Using PET scans, researchers discovered that both the injection of a placebo solution and the injection of an actual opioid painkiller activated the same brain area, called the anterior cingulate cortex, which is known to contain opioid receptors.

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This is a known fact among researchers, that both the injection of a placebo solution and an actual opioid painkiller activate the same brain area containing opioid receptors, known as the anterior cingulate cortex, as observed through PET scans.

Using PET Scans, Researchers Discovered That Both the Injection of a Placebo