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Related Experiment Videos

Factor analysis and the cerebral hemispheres: pilot study and parietal functions.

D B Boles1

  • 1Department of Psychology, Rensselaer Polytechnic Institute, Troy, NY 12180.

Neuropsychologia
|January 1, 1991
PubMed
Summary

Factor analysis of behavioral asymmetries reveals seven distinct lateralized functions. Intercorrelations suggest shared processing, particularly in the perisylvian region, challenging simple models of brain lateralization.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Behavioral Genetics

Background:

  • Hemispheric processing research often yields unsatisfactory dichotomies.
  • Factor analysis offers a novel approach to understanding behavioral asymmetries.
  • Identifying common functions and individual differences in lateralization is crucial.

Purpose of the Study:

  • To investigate the utility of factor analysis for behavioral asymmetries.
  • To identify distinct lateralized functions and their interrelationships.
  • To test models of individual differences in brain lateralization.

Main Methods:

  • Factor analysis applied to behavioral asymmetry data from three studies (N=29, N=70, N=60).
  • Experiments focused on tasks stressing parietal lobe function.

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  • Analysis of correlations between identified lateralized functions.

    • Main Results:

    • Seven lateralized functions were identified: auditory lexical, spatial attentive, spatial positional, spatial quantitative, tactile figural, visual emotional, and visual lexical.
    • A diverse pattern of correlations (positive, negative, null) was observed between functions.
    • Significant intercorrelations among functions in the perisylvian region (Brodmann areas 22 and 39) were found.

    Conclusions:

    • Factor analysis is a viable method for studying behavioral asymmetries and lateralized functions.
    • Findings challenge simplistic models of lateralization strength, hemisphericity, and independence.
    • Observed intercorrelations support the Geschwind and Galaburda neurodevelopment theory regarding perisylvian region function.