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Thermal testing: normative data and repeatability for various test algorithms

D Yarnitsky1, E Sprecher

  • 1Department of Neurology, Rambam Medical Center, Technion Medical School, Haifa, Israel.

Journal of the Neurological Sciences
|August 1, 1994
PubMed
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This study compared three sensory testing methods for warm and cold sensation. Reaction-time-exclusive methods (levels and staircase) demonstrated better repeatability and less bias than the reaction-time-inclusive method of limits.

Area of Science:

  • Neurology
  • Sensory Physiology
  • Quantitative Sensory Testing

Background:

  • Accurate measurement of sensory thresholds is crucial for diagnosing neurological conditions.
  • Various psychophysical methods exist for assessing thermal sensation, but their comparative reliability is not fully established.

Purpose of the Study:

  • To compare the repeatability and bias of three sensory testing algorithms: method of limits (reaction-time inclusive), and methods of levels and staircase (reaction-time exclusive).
  • To establish normative data for thermal sensory thresholds using these methods.

Main Methods:

  • 106 healthy subjects underwent thermal sensory threshold testing (warm and cold) at the thenar eminence and foot dorsum.
  • Three algorithms were employed: reaction-time inclusive method of limits, and reaction-time exclusive methods of levels and staircase.

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  • Tests were repeated after two weeks, with data analyzed using ANOVA-based procedures to determine repeatability coefficients.

    • Main Results:

    • The reaction-time-exclusive methods of levels and staircase showed no significant inter-session bias.
    • Methods of levels and staircase exhibited better (lower) repeatability coefficients compared to the method of limits.
    • The method of limits demonstrated inter-session bias and larger repeatability coefficients.
    • All tested methods had comparable test durations.

    Conclusions:

    • Reaction-time-exclusive psychophysical methods, specifically levels and staircase, offer a significant advantage over the reaction-time-inclusive method of limits for assessing thermal sensory thresholds.
    • These findings support the use of levels and staircase methods for reliable quantitative sensory testing in clinical and research settings.