In the research study reported in the Focus on Neuroscience box, "The Mysterious Placebo Effect," both the actual opioid painkiller and a placebo injection relieved pain in the research participants.

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The study reported in the Focus on Neuroscience box found that both the actual opioid painkiller and a placebo injection relieved pain in the research participants.

In the Research Study Reported in the Focus on Neuroscience