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The significance for intelligence of differences in birth‐weight and health within monozygotic twin pairs
Author(s) -
Marsh R. W.
Publication year - 1980
Publication title -
british journal of psychology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.536
H-Index - 92
eISSN - 2044-8295
pISSN - 0007-1269
DOI - 10.1111/j.2044-8295.1980.tb02730.x
Subject(s) - psychology , variance (accounting) , developmental psychology , argument (complex analysis) , range (aeronautics) , endocrinology , biology , materials science , accounting , business , composite material
This paper presents further evidence to demonstrate the existence of intra‐uterine effects within the normal range of intelligence. The argument is then extended further to estimate the effects of organic factors in the environment that are also pathogenic for intelligence. The combination of these and intra‐uterine effects is found to be a substantial part of the variance associated with environmental factors. Various implications of these factors are discussed.