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A multi-method investigation of individual differences in hemisphericity.

P G Nestor1, M A Safer

  • 1Department of Psychology, Catholic University of America, Washington, D.C 20064.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|September 1, 1990
PubMed
Summary

This study explored hemisphericity and personality. While most measures showed no link, a composite index suggested right hemisphericity correlates with expressing emotions, and left hemisphericity with inhibiting them.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Personality Psychology

Background:

  • Hemisphericity theory proposes individuals differ in analytical (left-hemisphere) versus holistic (right-hemisphere) processing.
  • This study examines the relationship between hemisphericity and personality traits, specifically trait anxiety and emotion expression/inhibition.

Purpose of the Study:

  • To investigate the relationship between individual differences in hemisphericity and personality variables.
  • To assess the construct and predictive validity of hemisphericity measures in relation to personality.

Main Methods:

  • Sixty-six right-handed subjects completed personality assessments.
  • Multiple hemisphericity measures were used, including dichotic listening, tachistoscopic emotion recognition, and verbal/spatial abilities.

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  • Tests were conducted on two separate occasions to assess reliability.

    • Main Results:

    • Individual hemisphericity measures showed limited reliability and generally did not correlate with each other or personality measures.
    • A composite hemisphericity index revealed a modest correlation: right hemisphericity with emotion expression and left hemisphericity with emotion inhibition.
    • The study found limited evidence for the construct or predictive validity of hemisphericity.

    Conclusions:

    • The findings suggest a weak association between hemisphericity and personality, particularly regarding emotion regulation.
    • Further research is needed to clarify the construct validity and predictive power of hemisphericity.
    • The study highlights the complexity of brain lateralization and its relationship to individual psychological differences.