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Related Experiment Videos

Changes in the palmar sweat index during mental arithmetic.

T Köhler1, U Troester

  • 1Psychologisches Institut III, University of Hamburg, Germany.

Biological Psychology
|October 1, 1991
PubMed
Summary

Mental stress significantly increases active sweat glands, measured by the palmar sweat index (PSI). Initial measurements may be affected by the assessment procedure itself, requiring several readings for accurate baseline data.

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Area of Science:

  • Physiology
  • Psychophysiology

Background:

  • The palmar sweat index (PSI) quantifies active sweat gland output.
  • Understanding sweat gland response to activation is crucial for psychophysiological research.

Purpose of the Study:

  • To investigate the influence of mental activation on the number of active sweat glands (PSI).
  • To examine the relationship between PSI and electrodermal activity (skin conductance level, spontaneous fluctuations) and heart rate.

Main Methods:

  • Fifty male students participated, divided into two groups.
  • The plastic impression method was used to assess PSI.
  • Physiological measures including skin conductance level (SCL), number of spontaneous fluctuations (SF), and heart rate (HR) were recorded during adaptation, relaxation, and mental arithmetic phases.

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Main Results:

  • PSI significantly increased during mental arithmetic (activation) and decreased during subsequent relaxation.
  • PSI values differed between groups during specific activation phases, indicating differential responses.
  • Initial PSI measurements showed a decrease, suggesting habituation to the assessment procedure and the need for baseline stabilization.

Conclusions:

  • Mental activation demonstrably influences the number of active sweat glands.
  • Electrodermal variables and heart rate correlate highly with PSI within subjects.
  • Careful consideration of baseline measurements is necessary for accurate PSI assessment in psychophysiological studies.