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Several thresholds have been studied and estimated. These studies indicate that individuals differ in the level of artificially-induced negative stimulation that they consider painful. What does this actually tell us about pain and individual differences? Are we observing differences in subjective experience, or are we observing differences in the personal concept of where "pain" begins?
...there are several thresholds related to pain and it is important to distinguish among them. Typically, thresholds are measured by applying a stimulus such as electric shock or radiant heat to a small area of skin and gradually increasing the intensity.Four thresholds can be measured by this technique: (a) sensation t....
Melzack, R. and Wall, P. D., "The Challenge of Pain (Reprint of 1988 edition)", Penguin Books, 2008, 17
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