Just one g: Consistent results from three test batteries

Wendy Johnson, Thomas J. Bouchard, Robert F. Krueger, Matt McGue, Irving I. Gottesman

Research output: Contribution to journalArticlepeer-review

177 Scopus citations


The concept of a general intelligence factor or g is controversial in psychology. Although the controversy swirls at many levels, one of the most important involves g's identification and measurement in a group of individuals. If g is actually predictive of a range of intellectual performances, the factor identified in one battery of mental ability tests should be closely related to that identified in another dissimilar aggregation of abilities. We addressed the extent to which this prediction was true using three mental ability batteries administered to a heterogeneous sample of 436 adults. Though the particular tasks used in the batteries reflected varying conceptions of the range of human intellectual performance, the g factors identified by the batteries were completely correlated (correlations were .99, .99, and 1.00). This provides further evidence for the existence of a higher-level g factor and suggests that its measurement is not dependent on the use of specific mental ability tasks.

Original languageEnglish (US)
Pages (from-to)95-107
Number of pages13
Issue number1
StatePublished - 2004


  • General intelligence
  • Intelligence assessment
  • Mental ability battery
  • g factor


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