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Autonomic nervous system balance and introversion

D Lester1, D Berry

  • 1Psychology Program, Richard Stockton College of New Jersey, Pomona 08240-0195, USA.

Perceptual and Motor Skills
|January 13, 1999
PubMed
Summary

Parasympathetic nervous system activity, indicating a calm autonomic system, was linked to introverted personality traits in a study of 61 college students. This finding supports earlier theories on the physiological basis of introversion.

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Area of Science:

  • Psychophysiology
  • Personality Psychology
  • Autonomic Nervous System Research

Background:

  • The autonomic nervous system (ANS) regulates involuntary bodily functions and has two main branches: the sympathetic (fight-or-flight) and parasympathetic (rest-and-digest).
  • Individual differences in ANS activity, such as parasympathetic predominance, may correlate with distinct personality characteristics.
  • Previous research, including Lester (1974), has proposed links between autonomic functioning and introversion.

Purpose of the Study:

  • To investigate the association between parasympathetic nervous system activity and introversion in a sample of undergraduate students.
  • To empirically test the hypothesis that a greater degree of parasympathetic predominance correlates with introverted personality traits.

Main Methods:

  • A sample of 61 undergraduate students was recruited for the study.
  • A measure was used to assess parasympathetic predominance within the autonomic nervous system.
  • Participants' personality traits, specifically introversion, were evaluated.

Main Results:

  • A statistically significant association was found between parasympathetic predominance and introversion.
  • Students exhibiting a higher degree of parasympathetic activity were more likely to score as introverted.
  • The observed association aligned with predictions made by Lester (1974).

Conclusions:

  • Parasympathetic nervous system activity is demonstrably linked to introverted personality traits in young adults.
  • This study provides empirical support for the psychophysiological underpinnings of introversion.
  • Findings contribute to a deeper understanding of the biological correlates of personality differences.

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