Psychophysiology and the Measurement of Intelligence

  • H. J. Eysenck
  • P. Barrett
Part of the Perspectives on Individual Differences book series (PIDF)


Any discussion of the measurement of intelligence is likely to be handicapped by the many different meanings the term has assumed in psychology, to say nothing of popular discourse. It is useful to distinguish the three major meanings of the term, which are shown in Figure 1. Intelligence A is the genotypic, biological underlay of all cognitive activities, responsible for individual differences in the ability to perform cognitive tasks. Intelligence B is the expression of this ability in everyday life, heavily contaminated, of course, by educational, cultural, and socioeconomic factors, as well as by personality and the many accidental features that distinguish one person’s life from that of another. Intelligence C is psychometric intelligence, that is, the intelligence that is measured by tests of one kind or another.


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Copyright information

© Plenum Press, New York 1985

Authors and Affiliations

  • H. J. Eysenck
    • 1
  • P. Barrett
    • 1
  1. 1.Institute of PsychiatryUniversity of LondonLondonEngland

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