The threshold of pain is the point at which pain begins to be felt. It is an entirely subjective phenomenon. The intensity at which a stimulus (e.g., heat, pressure) begins to evoke pain is the threshold intensity. So, if a hotplate on a person's skin begins to hurt at 42°C (107°F), then that is the pain threshold temperature for that bit of skin at that time. 42°C is not the pain threshold, it is the temperature at which the pain threshold was crossed.
The intensity at which a stimulus begins to evoke pain varies from individual to individual and for a given individual over time.
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Famous quotes containing the words threshold of, threshold and/or pain:
“I am admonished in many ways that time is pushing me inexorably along. I am approaching the threshold of age; in 1977 I shall be 142. This is no time to be flitting about the earth. I must cease from the activities proper to youth and begin to take on the dignities and gravities and inertia proper to that season of honorable senility which is on its way.”
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—William Shakespeare (1564–1616)