Abstract
The psychophysical features of the transition from the pure heat to the heat pain range were studied in 25 healthy subjects (mean age 28.8 years). Thirty short heat stimuli from −1.6° C to + 1.6° C relative to the pain threshold were applied to the thenar of the left hand with an apparatus containing a Peltier thermode (nine different temperatures at 0.4°C intervals). The subjects rated the sensation intensity on a visual analogue scale. The resulting stimulus/sensation intensity relations could be explained equally well (same goodness of fit) by a model with a power function (PF) and by a model with two linear regression lines (TLR), one for stimulus intensities below and one for those above the pain threshold and intersecting at the pain threshold. The slopes of the TLR model were significantly larger above the pain threshold than below it. The PF model produced exponents between 1.8 and 1.9. We conclude that to describe the transition area, it is sufficient to use simple linear models for both the pure heat and the heat pain ranges.
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This research was supported by Grant Str 273/3 from the Deutsche Forschungsgemeinschaft.
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Lautenbacher, S., Moltner, A. & Strian, F. Psychophysical features of the transition from pure heat perception to heat pain perception. Perception & Psychophysics 52, 685–690 (1992). https://doi.org/10.3758/BF03211705
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DOI: https://doi.org/10.3758/BF03211705