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A NUTRITION THEORY OF THE SECULAR INCREASES IN INTELLIGENCE; POSITIVE CORRELATIONS BETWEEN HEIGHT, HEAD SIZE AND IQ
Author(s) -
LYNN RICHARD
Publication year - 1989
Publication title -
british journal of educational psychology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.557
H-Index - 95
eISSN - 2044-8279
pISSN - 0007-0998
DOI - 10.1111/j.2044-8279.1989.tb03112.x
Subject(s) - secular variation , psychology , correlation , intelligence quotient , standard deviation , positive correlation , statistics , demography , cognition , mathematics , sociology , geometry , medicine , neuroscience
S ummary . The thesis is advanced that the secular increases in intelligence over the last half century are largely due to improvements in nutrition. These have brought about increases in height, head size and brain size of approximately one standard deviation, about the same magnitude of increase as has taken place in intelligence. The thesis requires the existence of a positive correlation between head size and intelligence. Data for 310 9–10 year‐olds obtained a correlation of +0·21.