Still just 1 g: Consistent results from five test batteries

Wendy Johnson, Jan te Nijenhuis, Thomas J. Bouchard Jr

Research output: Contribution to journalArticlepeer-review


In a recent paper, Johnson, Bouchard, Krueger, McGue, and Gottesman (2004) addressed a long-standing debate in psychology by demonstrating that the g factors derived from three test batteries administered to a single group of individuals were completely correlated. This finding provided evidence for the existence of a unitary higher-level general intelligence construct whose measurement is not dependent on the specific abilities assessed. In the current study we constructively replicated this finding utilizing five test batteries. The replication is important because there were substantial differences in both the sample and the batteries administered from those in the original study. The current sample consisted of 500 Dutch seamen of very similar age and somewhat truncated range of ability. The batteries they completed included many tests of perceptual ability and dexterity, and few verbally oriented tests. With the exception of the g correlations involving the Cattell Culture Fair Test, which consists of just four matrix reasoning tasks of very similar methodology, all of the g correlations were at least .95. The lowest g correlation was .77. We discuss the implications of this finding.
Original languageEnglish
Pages (from-to)81-95
Number of pages15
Issue number1
Early online date17 Jul 2007
Publication statusPublished - Feb 2008


  • g factor
  • Mental ability test battery


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