishment (25%) Define the word conceal (87%) reluctant (50%) ominous (20%) % = % of year-olds getting at least partial credit for answer, WAIS, 1955 Infer the rule More abstract Complexity is the active ingredient: More complex tasks are more “g loaded”

IQ increases strictly cultural? Trends in height mirror trends in IQ Height trend (and paradoxes) cannot be explained by:  Wearing scientific spectacles  Individual multiplier (any genetic advantage triggers environmental ratcheting of all)  Social multipliers (group means influence growth) Biology cannot be ruled out for IQ trends

IQ/height trends strictly non- genetic? Many claims, but little evidence Family studies (showing high heritability, no shared effects) cannot be divorced from Flynn effect Cultural diffusion is not regular, uniform, pervasive Are gains within or just between families?  Heterosis predicts none within families O O O O O O O O O O O O OO O O O Sibships or cousins Current hypotheses interesting, but causal mechanisms vague & post hoc

Thank you