The ultimate goal of pain research is to provide effective routes for pain relief. Nevertheless, the perception pain relief as a change in pain intensity and un-/pleasantness has only been rarely investigated. It has been demonstrated that pain relief has rewarding and reinforcing properties, but it remains unknown whether the perception of pain relief changes when pain reductions occur repeatedly. Further, it remains an open question whether the perception of pain relief depends on the controllability of the preceding pain.

中文翻译：

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对可控制和不可控制的疼痛反复疼痛缓解的感知

疼痛研究的最终目标是为缓解疼痛提供有效途径。然而，很少研究将疼痛缓解作为疼痛强度和不愉快/不愉快的变化。已经证明，疼痛缓解具有有益和强化的特性，但当疼痛减轻反复发生时，疼痛缓解的感知是否会发生变化仍然未知。此外，疼痛缓解的感觉是否取决于先前疼痛的可控性仍然是一个悬而未决的问题。