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Relationships among multiple task asymmetries. II. A large-sample factor analysis

D B Boles1

  • 1Department of Philosophy, Psychology, and Cognitive Science, Rensselaer Polytechnic Institute, Troy, NY 21280, USA. bolesd@rpi.edu

Brain and Cognition
|July 2, 1998
PubMed
Summary

This study analyzed lateralized task asymmetry, finding no global relationship between measures. Evidence suggests localized brain processes, not a single determinant, underlie these differences.

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Area of Science:

  • Cognitive Neuroscience
  • Psychology
  • Psychometrics

Background:

  • Lateralized tasks are used to study brain asymmetry.
  • Previous research on task asymmetry has yielded mixed results.
  • Combining data offers a larger sample for robust analysis.

Purpose of the Study:

  • To perform a large-sample factor analysis on multiple measures of task asymmetry.
  • To investigate the global and local structure of lateral difference measures.
  • To explore the underlying hemispheric processes and determinants of perceptual asymmetry.

Main Methods:

  • Combined data from published and unpublished factor analytic studies.
  • Included 10 measures from 9 lateralized tasks with significant asymmetry and reliability.

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  • Utilized correlational matrix, factor extraction, oblique rotation, and principal-components analysis.

    • Main Results:

    • Found significant positive and negative correlations between measures.
    • No global relationship or single component emerged from factor analysis.
    • Evidence for local structure in lateral difference measures was observed.

    Conclusions:

    • Results support the concept of dissociable hemispheric processes.
    • Suggests modality-specific perceptual asymmetry and multiple determinants.
    • Challenges the notion of a single underlying factor for lateral differences.