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A Procedure Results in Pain Relief Without the Use of Naloxone

Question 157

Multiple Choice

A procedure results in pain relief without the use of naloxone, but the procedure is ineffective when naloxone is present, then we have direct evidence that ___________ may be responsible for the reduction in pain.


A) a placebo effect
B) sensory adaptation
C) endorphins
D) an experimenter expectancy effect

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