Thermal detection threshold of the behavioural responses triggered by Aδ- and C-fibre input obtained when the stimulated area is first heated to T₁ = 34°C or T₁ = 38°C during the two seconds preceding the test stimulus (T₂).

<p>The thin grey lines represent the individual thresholds obtained in each participant. The box plots represent the group-level median and interquartile range. Note that the C-fibre threshold is increased for T₁ = 38°C vs. T₁ = 34°C, whereas the Aδ-fibre threshold appears unaffected by the conditioning skin temperature.