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Related Experiment Videos

Sensory discrimination and intelligence: testing Spearman's other hypothesis.

Ian J Deary1, P Joseph Bell, Andrew J Bell

  • 1Department of Psychology, University of Edinburgh, Scotland. i.deary@ed.ac.uk

The American Journal of Psychology
|April 3, 2004
PubMed
Summary

Spearman's general intelligence and general sensory discrimination hypothesis is supported, showing a strong .92 correlation in schoolchildren. This confirms a century-old idea linking cognitive ability and sensory perception.

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Area of Science:

  • Psychology
  • Cognitive Science
  • Psychometrics

Background:

  • Charles Spearman's 1904 article proposed a general intelligence factor.
  • A less-known hypothesis suggested a link between general intelligence and general sensory discrimination.
  • Previous studies have not directly tested this secondary hypothesis.

Purpose of the Study:

  • To directly investigate Spearman's hypothesis on general intelligence and general sensory discrimination.
  • To replicate Spearman's findings using a contemporary sample of schoolchildren.
  • To reanalyze existing data to further assess the proposed association.

Main Methods:

  • Structural equation modeling was employed to analyze new data from schoolchildren.
  • A reanalysis of previously published data by Acton and Schroeder (2001) was conducted.

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  • The study focused on correlating measures of psychometric intelligence with sensory discrimination abilities.

    • Main Results:

    • A high correlation of .92 was found between general intelligence and general discrimination in the primary sample.
    • Reanalysis of Acton and Schroeder's data revealed a correlation of .68 between general intelligence and general sensory ability.
    • These findings provide significant support for Spearman's less-known hypothesis.

    Conclusions:

    • Spearman's hypothesis on the correspondence between general intelligence and general sensory discrimination receives empirical confirmation.
    • The strong association suggests a fundamental link between cognitive abilities and sensory processing.
    • Further research is needed to replicate and elucidate the mechanisms behind this relationship.