Clark and colleagues (Clark, 1969; Clark & Yang, 1972) found that participants reported less pain when treated with acupuncture even though there was no difference in d΄ between the treatment (acupuncture) and control (no acupuncture) conditions. This suggests that

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The finding suggests that acupuncture influenced participants' decision criterion for reporting pain, making them less likely to report pain, rather than affecting their actual sensitivity to pain. This is because there was no difference in d΄ (a measure of sensitivity) between conditions, but a difference in reported pain.

Clark and Colleagues (Clark, 1969; Clark & Yang, 1972) Found