The Primary Mental Ability

  • Lloyd G. Humphreys
Part of the NATO Conference Series book series (NATOCS, volume 14)


My intent in this paper is to bring up to date a discussion of correlational models in intelligence which I started in the American Psychologist in 1962 to provide data concerning the importance of general intelligence, and in the end to renew my support for the approach to definition and theory of Godfrey Thomson (1919).


General Factor Item Type Intelligence Test General Intelligence Order Factor 
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Copyright information

© Plenum Press, New York 1981

Authors and Affiliations

  • Lloyd G. Humphreys
    • 1
  1. 1.University of IllinoisChampaignUSA

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