Research conducted by petrovic, kalso, petersson, and ingvar (2002) found that brain activity changed when patients in pain received

This research showed that brain activity, specifically that in the rostral anterior cingulate cortex, changed when patient received either opioid analgesics or placebos. This investigation of the placebo effect produced evidence that it works through similar neural mechanisms as does the administration of opioids.

Size and shape of continents