Family configuration and intelligence.

An attempt is made to show generally that variations in aggregate intelligence scores are closely associated with variations in patterns of family configuration and that these aggregate family factors are deeply implicated in the declining Scholastic Aptitude Test (SAT) scores the discussion summarizes a recent theoretical analysis that specifies the conditions under which family configuration may foster or impede intellectual growth and examines some relevant empirical findings finally returning to the special case of the SATs. A variety of findings reveal the impact of family configuration on intelligence: intellectual performance increases with decreasing family size; children born early in the sibship perform births are relatively short; long intersibling spacing appears to cancel the negative effects of birth order and in extreme cases to reverse them; in general long intervals enhance intellectual growth; the adverse effects of short intervals are reflected in the typically low intelligence quotients (IQs) of children of multiple births; only children the benefits of a small family are apparently counteracted by the lack of opportunities to serve as teachers to younger children; last children suffer that handicap also; temporal changes in family patterns such as birthrates average orders of births intervals between children and family size are reflected in temporal changes in aggregate measures of intellectual performance; and males and females differ in average birth order and this difference is reflected in aggregate intellectual performance scores. The pattern of these diverse data is consistent with the analysis of intellectual development based on the confluence model. Not all variation in intelligence is accounted for by variation in family configuration. For example the large decline in SAT Scores in the US cannot be a function of changes in family configuration alone because it is considerably larger that would be expected on the basis of a simple extrapolation from the four national samples.

[1]  E. E. Lessing,et al.  Wisc Subtest and IQ Score Correlates of Father Absence , 1970 .

[2]  M. Appelbaum,et al.  Developmental changes in mental performance. , 1973, Monographs of the Society for Research in Child Development.

[3]  Lillian Belmont,et al.  Birth Order, Family Size, and Intelligence , 1973, Science.

[4]  R. Farley,et al.  Family Stability: A Comparison of Trends Between Blacks and Whites , 1971 .

[5]  L. Cronbach.  Five Decades of Public Controversy over Mental Testing. , 1975 .

[6]  David Wechsler,et al.  Intelligence Defined and Undefined: A Relativistic Appraisal. , 1975 .

[7]  B. Sutton-Smith,et al.  Sibling age spacing effects upon cognition. , 1969 .

[8]  S Scarr-Salapatek,et al.  Race, social class, and IQ. , 1971, Science.

[9]  B. Rosenberg,et al.  The effect of limited father absence on cogniive development. , 1969, Child development.

[10]  H. Biller,et al.  Father availability and academic performance among third-grade boys. , 1971 .

[11]  T. Mckeown,et al.  An investigation of the difference in measured intelligence between twins and single births * , 1970, Annals of human genetics.

[12]  W. D. Altus.  BIRTH ORDER AND SCHOLASTIC APTITUDE. , 1965, Journal of consulting psychology.

[13]  L. Jarvik,et al.  Genetics and Intelligence: A Review , 1963, Science.

[14]  S. Schachter.  BIRTH ORDER, EMINENCE AND HIGHER EDUCATION * , 1963 .

[15]  D. Layzer.  Heritability Analyses of IQ Scores: Science or Numerology? , 1974, Science.

[16]  F. Craik,et al.  Levels of Pro-cessing: A Framework for Memory Research , 1975 .

[17]  H. Breland.  Birth Order, Family Configuration and Verbal Achievement. , 1974 .

[18]  V. Cicirelli.  Sibling constellation, creativity, IQ, and academic achievement. , 1967, Child development.

[19]  J. Hirsch.  Jensenism: The Bankruptcy of “Science” Without Scholarship , 1975 .

[20]  R. Gelman,et al.  The development of communication skills: modifications in the speech of young children as a function of listener. , 1973, Monographs of the Society for Research in Child Development.

[21]  C. Schooler.  Birth order effects: not here, not now. , 1972, Psychological bulletin.

[22]  P. Urbach.  Progress and Degeneration in the ‘IQ Debate’ (II) , 1974, The British Journal for the Philosophy of Science.

[23]  G. Wyshak.  Intervals between births in families containing one set of twins , 1969, Journal of Biosocial Science.

[24]  L. L. Thurstone,et al.  Birth order and intelligence. , 1929 .

[25]  R. Zajonc,et al.  Birth Order and Intellectual Development , 1975 .

[26]  A. Wesman,et al.  Educational Uses of Tests with Disadvantaged Students. , 1975 .

[27]  T. Mckeown,et al.  The relation of measured intelligence to birth order and maternal age * , 1969, Annals of human genetics.

[28]  B. Sutton-Smith,et al.  Father-absence effects in families of different sibling compositions. , 1968, Child development.

[29]  J. Santrock.  Relation of Type and Onset of Father Absence to Cognitive Development. , 1972 .

[30]  C. Burt.  The genetic determination of differences in intelligence: a study of monozygotic twins reared together and apart. , 1966, British journal of psychology.